思科CCNA第三学期期末考试(完整版!!!)

思科CCNA新版第3学期final-期末考试答案1出于维护目的，已将路由器从网络中移除。

并已将新的 Cisco IOS 软件映 像成功下载到服务器并复制到路由器的闪存中。

应该在进行什么操作后再 将路由器放回网络中运行？备份新的映像。

将运行配置复制到 NVRAM 。

从闪存中删除之前版本的 Cisco IOS 软件。

重新启动路由器并检验新的映像是否成功启动。

答案 说明最高分值correctness of response Option 422请参见图示。

管理员尝试在路由器上配置 IPv6 的 EIGRP ，但收到如图所示 的错误消息。

配置 IPv6 的 EIGRP 之前，管理员必须发出什么命令？no shutdowneigrp router-id 100.100.100.100ipv6 unicast-routingipv6 eigrp 100ipv6 cef答案 说明 最高分值correctness of response Option 323IPv6 EIGRP 路由器使用哪个地址作为 hello 消息的来源？32 位路由器ID接口上配置的 IPv6 全局单播地址所有 EIGRP 路由器组播地址接口 IPv6 本地链路地址答案 说明 最高分值correctness of response Option 424下列关于 EIGRP 确认数据包的说法，哪两项是正确的？（请选择两项。

）发送该数据包是为了响应 hello 数据包。

该数据包用于发现接口上连接的邻居。

该数据包作为单播发送。

该数据包需要确认。

该数据包不可靠。

答案 说明 最高分值correctness of response Option 3 and Option 5 are correct.25何时发送 EIGRP 更新数据包？仅在必要时当获取的路由过期时每 5 秒通过组播发送每 30 秒通过广播发送答案 说明 最高分值correctness of response Option 126请参见图示。

