思科第2学期答案
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请参见图示。
如果所有路由器都运行RIP 第2 版,为什么没有192.168.1.32/27 网络的路由?Rip 第2 版不会在更新中发送子网掩码。
路由器A 并未将RIP 设置为路由协议。
Rip 第2 版默认将自动总结路由。
路由器B 未设置为通告192.168.1.64/30 网络。
2 points for Option 3请参见图示。
下列哪个路由器上的哪条命令可让Router1 获知192.168.0.0/20 网络?Router1(config)# ip classlessRouter1(config-router)# no passive-interface serial 0/1/1Router2(config-router)# version 2Router2(config-router)# neighbor 10.0.0.22 points for Option 3哪两项是选择实施RIP 第 2 版而不是RIP 第 1 版的原因?(选择两项。
)RIP 第2 版支持VLSM。
RIP 第2 版支持16 台以上的路由器。
RIP 第2 版支持有类(而不是无类)路由RIP 第2 版支持路由更新验证。
RIP 第2 版支持多区域。
RIP 第2 版使用Dijkstra 算法而不是贝尔曼-福特算法。
Option 1 and Option 4 are correct.RIP v1 和RIP v2 的相似点有哪些?(选择三项。
)两者都使用跳数作为度量。
两者对无穷距离使用相同的度量值。
两者都向邻居广播其更新。
两者都在更新中发送子网掩码信息。
两者都对更新来源进行身份验证。
两者都使用水平分割来防止路由环路。
Option 1, Option 2, and Option 6 are correct.请参见图示。
路由器East 和West 被配置为使用RIPv1。
两台路由器都会发送有关其直连路由的更新。
East 路由器可以ping 通West 路由器的串行接口,West 可以ping 通East 的串行接口。
Close WindowAssessment System 1. Assessment Selection 2. Assessment Settings 3. Take Assessment 1Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2? 192.168.1.0/24 192.168.0.0/24 192.168.0.0/22 192.168.1.0/22 2If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from try to load the IOS image first? ROM RAM NVRAM f lash flash TFTP server 3Refer to the exhibit. A network administrator adds this command to router R1: ip route 192.168.2.0 255.255.255.0 S0/0/0. result of adding this command? This route is automatically propagated throughout the network. The traffic for network 172.16.1.0 is forwarded to network 192.168.2.0. A static route is established. A static route is established. The traffic for all Class C networks is forwarded to 172.16.1.2. 4Which two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.) authentication link-state advertisements h old-down timers hold-down timers Spanning Tree Protocol split horizon 5Refer to the exhibit. What information can be determined from the displayed output? E IGRP packets are waiting to be sent to the neighbors. EIGRP packets are waiting to be sent to the neighbors. The adjacencies between the routers are yet to be established. The IP address 192.168.10.10 is configured at serial interface S0/0/1 of router R2. Router R2 is receiving hello packets from a neighbor with the IP address 192.168.10.10 via the R2 S0/0/1 interf6Which statement is true about the metrics used by routing protocols? A metric is a value used by a particular routing protocol to compare paths to remote networks. A metric is a value used by a particular routing protocol to compare paths to remote networks. A common metric is used by all routing protocols. The metric with the highest value is installed in the routing table. The router may use only one parameter at a time to calculate the metric. 7Which feature of RIPv2 enables it to function as a classless routing protocol? Subnet masks are included in routing updates. Routing updates are triggered by topology changes. Next-hop addresses are included in routing updates. N ext-hop addresses are included in routing updates. Multicast addresses are used to send routing updates. 8Refer to the exhibit. The hosts on the R1 LAN are unable to access the Internet. What is incorrectly configured? the IP address of the Fa0/0 interface at R1 t he IP address of the Fa0/0 interface at R1 the IP address of the S0/0/1 interface at R2 the IP address of the S0/0/0 interface at R1 the subnet mask of the S0/0/1 interface at R2 9Which prompt is used to allow a user to change the IP address of an interface on a router? Router> R outer> Router# Router(config)# Router(config-if)# 10Refer to the exhibit. The interfaces of all routers are configured for OSPF area 0. R3 can ping R1, but the two routeestablish a neighbor adjacency. What should the network administrator do to troubleshoot this problem? Check if the interfaces of the routers are enabled. Check the hello and dead intervals between the routers. C heck the hello and dead intervals between the routers. Check the process ID of both routers. Check if CDP is enabled on all the routers. 11Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Route interface in the same network as the serial interface of Router1? IP 172.16.0.18, subnet mask 255.255.255.0 IP 172.16.32.15, subnet mask 255.255.255.240 I P 172.16.32.15, subnet mask 255.255.255.240 IP 172.16.0.18, subnet mask 255.255.255.252 IP 172.16.32.18, subnet mask 255.255.255.252 12Refer to the exhibit. A network engineer has run the show version command on R3. Upon rebooting, R3 does not load configuration settings. What could be the cause of this problem? There is insufficient NVRAM. There is insufficient flash memory. The configuration register is not configured with the default setting. The system image file is not located in NVRAM. 13Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will b routing table? 14Refer to the exhibit. Host A is having problems accessing server A. All routers have the same EIGRP configuration a What should be done so that host A can access server A? Add the command n ono auto-summary on all routers. Change the network statements to include a wildcard mask. Adjust the EIGRP hello timers to account for the network delay. Add the command e igrpeigrp log-neighbor-changes on all routers. 15Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is the routers in this topology will respond to this event? Router4 will learn about the failed route 30 seconds later in the next periodic update. Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expire Router5 immediately flushes the unreachable route from its routing table. Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0. 16A network administrator is in charge of two separate networks that share a single building. What device will be require networks and add a common connection to the Internet that can be shared? hub router access point Ethernet switch E thernet switch 17Refer to the exhibit. A network administrator has configured OSPF using the following command: network 192.168.1.32 0.0.0.31 area 0Which router interface will participate in OSPF? FastEthernet0/0 FastEthernet0/1 Serial0/0/0 Serial0/0/1 18Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the netcommands is required to configure a single area OSPF for the networks that are connected to R2? R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config)# router ospf 2R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 1R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.0.0.0 0.0.0.3 area 119Which two statements are true for link-state routing protocols? (Choose two.) Routers that run a link-state protocol can establish a complete topology of the network. Routers in a multipoint network that run a link-state protocol can exchange routing tables. Routers use only hop count for routing decisions. The shortest path first algorithm is used. Split horizon is used to avoid routing loops. 20Which candidate route has the longest match for a packet with a destination address of 10.30.16.48? 10.30.0.0/16 10.30.15.0/23 10.30.16.0/24 10.30.16.32/27 10.30.16.32/30 21Which statement is true about the RIPv1 protocol? It is a link-state routing protocol. It excludes subnet information from the routing updates. It uses the DUAL algorithm to insert backup routes into the topology table. It uses classless routing as the default method on the router. 22Which of the following are primary functions of a router? (Choose two.) packet switching microsegmentation domain name resolution path selection flow control 23Refer to the exhibit. Partial results of the show running-config and s how show ip route commands are displayed. Router B rec with a destination address of 10.16.1.97. What will router B do? drop the packet forward the packet via the route to 10.16.1.0 f orward the packet via the route to 10.16.1.64 forward the packet via the route to 10.16.1.64 use the default route 24 What are two ways that a router can learn of the paths to destination networks? (Choose two.) updates from other routers DHCP information broadcasts m anual configuration of routes manual configuration of routes ARP requests from connected routers inspection of the destination IP address in data packets updates from the SMTP management information base 25Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this? The IP address of host A is incorrect. The default gateway of host A is incorrect. The Fa0/1 interfaces of the two routers are configured for different subnets. T he Fa0/1 interfaces of the two routers are configured for different subnets. The subnet mask for the Fa0/0 interface of R1 is incorrect. 26A network administrator is analyzing routing update behavior on a network that has both EIGRP and OSPF configured protocols appear in the output of show ip protocols. However, only EIGRP internal routes appear in the routing tables. correctly explains the scenario? The OSPF protocol has a higher cost than EIGRP. T he OSPF protocol has a higher cost than EIGRPThe EIGRP protocol has a lower metric than OSPF. The EIGRP protocol was configured first on the router. The EIGRP protocol has a lower administrative distance than OSPF. 27Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are d are operational and pings are not blocked on this network. Which ping will fail? from R1 to 172.16.1.1 from R1 to 192.168.3.1 from R2 to 192.168.1.1 from R2 to 192.168.3.1 28Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which two de this? (Choose two.) a CSU/DSU device a modem a n Ethernet switch an Ethernet switch a hub a bridge 29 In which situation would a default static route be recommended? when connecting an edge router to the Internet w hen variable length subnet masking is in effect when variable length subnet masking is in effect when there is more than one valid route for a destination network when a destination network has a larger mask than any routes in the routing table 30 Two routers need to be configured within a single OSPF area. Which two components need to be configured on boththis? (Choose two.) t he same process ID the same process ID the same area ID network addresses and wildcard masks the same router ID the same loop back address 231Refer to the exhibit. What is the meaning of the highlighted value 120? It is the metric that is calculated by the routing protocol. It is the value that is used by the DUAL algorithm to determine the bandwidth for the link. It is the administrative distance of the routing protocol. It is the hold-down time, measured in seconds, before the next update. 32Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip database However, upon running the show ip route command, the network administrator sees that the router has installed a diff command, the network administrator sees that the router has installed a diffe 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route? Compared to RIP, EIGRP has a lower administrative distance. Compared to EIGRP , RIP has a higher metric value for the route. Compared to RIP , the EIGRP route has fewer hops. Compared to RIP , EIGRP has a faster update timer. 33 Which mechanism helps to avoid routing loops by advertising a metric of infinity? route poisoning split horizon hold-down timer triggered updates 34 A network administrator must use the subnet 172.16.128.0/18 to create 6 additional subnets each containing up to 20LANs. Which subnet mask should the administrator use to create the new subnets? 255.255.224.0 255.255.240.0 255.255.248.0 255.255.252.0 35 A technician configures the Fa0/0 interface on a router with ip address 192.168.3.5 255.255.255.252. What additional com. What additional com issued by the technician to activate the interface to forward traffic? Router(config-if)# exitRouter(config-if)# no shutdownRouter(config-if)# clock rateRouter# copy running-config startup-config36 Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can a altered to accommodate a topology change? Keep the existing static route and configure a new static route with the correct next hop IP address. Negate the existing static route and configure a new static route with the correct next hop IP address. D o nothing. The existing static route will automatically update the next hop entry with the new IP address. Do nothing. The existing static route will automatically update the next hop entry with the new IP address. Keep the existing static route, reload the router, and configure a new static route with the correct next hop IP a37Refer to the exhibit. What needs to be done to allow these two routers to connect successfully? Add a clock rate to S0/0/0 on R1. Add an interface description to S0/0/1 on R2. C hange the serial interface on R2 to S0/0/0 so that it matches R1. Change the serial interface on R2 to S0/0/0 so that it matches R1. Change the IP address of S0/0/1 on R2 so that it is in the same subnet as R1. 38Refer to the exhibit. The network administrator has run the following command on R1. R1(config)# ip route 192.168.2.0 255.255.255.0 172.16.1.2What is the result of running this command? Traffic for network 192.168.2.0 is forwarded to 172.16.1.2. This route is automatically propagated throughout the entire network. Traffic for all networks is forwarded to 172.16.1.2. The command invokes a dynamic routing protocol for 192.168.2.0. 39 Why is fast convergence desirable in networks that use dynamic routing protocols? Hosts are unable to access their gateway until the network is converged. Routers will not allow packets to be forwarded until the network is converged. Routers may make incorrect forwarding decisions until the network has converged. Routers will not allow configuration changes to be made until the network has converged. 40Refer to the exhibit. When all of the commands that are shown in the exhibit are entered at the correct router promp the router? name cisco router hostname 41Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (C10.0.0.0/8 64.100.0.0/16 128.107.0.0/16 172.16.40.0/24 192.168.1.0/24 192.168.2.0/24 42Refer to the exhibit. A router interface is configured with the command ip address 172.16.3.31 255.255.192.0. Which set o. Which set o values would allow a computer that is connected to the router interface to communicate with remote networks? A: 172.16.3.254 A: 172.16.3.254 B: 255.255.192.