What is the purpose of VLAN trunking?It improves network performance by reducing broadcast traffic.It selects the best path to transmit data in a switched network.It carries the traffic of multiple VLANs through a single link.It avoids spanning tree loops in a switched network.Refer to the exhibit. Both switches are configured with default bridge priority. Which port will act as the STP root port if all links are oper Fa0/1 interface of S1Fa0/2 interface of S1Fa0/1 interface of S2Fa0/2 interface of S2Refer to the exhibit. The network administrator wants to configure Switch1 to allow SSH connections and prohibit Telnet conne ctions. How sh administrator change the displayed configuration to satisfy the requirement?Use SSH version 1.Reconfigure the RSA key.Configure SSH on a different line.Modify the transport input command.Refer to the exhibit. Which two facts about STP can be determined from the displayed output? (Choose two.)Switch S1 has the lowest configured STP priority in the network.Switch S1 is configured as the root bridge for VLAN1.Fa0/21 is the root port of switch S1.Fa0/22 is the redundant link.Fa0/24 is considered the best path to the root bridge.Which statement correctly describes the spanning-tree path cost?It is calculated based on the total number of switches connected in a loop.It is calculated based on the utilization of all the switches along a given path.It is calculated based on the bridge priority of the switches along a given path.It is calculated based on the sum of the port cost value, determined by link speed, for each switch port along a given path What are two requirements for configuring inter-VLAN routing using the router-on-a-stick model? (Choose two.)Each subinterface should be configured with its own IP address, subnet mask, and unique VLAN assignment.The physical interface of the router must be connected to a trunk link on the adjacent switch.The number of physical interfaces on the router should match the number of VLANs.Different static VLANs should be assigned to different interfaces of the router.The router should be configured as the VTP serverRefer to the exhibit. Which two options correctly describe the router configuration that is shown? (Choose two.)Routing between the 192.168.1.0 and 192.168.3.0 networks will not succeed until a routing protocol is configured on the route r.VLANs have not been appropriately configured on the router subinterfaces.The configuration is appropriate for a router-on-a-stick network design.Trunking has been appropriately configured on the router subinterfaces.An IP address should be applied to interface Fa0/1 for routing to occurRefer to the exhibit. What is true of the configuration of switch S1?A Cisco proprietary protocol is in use for ports Fa0/1 and Fa0/3.Switch ports Fa0/1 and Fa0/3 have been configured with the switchport mode access command.Untagged frames received on ports Fa0/1 and Fa0/3 will be placed on VLAN 1.Switch ports Fa0/1 and Fa0/3 are configured to carry data from multiple VLANs.Refer to the exhibit. Switches S2 and S3 are properly connected using an ethernet cable. A network administrator has configured both s is unable to propagate VLANs to S2. What could be the reason for this?The VTP configuration revision is different on both switches.The VTP domains are different on both switches.VTP pruning is disabled.VTP v2 is disabled.Refer to the exhibit. Router R1 is properly configured for router on a stick inter-VLAN routing, but PC1 is unable to ping PC2. What needs problem?Rename VLAN1.Connect one more port of S1 to R1.Configure the Fa0/1 port of S1 as a trunk port.Move the Fa0/0 interface of R1 to another VLAN.Refer to the exhibit. Router R-West and switch S-West1 are connected via a single ethernet cable between the router interface fa0/0 an fa0/1. The router and switch have been configured with the commands that are displayed in the exhib it. The network administrator ente trunk command and receives the output as shown. What is the cause of the "not-trunking" status for switch port Fa0/1?The trunk is established, but no VLANs have been configured to use it.The router is missing the dynamic trunking protocol statements necessary to form a trunk.Because the router does not support Dynamic Trunking Protocol, the trunk has not been established.The router, the switch, or both must be configured with the dynamic desirable option for Dynamic Trunking Protocol to establish aRefer to the exhibit. All trunk links are operational and all VLANs are allowed on all trunk links. An ARP request is sent by computer 5. W receive this message?only computer 4computer 3 and RTR-Acomputer 4 and RTR-Acomputer 1, computer 2, computer 4, and RTR-Acomputer 1, computer 2, computer 3, computer 4, and RTR-Aall of the computers and the routerRefer to the exhibit. A network administrator enters the displayed commands to configure VLAN 30. What is the result of running these commVLAN 30 will be added to S1, S2, and S3, but not to S4.VLAN 30 will be pruned from the VLAN database of S3.VLAN 30 will be added to the VLAN database of S3 but will not be propagated to S4, S2 or S1.VLAN 30 will not be added to the VLAN database of S3 and an error message will be displayedRefer to the exhibit. VTP pruning is enabled in the VTP domain that is shown. How will switch ST-1 handle Layer 2 broadcast traf host A on switch ST-C?It will be dropped.It will be forwarded out port Fa0/5 only.It will be forwarded out ports Fa0/5 and Fa0/10.It will be forwarded out ports Fa0/5, Fa0/10, and Fa0/15Refer to the exhibit. The devices in the network are operational and configured as indicated in the exhibit. However, hosts A and D other. What is the most likely cause of this problem?The link between the switches is up but not trunked.The Fa0/11 interface of Switch1 is not configured as a trunk.Hosts A and D are configured with IP addresses from different subnets.VLAN 20 and VLAN 30 are not allowed on the trunk between the switches.After unpacking a new Linksys WRT300N wireless multifunction device, a user needs to change the default administrator passwor d and make other configuration changes. What must the user do to access the device in order to make these changes?Use a wireless client to associate with the WRT300N and then open a HyperTerminal session with the device.Establish a wired connection with the device and then reboot the attached computer to launch the configuration software.Establish a wired connection from a computer in the same IP subnet as the WRT300N and enter the default IP address of the device into a web browser on the computer.Modify the TCP/IP properties of the computer that is connected to the WRT300N so that the computer and the WRT300N exist on the same network. Then reboot the computer to establish a connection.Refer to the exhibit. How is port Gi1/1 on SWT-A functioning in the spanning-tree topology?It is sending and receiving data frames.It is receiving BPDUs, but not sending data frames.It is participating in the election process by forwarding the BPDUs it receives.It is receiving BPDUs and populating the MAC address table, but not sending data.Refer to the exhibit. The switches have been configured as shown. The hosts that are connected to switch 101-2FL are not able to communicate with the hosts in their corresponding VLANs that are connected to switch 101-3FL. What should be done to fix the problem?Configure port Fa0/2 on switch 101-3FL as a static trunk link.Introduce a Layer 3 device or a switch with Layer 3 capability into the topology.Utilize the switchport trunk allowed vlan all command on switch 101-3FL to permit the VLAN traffic.Apply IP addresses that are in the same subnet to the interfaces that are used to connect switches 101-2FL and 101-3FLAfter listening for the presence of a signal on the network media, hosts A and C transmit data at the same time. In what two ways do the hosts respond to this situation? (Choose two.)The hosts transmit a jam signal to ensure that all hosts on the network are aware that a collision has occured.Because they are operating in full-duplex mode, the hosts resume listening for traffic in preparation for sending future messages.Because the hub will temporarily block traffic from one of the hosts, that host will be allowed to transmit once the wire is clear.Hosts A and C are assigned shorter backoff values to provide them priority to access the media for retransmission.After the backoff period of a host, the host checks to determine if the line is idle before retransmittingRefer to the exhibit. Hosts PC_A and PC_B send traffic simultaneously, and the frames from the transmitting stations collide.What is the last device to receive the collision?hub HB1switch SW1router R1switch SW2router R2switch SW4Refer to the exhibit. Switch SW2 has been newly purchased and added to the network. What configuration should be applied to SW2 so thatit participates in the same VTP domain as switch SW1, receives VLAN information from SW1, and synchronizes VLAN information?Disable VTP pruning on SW2.Configure SW2 in VTP transparent mode.Configure SW2 with the VTP domain password.Configure SW2 as a VTP server with a higher revision numberWhen configuring a router to act as an SSH server, what should be configured before issuing the crypto key generate rsacommand?the security domain namethe VTP domain namethe IP domain namethe host nameRefer to the exhibit. The switch VTY lines have been properly configured, but PC1 is unable to remotely manage the switch. How can this problem be resolved?Configure the Fa0/1 interface of the switch in trunk mode.Configure a default gateway on the switch.Configure the native VLAN on the switch.Configure the Fa0/1 interface of the switch to allow all VLANsRefer to the exhibit. A network administrator has segmented the network into two VLANs. The connected hosts can only access r esources in their own VLAN. What is the most scalable and cost effective solution to allow inter-VLAN communication in this network?Replace S1 with a router that has one FastEthernet interface for each PC.Add a second switch and divide the PCs so that each VLAN is connected to its own switch.Configure a router with two subinterfaces on one of its FastEthernet ports and connect it to S1 using a trunk link.Connect a router to a port on S1 and assign the IP address of VLAN1 to the connecting router interfaceRefer to the exhibit. An administrator documented the output of a CAM table from an Ethernet switch as shown. What action will the switch take when it receives the frame shown at the bottom of the exhibit?discard the frameforward the frame out port 2forward the frame out port 3forward the frame out all portsforward the frame out all ports except port 3add station 00-00-3D-1F-11-05 to port 2 in the forwarding tableWhich statement regarding the service password-encryption command is true?The service password-encryption command is entered at the privileged EXEC mode prompt.The service password-encryption command encrypts only passwords for the console and VTY ports.The service password-encryption command encrypts all previously unencrypted passwords in the running configuration.To see the passwords encrypted by the service password-encryption command, enter the no servicepassword-encryption commandWhich statement correctly describes the function of a Layer 2 switch?It performs switching and filtering based on the destination network layer address.It automatically uses STP to prevent switching loops in redundant topologies.It uses VTP to allow data from multiple VLANs to travel across a single link.It routes packets between different LAN segmentsWhich three statements are correct concerning the default configuration of a new switch? (Choose three.)It is configured in VTP server mode.STP is automatically enabled.The first VTY line is automatically configured to allow remote connections.VLAN1 is configured with a management IP address.All switch ports are assigned to VLAN1.The enable password is configured as ciscoRefer to the exhibit. How will switch S2 manage traffic coming from host PC1?S2 will drop the traffic, unless it is management traffic.S2 will tag the frame with VLAN ID 99 when it forwards it over the trunk link.S2 will leave the traffic untagged when it forwards it over a trunk link.S2 will tag the traffic with the highest VLAN ID value when it forwards it over the trunk link.Refer to the exhibit. The network administrator needs to remove the east-hosts VLAN and use the switch port from that VLAN in one of the existing VLANs. Which two sets of commands should be used when completely removing VLAN 2 from S1-Central while leaving the switch and all its interfaces operational? (Choose two.)S1-Central>enableS1-Central# reloadS1-Central>enableS1-Central# erase flash:S1-Central>enableS1-Central# delete flash:vlan.datS1-Central>enableS1-Central# configure terminalS1-Central(config)# no vlan 2S1-Central>enableS1-Central# configure terminalS1-Central(config-if)# interface fastethernet 0/1 S1-Central(config-if)# switchport access vlan 3Refer to the exhibit. The network administrator configures both switches as displayed. However, host C is unable to ping host D and host E is unable to ping host F. What action should the administrator take to enable this communication?Include a router in the topology.Associate hosts A and B with VLAN 10 instead of VLAN 1.Remove the native VLAN from the trunk.Configure one trunk port in the dynamic desirable mode.Add the switchport nonegotiate command to the configuration of S2Which two statements are correct about wireless infrastructure components? (Choose two.)An AP converts the TCP/IP data packets from their 802.11 frame encapsulation format to the 802.3 Ethernetframe format on the wired Ethernet network.A wireless AP does not require any physical connection to allow wireless clients to access the Internet.An AP is a layer 2 device, similar to a switch, that provides dedicated bandwidth to each connected wireless host.Collisions do not occur between wireless NICs and APs.The wireless router performs the roles of AP and router.Refer to the exhibit. The switches are configured for VTP as shown. Which two statements correctly describe the operation of these switches? (Choose two.)A new VLAN can be added to Switch1 and that information will be added only to Switch2.A new VLAN can be added to Switch1 and that information will be added to Switch2 and Switch4.An existing VLAN can be deleted from Switch4 and that VLAN will be deleted from Switch1 and Switch2.An existing VLAN can be deleted from Switch2 and that VLAN will be deleted from Switch1 and Switch4.A new VLAN can be added to Switch4 and that information will be added to Switch1, Switch2, and Switch3.A new VLAN can be added to Switch3 and that information will be added to Switch1, Switch2, and Switch4A new switch is to be added to an exis ting network in a remote office. The network administrator does not wantthe technicians in the remote office to be able to add new VLANs to the switch, but the switch should receive VLAN updates from the VTP domain. Which two steps must be performed to configure VTP on the new switch to meet these conditions? (Choose two.)Configure an IP address on the new switch.Configure the existing VTP domain name on the new switch.Configure all ports of both switches to access mode.Configure the new switch as a VTP client.Enable VTP pruningWhich two statements describe Spanning Tree Protocol? (Choose two.)It is only used at Layer 2.It is configured on routers.It eliminates Layer 2 loops in network topologies.It limits the number of valid MAC addresses allowed on a port.It allows VLAN information to propagate to other switches in the network.Refer to the exhibit. Which switch will be elected as the root bridge of the spanning tree topology?Cat-ACat-BCat-CCat-DRefer to the exhibit. What three statements describe why Host1 and Host2 are unable to communicate? (Choose three.)The switch ports are on different VLANs.The switch IP address is on the wrong subnet.The hosts are configured on different logical networks.A router is required to forward traffic between Host1 and Host2.The VLAN port assignments must be contiguous for each VLAN.The host default gateway addresses must be on the same logical network.Refer to the exhibit. A new host needs to be connected to VLAN 3. Which IP address should be assigned to this new host?192.168.1.22 /28192.168.1.31 /28192.168.1.32 /28192.168.1.52 /28192.168.1.63 /28Refer to the exhibit. Router RA receives a packet with a source address of 192.168.1.65 and a destination address of 192.168.1.161. What will the router do with this packet?The router will drop the packet.The router will forward the packet out interface FastEthernet 0/1.1.The router will forward the packet out interface FastEthernet 0/1.2.The router will forward the packet out interface FastEthernet 0/1.3.The router will forward the packet out interface FastEthernet 0/1.2 and interface FastEthernet 0/1.3Refer to the exhibit. On which of the devices in this network should routing between VLANs take place?the core layer devicesthe access layer devicesthe distribution layer devicesthe core and distribution layer devicesRefer to the exhibit. The teacher host is connected to port Fa0/7 on switch STW. A student has decided to share access to the Internet by attaching a hub and laptop to STW as shown. What will be the result of the student making this connection?The Fa0/7 port of STW will be shutdown.The student will gain full access to the Internet.Both the teacher and student will be able to receive data but only the teacher will be able to send.The frames from the laptop will be dropped, but the teacher host will maintain connectivity with the network.Refer to the exhibit. In what two ways will the router handle VLAN traffic that is received on the trunk? (Choose two.)Traffic to VLAN 1 received by the router interface Fa0/0 will be dropped by the router.Because interface Fa0/0 requires an IP address, the router will not be able to route between the VLANs.Packets that are received from network 192.168.20.0 /24 will be handled by subinterface Fa0/0.20.The router will use subinterface MAC addresses to identify the VLAN traffic that is received on the physical interface.The router will continue to process traffic from the attached VLANs even if the physical interface goes downRefer to the exhibit. Switch SW-A is to be used as a temporary replacement for another switch in the VTP Studentdomain. What two pieces of information are indicated from the exhibited output? (Choose two.)The other switches in the domain can be running either VTP version 1 or 2.There is a risk that the switch may cause incorrect VLAN information to be sent through the domain.VTP will block frame forwarding on at least one redundant trunk port that is configured on this switch.VLAN configuration changes made on this switch will be sent to other devices in the VTP domain.This switch will update its VLAN configuration when VLAN changes are made on a VTP server in the same domainWhat are three benefits of employing a hierarchical network design? (Choose three.)Hierarchically designed networks can more easily be expanded to suit future needs.Hierarchical design models enhance existing bandwidth through the use of link aggregation.The hierarchical model allows for specialized functionality at each layer, simplifying devicemanagement.Use of a hierarchical design allows replacement of redundant devices with high-capacity network equipment.A hierarchical design uses firewalls instead of complicated port-based and distribution layer securitypolicies.The hierarchical model allows the use of high-performance switches at all design layers, thus allowing for a fully-meshed topologyRefer to the exhibit. Hosts A and B attempt to transmit a frame at the same time and a collision occurs. When will host D be able to transmit?immediatelyafter sending its jam signalafter host A and host B have completed transmissionafter the jam signal clears and its backoff delay expiresWhat provides an authentication mechanism for 802.11-based wireless networks?DSSSOFDMSSIDWPARefer to the exhibit. What is the effect of setting the security mode to WEP on the Linksys integrated router?WEP identifies the wireless LAN.WEP allows the access point to inform clients of its presence.WEP translates IP addresses into easy-to-remember domain names.WEP encrypts data between the wireless client and the access point.WEP ensures that only authenticated users are allowed access to the WLAN.WEP translates an internal address or group of addresses into an outside, public address.Refer to the exhibit. SW-T has been configured with a single trunking interface. Which VLANs will be allowed across the trunk?Only VLAN 1 will be allowed across the trunk.All configured VLANs will be allowed across the trunk.Only the native VLAN will be allowed across the trunk.Only the the management and native VLANs will be allowed across the trunk.Only VLANs that are configured on the VTP server in the dom ain will be allowed across the trunkRefer to the exhibit. What does the term DYNAMIC indicate in the output that is shown?This entry can only be removed from the MAC address table by a network administrator.When forwarding a frame to the device with address 0060.5c5b.cd23, the switch does not have to perform a lookup to determine the final destination port.Only the device with MAC address 0060.5c5b.cd23 will be allowed to connect to port Fa0/18.The switch learned this MAC address from the source address in a frame received on Fa0/18.Refer to the exhibit. What is the purpose of the configuration commands that are shown?to activate port Fa0/10to make the port a member of VLAN 30to activate port security on port Fa0/10to add VLAN 30 to the trunk that is connected to port Fa0/10。

三期期末题1请参见图示。

主机A 无法ping 通R1。

应在R1 上执行哪两项配置步骤以解决此问题？（选择两项。

）C正确配置访问该路由器的线路口令。

配置接口速率。

管理性启用接口。

在路由器上配置动态路由协议。

在路由器上正确配置子网掩码。

2 一个网络横跨相距500 英尺（152 米）的两栋楼房。

在电缆路径附近装有一台电力变压器。

该网络应使用哪种类型的电缆？DSTPUTP同轴光纤3 以下哪种说法正确描述了AAA 的功能？A防止对网络进行未授权的访问。

根据目的IP 和端口号过滤流量。

使用户可以发送信息到运行在管理站上的守护进程。

加密数据以保障网络安全性。

4请参见图示。

从图中所示的输出中可得出什么结论？ C此路由器上启用了PPP。

接口的带宽设置符合T1 连接要求。

serial0/0/0 接口已管理性关闭。

``````````````````````````````serial0/0/0 接口设置了默认封装。

serial0/0/0 接口设置了子网掩码255.255.255.255。

5请参见图示。

哪些电缆路径段需要使用交叉电缆？CA、D、FB、C、EB、D、EA、C、F6 为了将初始配置加载到一台新的交换机上，网络管理员将一台笔记本电脑通过控制台电缆连接到这台交换机上。

大约一分钟后，网络管理员启动了该交换机，发现交换机前部的SYST LED 从闪烁的绿色转为琥珀色。

请问这意味着什么？笔记本电脑与交换机之间的物理连接不正确。

交换机正在等待配置文件加载。

交换机的一个端口出现故障。

```````````````````` 交换机POST 失败。

D7 UDP 具有哪项特点？ C是一种可靠的传输协议。

要求源主机重新发送未得到确认的数据包。

```````````````````````数据传输时所增加的开销较低。

是一种面向连接的协议。

8请参见图示。

主机 A 无法ping 通主机B。

为解决此问题可采取哪两项措施？（选择两项。

假设没有使用 VLSM，添加 ip route 172.16.64.0 255.255.240.0 serial0/0 命令会对网络中正在工作的路由器造成什么影响？3目的地址处于 172.16.64.1 到 172.16.80.254 之间的所有数据包都会通过serial0/0 转发出去。

目的地址处于 172.16.64.1 到 172.16.255.254 之间的所有数据包都会通过serial0/0 转发出去。

目的地址处于 172.16.64.1 到 172.16.79.254 之间的所有数据包都会通过serial0/0 转发出去。

目的地址处于 172.16.0.1 到 172.16.64.254 之间的所有数据包都会通过serial0/0 转发出去。

2请参见图示。

管理员正在向网络中添加新路由器。

IP 地址 192.168.13.6/30 已被分配给 R2 上的相连串行接口。

管理员必须为新路由器的串行接口分配什么IP 地址？2192.168.13.4/30192.168.13.5/30192.168.13.7/30192.168.13.58/30192.168.13.61/27192.168.13.63/273OSPF 路由协议身份验证使用 MD5 验证时，下列有关密钥的说法中哪两项正确？（选择两项。

）24密钥以明文形式在路由器之间传递。

密钥用于帮助生成验证用的加密数字。

密钥以加密形式在路由器之间传递。

密钥永远不会在网络上传输。

数据包嗅探器可以捕获密钥。

4请参见图示。

路由表中将显示哪些路由？1R 10.10.4.0/24 [120/1] via 10.10.10.1, 00:00:12, FastEthernet0/1R 10.10.4.0/24 [120/1] via 10.10.20.1, 00:00:12, FastEthernet0/0R 10.10.4.0/24 [120/2] via 10.10.20.1, 00:00:12, FastEthernet0/0R 10.10.4.0/24 [120/3] via 10.10.30.1, 00:00:12, FastEthernet1/0R 10.10.4.0/24 [120/1] via 10.10.30.1, 00:00:12, FastEthernet1/05请参见图示。

CCNA(1)适用班级：CCNA注意事项：1.在试卷的标封处填写姓名和班级2.考试时间共120分钟3.答案写在答题卡上1. What is the maximum number of IP addresses that can be assigned to hosts on a local subnetthat uses the subnet maskA. 14B. 15C. 16D. 30E. 31F. 622. You have a network that needs 29 subnets while maximizing the number of host addressesavailable on each subnet. How many bits must you borrow from the host field to provide thecorrect subnet maskA. 2B. 3C. 4D. 5E. 6F. 73. What is the subnetwork address for a host with the IP address The network address of provides how many subnets and hostsA. 7 subnets, 30 hosts eachB. 7 subnets, 2,046 hosts eachC. 7 subnets, 8,190 hosts eachD. 8 subnets, 30 hosts eachE. 8 subnets, 2,046 hosts eachF. 8 subnets, 8,190 hosts each5. Which two statements describe the IP address 10.16.3.65/23 (Choose two.)A. The subnet address is 10.16.3.0 The lowest host address in the subnet is 10.16.2.1 The last valid host address in the subnet is 10.16.2.254 The broadcast address of the subnet is 10.16.3.255 The network is not subnetted.6. If a host on a network has the address what is the subnetwork this hostbelongs toA. On a VLSM network, which mask should you use on point-to-point WAN links in order toreduce the waste of IP addressesA. /27B. /28C. /29D. /30E. /318. What is the subnetwork number of a host with an IP address of You have an interface on a router with the IP address of Including the routerinterface, how many hosts can have IP addresses on the LAN attached to the router interfaceA. 6B. 8C. 30D. 62E. 12610. You need to configure a server that is on the subnet The router has the firstavailable host address. Which of the following should you assign to the serverA. You have an interface on a router with the IP address of What is thebroadcast address the hosts will use on this LANA. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classfulsubnet mask would you useA. A network administrator is connecting hosts A and B directly through their Ethernet interfaces,as shown in the illustration. Ping attempts between the hosts are unsuccessful. What can bedone to provide connectivity between the hosts (Choose two.)A. A crossover cable should be used in place of the straight-through cable.B. A rollover cable should be used in place of the straight-through cable.C. The subnet masks should be set to A default gateway needs to be set on each host.E. The subnet masks should be set to Address: Address: Cable164 Chapter 3 Subnetting, VLSMs, and Troubleshooting TCP/IP14. If an Ethernet port on a router were assigned an IP address of what wouldbe the valid subnet address of this hostA. Using the following illustration, what would be the IP address of E0 if you were using theeighth subnet The network ID is and you need to use the last available IPaddress in the range. The zero subnet should not be considered valid for this question.A. Using the illustration from the previous question, what would be the IP address of S0 if you wereusing the first subnet The network ID is and you need to use the last availableIP address in the range. Again, the zero subnet should not be considered valid for this question.A. Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is Router(config)#ip classlessB. Router(config)#ip version 6C. Router(config)#no ip classfulD. Router(config)#ip unnumberedE. Router(config)#ip subnet-zeroF. Router(config)#ip all-nets18. You have a network with a subnet of Which is the valid host addressA. Your router has the following IP address on Ethernet0: Which of the following can be valid host IDs on the LAN interface attached to the router (Choose two.)A. To test the IP stack on your local host, which IP address would you pingA. 1.0.0.127C. You type show running-config and get this output:[output cut]Line console 0Exec-timeout 1 44Password 7098C0BQRLogin[output cut]What do the two numbers following the exec-timeout command meanA. If no command has been typed in 44 seconds, the console connection will be closed.B. If no router activity has been detected in 1 hour and 44 minutes, the console will be locked out.C. If no commands have been typed in 1 minute and 44 seconds, the console connection willbe closed.D. If you’re connected to the router by a Telnet connection, input must be detected within 1 minute and 44 seconds or the connection will be closed.22. You need to find the broadcast address used on a LAN on your router. What command willyou type into the router from user mode to find the broadcast addressA. show running-configB. show startup-configC. show interfacesD. show protocols23. You want to totally reinitialize the router and replace the current running-config with the current startup-config. What command will you useA. replace run startB. copy run startC. copy start runD. reloadReview Questions 24324. Which command will show you whether a DTE or a DCE cable is plugged into serial 0A. sh int s0B. sh int serial 0C. show controllers s 0D. show serial 0 controllers25. What keystroke will terminate setup modeA. Ctrl+ZB. Ctrl+^C. Ctrl+CD. Ctrl+Shift+^26. You set the console password, but when you display the configuration, the password doesn’t show up; it looks like this:[output cut]Line console 0Exec-timeout 1 44Password 7098C0BQRLogin[output cut]What cause the password to be stored like thisA. encrypt passwordB. service password-encryptionC. service-password-encryptionD. exec-timeout 1 4427. Which of the following commands will configure all the default VTY ports on a routerA. Router#line vty 0 4B. Router(config)#line vty 0 4C. Router(config-if)#line console 0D. Router(config)#line vty all28. Which of the following commands sets the secret password to CiscoA. enable secret password CiscoB. enable secret ciscoC. enable secret CiscoD. enable password Cisco244 Chapter 4 Cisco’s IOS and Security Device Manager29. If you wanted administrators to see a message when logging into the router, which command would you useA. message banner motdB. banner message motdC. banner motdD. message motd30. How many simultaneous Telnet sessions does a Cisco router support by defaultA. 1B. 2C. 3D. 4E. 5F. 631. What command do you type to save the configuration stored in RAM to NVRAMA. Router(config)#copy current to startingB. Router#copy starting to runningC. Router(config)#copy running-config startup-configD. Router#copy run startup32. You try to telnet into SFRouter from router Corp and receive this message:Corp#telnet SFRouterTrying SFRouter (10.0.0.1)…OpenPassword required, but none set[Connection to SFRouter closed by foreign host]Corp#Which of the following sequences will address this problem correctlyA. Corp(config)#line console 0B. SFRemote(config)#line console 0C. Corp(config)#line vty 0 4D. SFRemote(config)#line vty 0 433. Which command will delete the contents of NVRAM on a routerA. delete NVRAMB. delete startup-configC. erase NVRAMD. erase startReview Questions 24534. What is the problem with an interface if you type show interface serial 0 and receive the following messageSerial0 is administratively down, line protocol is downA. The keepalives are different times.B. The administrator has the interface shut down.C. The administrator is pinging from the interface.D. No cable is attached.35. Which of the following commands displays the configurable parameters and statistics of all interfaces on a routerA. show running-configB. show startup-configC. show interfacesD. show versions36. If you delete the contents of NVRAM and reboot the router, what mode will you be inA. Privileged modeB. Global modeC. Setup modeD. NVRAM loaded mode37. You type the following command into the router and receive the following output: Router#show serial 0/0^% Invalid input detected at ‘^’marker.Why was this error message displayedA. You need to be in privileged mode.B. You cannot have a space between serial and 0/0.C. The router does not have a serial0/0 interface.D. Part of the command is missing.38. You type Router#sh ru and receive an % ambiguous command error. Why did you receivethis messageA. The command requires additional options or parameters.B. There is more than one show command that starts with the letters ru.C. There is no show command that starts with ru.D. The command is being executed from the wrong router mode.246 Chapter 4 Cisco’s IOS and Security Device Manager39. Which of the following commands will display the current IP addressing and the layer 1 and2 status of an interface (Choose three.)A. show versionB. show protocolsC. show interfacesD. show controllersE. show ip interfaceF. show running-config40. What layer of the OSI model would you assume the problem is in if you type show interface serial 1 and receive the following messageSerial1 is down, line protocol is downA. Physical layerB. Data Link layerC. Network layerD. None; it is a router problem.41. What does the command o/r 0x2142 provideA. It is used to restart the router.B. It is used to bypass the configuration in NVRAM.C. It is used to enter ROM Monitor mode.D. It is used to view the lost password.42. Which command will copy the IOS to a backup host on your networkA. transfer IOS to copy run startC. copy tftp flashD. copy start tftpE. copy flash tftp43. You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault.What IOS user exec command should you issueA. Router>pingB. Router>traceC. Router>show ip routeD. Router>show interfaceE. Router>show cdp neighbors44. You copy a configuration from a network host to a router’s RAM. The configuration looks correct, yet it is not working at all. What could the problem beA. You copied the wrong configuration into RAM.B. You copied the configuration into flash memory instead.C. The copy did not override the shutdown command in running-config.D. The IOS became corrupted after the copy command was initiated.45. A network administrator wants to upgrade the IOS of a router without removing the image currently installed. What command will display the amount of memory consumed by the currentIOS image and indicate whether there is enough room available to hold both the currentand new imagesA. show versionB. show flashC. show memoryD. show buffersE. show running-config46. The corporate office sends you a new router to connect, but upon connecting the console cable,you see that there is already a configuration on the router. What should be done before a new configuration is entered in the routerA. RAM should be erased and the router restarted.B. Flash should be erased and the router restarted.C. NVRAM should be erased and the router restarted.D. The new configuration should be entered and saved.47. Which command loads a new version of the Cisco IOS into a routerA. copy flash ftpB. copy ftp flashC. copy flash tftpD. copy tftp flash48. Which command will show you the IOS version running on your routerA. sh IOSB. sh flashC. sh versionD. sh running-config49. What should the configuration register value be after you successfully complete the password recovery procedure and return the router to normal operationA. 0x2100B. 0x2101C. 0x2102D. 0x214250. You save the configuration on a router with the copy running-config startup-configcommand and reboot the router. The router, however, comes up with a blank configuration.What can the problem beA. You didn’t boot the router with the correct command.B. NVRAM is corrupted.C. The configuration register setting is incorrect.D. The newly upgraded IOS is not compatible with the hardware of the router.E. The configuration you save is not compatible with the hardware.51. If you want to have more than one Telnet session open at the same time, what keystroke combination would you useA. Tab+spacebarB. Ctrl+X, then 6C. Ctrl+Shift+X, then 6D. Ctrl+Shift+6, then X52. You are unsuccessful in telnetting into a remote device. What could the problem be (Choose two.)A. IP addresses are incorrect.B. Access control list is filtering Telnet.C. There is a defective serial cable.D. The VTY password is missing.53. What information is displayed by the show hosts command (Choose two.)A. Temporary DNS entriesB. The names of the routers created using the hostname commandC. The IP addresses of workstations allowed to access the routerD. Permanent name-to-address mappings created using the ip host commandE. The length of time a host has been connected to the router via Telnet54. Which three commands can be used to check LAN connectivity problems on a router(Choose three.)A. show interfacesB. show ip routeC. tracertD. pingE. dns lookups55. You telnet to a router and make your necessary changes; now you want to end the Telnet session. What command do you type inA. closeB. disableC. disconnectD. exit56. You telnet into a remote device and type debug ip rip, but no output from the debug command is seen. What could the problem beA. You must type the show ip rip command first.B. IP addressing on the network is incorrect.C. You must use the terminal monitor command.D. Debug output is sent only to the console.57. Which command displays the configuration register settingA. show ip routeB. show boot versionC. show versionD. show flash58. You need to gather the IP address of a remote switch that is located in Hawaii. What can youdo to find the addressA. Fly to Hawaii, console into the switch, then relax and have a drink with an umbrella in it.B. Issue the show ip route command on the router connected to the switch.C. Issue the show cdp neighbor command on the router connected to the switch.D. Issue the show ip arp command on the router connected to the switch.E. Issue the show cdp neighbors detail command on the router connected to the switch.59. You have your laptop directly connected into a router’s Ethernet port. Which of the following are among the requirements for the copy flash tftp command to be successful (Choose three.)A. TFTP server software must be running on the router.B. TFTP server software must be running on your laptop.C. The Ethernet cable connecting the laptop directly into the router’s Ethernet port mu st bea straight-through cable.D. The laptop must be on the same subnet as the router’s Ethernet interface.E. The copy flash tftp command must be supplied the IP address of the laptop.F. There must be enough room in the flash memory of the router to accommodate the file tobe copied.60. The configuration register setting of 0x2102 provides what function to a routerA. Tells the router to boot into ROM monitor modeB. Provides password recoveryC. Tells the router to look in NVRAM for the boot sequenceD. Boots the IOS from a TFTP serverE. Boots an IOS image stored in ROM61. A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication sessionA. Send a different source port number.B. Restart the virtual circuit.C. Decrease the sequence number.D. Decrease the window size.62. Which fields are contained within an IEEE Ethernet frame header (Choose two.)A. Source and destination MAC addressB. Source and destination network addressC. Source and destination MAC address and source and destination network addressD. FCS field63. Which layer 1 devices can be used to enlarge the area covered by a single LAN segment (Choose two.)A. SwitchB. NICC. HubD. RepeaterE. RJ45 transceiver64. Segmentation of a data stream happens at which layer of the OSI modelA. PhysicalB. Data LinkC. NetworkD. Transport65. Which of the following describe router functions (Choose four.)A. Packet switchingB. Collision preventionC. Packet filteringD. Broadcast domain enlargementE. Internetwork communicationF. Broadcast forwardingG. Path selection66. Routers operate at layer __. LAN switches operate at layer __. Ethernet hubs operate at layer __. Word processing operates at layer __.A. 3, 3, 1, 7B. 3, 2, 1, noneC. 3, 2, 1, 7D. 2, 3, 1, 7E. 3, 3, 2, none67. When data is encapsulated, which is the correct orderA. Data, frame, packet, segment, bitB. Segment, data, packet, frame, bitC. Data, segment, packet, frame, bitD. Data, segment, frame, packet, bit68. Why does the data communication industry use the layered OSI reference model (Choose two.)A. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.B. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.C. It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.D. It encourages industry standardization by defining what functions occur at each layer ofthe model.E. It provides a framework by which changes in functionality in one layer require changes inother layers.69. What are two purposes for segmentation with a bridgeA. To add more broadcast domainsB. To create more collision domainsC. To add more bandwidth for usersD. To allow more broadcasts for users70. Which of the following are unique characteristics of half-duplex Ethernet when compared tofull-duplex Ethernet (Choose two.)A. Half-duplex Ethernet operates in a shared collision domain.B. Half-duplex Ethernet operates in a private collision domain.C. Half-duplex Ethernet has higher effective throughput.D. Half-duplex Ethernet has lower effective throughput.E. Half-duplex Ethernet operates in a private broadcast domain.58 Chapter 1 Internetworking71. You want to implement a network medium that is not susceptible to EMI. Which type of cabling should you useA. Thicknet coaxB. Thinnet coaxC. Category 5 UTP cableD. Fiber-optic cable72. Acknowledgments, sequencing, and flow control are characteristics of which OSI layerA. Layer 2B. Layer 3C. Layer 4D. Layer 773. Which of the following are types of flow control (Choose all that apply.)A. BufferingB. Cut-throughC. WindowingD. Congestion avoidanceE. VLANs74. Which of the following types of connections can use full duplex (Choose three.)A. Hub to hubB. Switch to switchC. Host to hostD. Switch to hubE. Switch to host75. What is the purpose of flow controlA. To ensure that data is retransmitted if an acknowledgment is not receivedB. To reassemble segments in the correct order at the destination deviceC. To provide a means for the receiver to govern the amount of data sent by the senderD. To regulate the size of each segment76. Which three statements are true about the operation of a full-duplex Ethernet networkA. There are no collisions in full-duplex mode.B. A dedicated switch port is required for each full-duplex node.C. Ethernet hub ports are preconfigured for full-duplex mode.D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.E. The host network card and the switch port must be capable of operating in full-duplex mode. Review Questions 5977. What type of RJ45 UTP cable is used between switchesA. Straight-throughB. Crossover cableC. Crossover with a CSU/DSUD. Crossover with a router in between the two switches78. How does a host on an Ethernet LAN know when to transmit after a collision has occurred (Choose two.)A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.C. You can improve the CSMA/CD network by adding more hubs.D. After a collision, the station that detected the collision has first priority to resend thelost data.E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.79. What type of RJ45 UTP cable do you use to connect a PC’s COM port to a router or switch console portA. Straight-throughB. Crossover cableC. Crossover with a CSU/DSUD. Rolled80. You have the following binary number:What are the decimal and hexadecimal equivalentsA. 69/0x2102B. 183/B7C. 173/A6D. 83/0xC581. What are the decimal and hexadecimal equivalents of the binary number(Choose two.)A. 159B. 157C. 185D. 0x9DE. 0xD9F. 0x15982. Which of the following allows a router to respond to an ARP request that is intended for a remote hostA. Gateway DPB. Reverse ARP (RARP)C. Proxy ARPD. Inverse ARP (IARP)E. Address Resolution Protocol (ARP)83. You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you useto accomplish thisA. SMTPB. SNMPC. DHCPD. ARP84. What protocol is used to find the hardware address of a local deviceA. RARPB. ARPC. IPD. ICMPE. BootP85. Which of the following are layers in the TCP/IP model (Choose three.)A. ApplicationB. SessionC. TransportD. InternetE. Data LinkF. Physical86. Which class of IP address provides a maximum of only 254 host addresses per network IDA. Class AB. Class BC. Class CD. Class DE. Class E87. Which of the following describe the DHCP Discover message (Choose two.)A. It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.B. It uses UDP as the Transport layer protocol.C. It uses TCP as the Transport layer protocol.D. It does not use a layer 2 destination address.8. Which layer 4 protocol is used for a Telnet connectionA. IPB. TCPC. TCP/IPD. UDPE. ICMP89. Which statements are true regarding ICMP packets (Choose two.)A. They acknowledge receipt of a TCP segment.B. They guarantee datagram delivery.C. They can provide hosts with information about network problems.D. They are encapsulated within IP datagrams.E. They are encapsulated within UDP datagrams.90. Which of the following services use TCP (Choose three.)A. DHCPB. SMTPC. SNMPD. FTPE. HTTPF. TFTP91. Which of the following services use UDP (Choose three.)A. DHCPB. SMTPC. SNMPD. FTPE. HTTPF. TFTP92. Which of the following are TCP/IP protocols used at the Application layer of the OSI model (Choose three.)A. IPB. TCPC. TelnetD. FTPE. TFTP93. The following illustration shows a data structure header. What protocol is this header fromA. IPB. ICMPC. TCPD. UDPE. ARPF. RARP94. If you use either Telnet or FTP, which is the highest layer you are using to transmit dataA. ApplicationB. PresentationC. SessionD. Transport95. The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI modelA. ApplicationB. Host-to-HostC. InternetD. Network Access96. Which two of the following are private IP addressesA. 12.0.0.1B. What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model A. ApplicationB. Host-to-HostC. InternetD. Network Access98. Which statements are true regarding ICMP packets (Choose two)A. ICMP guarantees datagram delivery.B. ICMP can provide hosts with information about network problems.C. ICMP is encapsulated within IP datagrams.D. ICMP is encapsulated within UDP datagrams.99. What is the address range of a Class B network address in binaryA. 01xxxxxxB. 0xxxxxxxC. 10xxxxxxD. 110xxxxx100. Which of the following protocols uses both TCP and UDPA. FTPB. SMTPC. TelnetD. DNS答题卡。

思科期末考试题库和答案一、单选题1. 在思科网络技术中，OSI模型的第4层是什么？A. 传输层B. 会话层C. 表示层D. 应用层答案：A2. 以下哪个协议是用于在网络层进行路由选择的？A. TCPB. IPC. UDPD. FTP答案：B3. 动态主机配置协议（DHCP）工作在OSI模型的哪一层？A. 应用层B. 传输层C. 网络层D. 数据链路层答案：D4. 以下哪个命令用于在思科设备上查看当前配置？A. show running-configB. show startup-configC. show interface statusD. show ip route答案：A5. 在思科设备上，哪个命令用于保存当前的配置到启动配置中？A. copy running-config startup-configB. copy startup-config running-configC. saveD. write答案：A二、多选题6. 以下哪些是思科交换机上常用的端口类型？A. FastEthernetB. GigabitEthernetC. TenGigabitEthernetD. Serial答案：A, B, C, D7. 在思科设备上，以下哪些命令用于管理VLAN？A. vlan databaseB. enableC. configure terminalD. exit答案：A, C8. 以下哪些是思科路由器上常用的接口类型？A. FastEthernetB. GigabitEthernetC. SerialD. ATM答案：A, B, C, D9. 以下哪些是思科设备上用于查看网络状态的命令？A. show ip interface briefB. show running-configC. show interface statusD. ping答案：A, C, D10. 在思科设备上，以下哪些命令用于配置静态路由？A. ip routeB. ip routingC. routeD. configure terminal答案：A, D三、判断题11. 思科的IOS（Internetworking Operating System）是运行在所有思科设备上的软件。

请参见图示。

所有中继链路工作正常，而且允许所有VLAN使用所有中继链路。

计算机5 ARP请求。

哪台或哪些设备会收到此消息？仅计算机4* 计算机3和RTR-A计算机4和RTR-A计算机1、计算机2、计算机4和RTR-A计算机1、计算机2、计算机3、计算机4和RTR-A所有计算机和路由器F列关于在接入点上启用开放式身份验证的陈述，哪一项是正确的? *不需要身份验证使用64位加密算法需要使用身份验证服务器需要共同商定的密码VL^N Flane Status Ports1ctefauft active FaOl Fa0/2 FaO/3. Fa0/4 10accounting FaO/5. FaCVG Fa0.7 Fa0/820marking actr/e FaO/5, FaO'10, Fa(V11FaO/12. FaO/U FaO/14 research Faons, FaO/16 FaOH7FaO/16. FaO/19. Fa0/201QQ management adve FaO/21, FaQ/22. FaO'23Fa0/24, GiOJ1, G iO/21002W-default act/unsup1003loken-ring-1 efault act/unsup1004■fddinet-ctefaijlt act/unsup1005act/unsup请参见图示。

该交换机用于让图中所示部门的成员实现连接，但不存在路由。

连接到应该能够与accounting VLAN 中的用户通信。

下列哪项更改可实现所需通信？将该用户连接到GiO/1。

*将该用户连接到FaO/6。

将该用户添加到本征VLAN将该用户添加到默认VLAN分层网络模型具有哪三项优点？（选择三项。

）Opti on 1,36带宽争用现象减少」物理布局范围减小网络的容错能力提高无需配线间」无需第三层功能管理和故障排除工作简化FaO/22 IF列关于新交换机默认配置的说法中哪三项正确？（选择三项。

1.VLAN 中继有何用途？通过减少广播流量提高网络性能。

选择在交换网络中传输数据的最佳路径。

通过一条链路传送多个VLAN 的流量。

避免交换网络中出现生成树环路。

请参见图示。

两台交换机都配置有默认的网桥优先级。

如果所有链路都在相同的带宽下运行，哪个端口将作为STP 根端口？S1 的Fa0/1 接口S1 的Fa0/2 接口S2 的Fa0/1 接口S2 的Fa0/2 接口请参见图示。

从图中显示的输出可以得到有关STP 的哪两项结论？（选择两项。

）交换机S1 所配置的STP 优先级值在该网络中最低。

交换机S1 被配置为VLAN1 的根桥。

Fa0/21 是交换机S1 的根端口。

Fa0/22 是冗余链路。

Fa0/24 被视为通往根桥的最佳路径。

下列哪种说法正确描述了生成树路径开销？根据环路中连接的交换机总数计算。

根据给定路径上所有交换机的使用率计算。

根据给定路径上交换机的网桥优先级计算。

根据给定路径上每个交换机端口的端口开销值（由端口速度决定）的总和计算。

使用单臂路由器模型配置VLAN 间路由有哪两项要求？（选择两项。

）每个子接口都应配置有自己的IP 地址、子网掩码和唯一的VLAN 分配。

路由器的物理接口必须连接到相邻交换机上的中继链路。

路由器的物理接口数量应该与VLAN 数量匹配。

应该将不同的静态VLAN 分配给路由器的不同接口。

路由器应该配置为VTP 服务器。

请参见图示。

下列哪两项正确描述了图中所示的路由器配置。

（选择两项。

）在路由器上配置路由协议之前，网络192.168.1.0 与网络192.168.3.0 之间无法成功路由。

路由器子接口上未正确配置VLAN。

该配置适用于单臂路由器网络设计。

路由器子接口上未正确配置中继。

应该为接口Fa0/1 分配IP 地址，否则无法进行路由请参见图示。

下列有关交换机S1 配置的说法中哪项正确？端口Fa0/1 和Fa0/3 使用的是Cisco 专有协议。

已使用switchport mode access命令配置交换机的Fa0/1 和Fa0/3 端口。

Which command sequence will enable OSPF in the backbone area for the two Ethernet links on RouterA?RouterA(config)# router ospf 1RouterA(config-router)# network 172.16.4.0 0.0.1.255 area 1RouterA(config)# router ospf 10RouterA(config-router)# network 172.16.4.0 0.0.0.255 area 0RouterA(config-router)# network 172.16.5.0 0.0.0.255 area 0RouterA(config)# router ospf 10RouterA(config-router)# area 0 network 172.16.4.0 0.0.1.255RouterA(config)# router ospf 0RouterA(config-route)# network 172.16.4.0 0.0.255.255 area 0RouterA(config)# router ospf 0RouterA(config-router)# network 172.16.4.0 255.255.255.0RouterA(config-router)# network 172.16.5.0 255.255.255.0RouterA(config)# router ospf 1RouterA(config-router)# network 172.16.4.0 255.255.254.0 area 0How can the OSPF cost for a link be established? (Choose two.)It is set to 1544 by default for all OSPF interfaces.It can be set with the ip ospf cost command.The configured loopback addresses map to link costs.It is calculated proportionally to observed throughput capacity of the router.It may be calculated using the formula 108/bandwidth.Which router command will display the interface priority value and other key information for the OSPF configuration of the serial 0 interface?router# show ospf serial 0router# show interface serial 0 OSPFrouter# show ip interface serial 0router# show ip ospf interface serial 0Because of security concerns, a network administrator wants to set up authentication between two routers. Which of the following commands will configure Router_A to trust Router_B with a clear textRouter_A(config-if)# ospf authentication-key apolloRouter_A(config-if)# ip authentication-key apolloRouter_A(config-if)# ip ospf authentication apolloRouter_A(config-if)# ip ospf authentication-key apolloRouterA, RouterB, and RouterC in the diagram are running OSPF on their Ethernet interfaces. Loopback interfaces (Lo 0) are configured as shown. What happens when RouterD is added to the network?RouterB takes over as DR and RouterD becomes the BDR.RouterD becomes the BDR and RouterA remains the DR.RouterD becomes the DR and RouterA becomes the BDR.RouterC acts as the DR until the election process is complete.RouterD becomes the DR and RouterB remains the BDR.There is no change in the DR or BDR until either current DR or BDR goes down.Refer to the network shown in the diagram. Which command sequence on RouterB will redistribute a Gateway of Last Resort to the other routers in OSPF area 0?RouterB(config)# router ospf 10RouterB(config-router)# gateway-of-last-resort 172.16.6.6RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10RouterB(config-router)# default-information originateRouterB(config)# router ospf 10RouterB(config-router)# default network 172.16.6.6 0.0.0.3 area 0RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10RouterB(config-router)# redistribute ip default-routeWhich of the following should be considered when troubleshooting a problem with the establishment of neighbor relationships between OSPF routers? (Choose three.)OSPF interval timers mismatchgateway of last resort not redistributedinterface network type mismatchno loopback interface configuredadministrative distance mismatchinconsistent authentication configurationIn which types of networks are OSPF DR elections necessary? (Choose two.)point-to-pointpoint-to-multipointbroadcast multiaccessnonbroadcast multiaccessWhat does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)root routerbackup root routerdomain routerbackup domain routerdesignated routerbackup designated routerWhat information can be obtained from the output of the show ip ospf interface command? (Choose three.)link-state age intervalstimer intervalsrouter ID numberlink-state update intervalsneighbor adjacenciesWhich of the following are required when adding a network to the OSPF routing process configuration? (Choose three.)network addressloopback addressautonomous system numbersubnet maskwildcard maskarea IDWhat speeds up convergence in a network using link-state routing?updates triggered by network changesupdates sent at regular intervalsupdates sent only to directly connected neighborsupdates that include complete routing tablesWhy is it difficult for routing loops to occur in networks that use link-state routing?Each router builds a simple view of the network based on hop count.Routers flood the network with LSAs to discover routing loops.Each router builds a complete and synchronized view of the network.Routers use hold-down timers to prevent routing loops.Which router is the root of an SPF tree?border routernearest neighboring routerlocal routertrunk router, as determined by the SPF algorithmWhich of the following are disadvantages of link-state routing? (Choose three.)Link-state protocols require careful network design.Link-state protocols are prone to routing loops.Link-state hello updates can cause broadcast flooding.Link-state protocols place significant demands on router processors and memory resources.Link-state protocols require a knowledgeable network administrator.Link-state protocols do not support Variable Length Subnet Masking.What are the benefits of the hierarchical design approach that is used in large OSPF networks? (Choose three.)reduction of routing overheadincreased routing overheadfaster convergenceslower convergencedistribution of network instability to all areas of the networkisolation of network instability to one area of the networkA network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command will save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area?Router_A(config-router)# ospf redistribute default-routeRouter_B(config-router)# ospf redistribute default-routeRouter_A(config-router)# default-information originateRouter_B(config-router)# default-information originateRouter_A(config-router)# ip ospf update-defaultRouter_B(config-router)# ip ospf update-defaultWhat does OSPF use to calculate the cost to a destination network?bandwidthbandwidth and hop countbandwidth and reliabilitybandwidth, load, and reliablityWhat will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)HQ will be DR for 10.4.0.0/16.Router A will be DR for 10.4.0.0/16.HQ will be BDR for 10.4.0.0/16.Router A will be DR for 10.5.0.0/16.Remote will be DR for 10.5.0.0/16.Remote will be BDR for 10.5.0.0/16.The routers in the diagram are configured as shown. The loopback interface on router R1 is labeled as lo0. All OSPF priorities are set to the default except for Ethernet0 of router R2, which has an OSPF priority of 2. What will be the result of the OSPF DR/BDR elections on the 192.1.1.0 network? (Choose two.)R1 will be the DRR1 will be the BDRR2 will be the DRR2 will be the BDRR3 will be the DRR3 will be the BDR。

1.下列有关网络层编址的陈述中哪三项是正确的?（选择三项。

）网络层编址使用分层式结构。

使用长度为48 位的地址。

以太网交换机可以使用它来作出转发决定。

它不支持广播。

其使用的编址方法可以识别地址的网络部分。

网络层编址可以区分每台主机。

2请参见图示。

网络中的所有设备均使用默认配置。

此拓扑中存在多少个广播域？3579113请参见图示。

主机B 已断电。

交换机的MAC 表将发生什么变化？MAC 表不会受影响。

交换机会在Fa0/19 上删除MAC 地址。

交换机会保留MAC 地址，直到主机B 再次通电。

交换机将通过为端口Fa0/19 分配地址FFF.FFFF.FFFF 来重建MAC表。

4.请参见图示。

为了使此网络中的主机接入Internet，路由器RT_A 需要提供哪种功能？地址转换DHCP 服务ftpWeb 服务器5.哪三个地址属于私有IP 地址？（选择三项。

）10.0.0.1127.0.0.1150.0.0.1172.16.0.1192.168.0.1200.100.50.16请参见图示。

电缆1 和电缆2 分别按照特定的物理层要求接线。

表中按编号列出了每个网段以及该网段中用来连接网络组件的电缆。

哪三个网段安装的电缆是正确的？（选择三项。

）网段1网段2网段3网段4网段5网段67.OSI 模型的哪两项功能在第2 层实现？（选择两项）物理编址编码路由布线介质访问控制8.请参见图示。

网络管理员想通过Modem1 从PC1 远程访问路由器的CLI。

要实现此访问，应将路由器的哪一个端口连接到Modem2？控制台端口以太网端口辅助端口串行端口9请参见图示。

某学生对5e 类电缆两端的接线方法如图所示。

结果是什么？（选择两项）电缆无法使用，必须重新接线。

该电缆适合作为全反电缆使用。

该电缆适合作为快速以太网交叉电缆使用。

该电缆适合作为千兆以太网直通电缆使用。

该电缆适合在支持Auto-MDIX 的两台100 Mbps 交换机之间使用。