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.192.0 C: 172.16.3.255 A: 172.16.3.254 B: 255.255.255.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.255.0 C: 172.16.3.1 43Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through three.) The router modifies the TTL field, decrementing it by one. The router changes the source IP to the IP of the exit interface. The router maintains the same source and destination IP. The router changes the source physical address to the physical address of the exit interface. The router changes the destination IP to the IP of the exit interface. The router sends the packet out all other interfaces, besides the one it entered the router on. 44Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.) The route to network 172.16.0.0 has an AD of 156160. Network 192.168.0.16 can best be reached using FastEthernet0/0. The AD of EIGRP routes has been manually changed to a value other than the default value. Router1 is running both the EIGRP and OSPF routing process. Network 172.17.0.0 can only be reached using a default route. No default route has been configured. N o default route has been configured. 45Refer to the exhibit. Which route will be installed in the routing table on R1 to forward traffic from PC1 to the web s the static route the route learned via OSPF the route learned via EIGRP both routes learned via OSPF and EIGRP 46Refer to the exhibit. Based on the partial output in the exhibit, why can users establish a console connection to this r a password? The login command was not entered on the console line. The enable password should be an enable secret password. No username and password combination has been configured. Console connections cannot be configured to require users to provide passwords. 47Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network? ADC ABC It will load balance the traffic between ADC and ABC It will send the traffic via ABC, and will use ADC as a backup path only when ABC fails. 48A router learns about network 192.168.10.128/27 from multiple sources. Which option represents the best route and w routing table? S 192.168.10.128/27 [1/0] via 192.168.10.226 R 192.168.10.128/27 [120/2] via 192.168.10.226, 00:00:14, Serial0/0/0 O 192.168.10.128/27 [110/1563] via 192.168.10.226, 00:00:09, Serial0/0/0 D 192.168.10.128/27 [90/21026560] via 192.168.10.226, 00:00:16, Serial0/0/0 49Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly cothe routing table. What is the likely cause? The adjacent interfaces are passive. The distance of 120 exceeds 15 hops. R2 will not accept version 1 updates from R1. Routes are being summarized by R1 but not by R2. 50It is saved in the topology table for use if the primary route fails. It may be backed up by a feasible successor route. It is used by EIGRP to forward traffic to the destination. It is flagged as active in the routing table. After the discovery process has occurred, the successor route is stored in the neighbor table. 51Refer to the exhibit. PC1 is unable to access the Internet. What is the cause of the problem? An incorrect IP address is configured between the two routers. No static route is configured on Router2. A routing loop has occurred. No routing protocol is configured on either of the two routers. 52Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that inte FastEthernet0/1 is not functioning. Which action will most likely correct the problem with FastEthernet0/1? A clock rate should be added to the interface configuration. The subnet mask should be added to the interface configuration. An interface description needs to be added to the interface configuration. The no shutdown command needs to be added to the interface configuration. 。
客户向ISP 技术人员反映连通性问题。
技术人员就相关问题询问客户之后,发现除了FTP 外,所有网络应用程序都正常。
技术人员怀疑出现了什么问题?防火墙配置有误/ 交换机或集线器端口损坏)/I n t e r n e t服务器将把数据发送至客户端端口8547。
/ 端口过滤和访问列表通过什么方式来增强网络安全?防止特定类型的通信到达特定网络主机。
/遭受各类拒绝服务攻击时提醒网络管理员。
防止病毒、蠕虫和特洛伊木马感染主机计算机和服务器。
可对机密数据通信进行加密和身份认证。
某黑客尝试获取存储在公司网络内部某台服务器上的机密信息。
网络安全解决方案检测完整的数据包,确定这是一个威胁,所以阻止该数据包进入内部网络。
这一过程中哪项安全措施保护了网络?IDSIPS /基于主机的防火墙此命令是从哪一台路由器执行的?ABC /D请参见图示。
网络管理员使用以下命令在RTB 上配置了一条默认路由:RTB(config)# ip route 0.0.0.0 0.0.0.0 fa0/0PC3 可以成功ping 通RTB。
但是当从PC3 发出的回应请求数据包到达PC1 后,却没有应答返回PC3。
怎样解决此问题?必须对RTA 进行配置,使其可以将数据包转发至192.168.2.0 网络。
需要修改ip route 命令,以便将下一跳地址设置为10.1.1.5。
/OSPFEIGRPRIPBGP /下列关于FTP 协议被动数据连接的说法中哪一项正确?服务器发起数据传输连接。
服务器将其IP 地址和一个随机端口号通过控制流转发给FTP 客户端。
/防火墙不会允许与网络内的主机进行被动数据连接。
客户端将数据转发至服务器的端口21。
下列关于反向查找DNS 区域的说法中哪一项正确?将会降低网络速度。
可对传输中的数据进行加密。
当路由协议交换有关直连网络的信息时,哪种路由将自动添加到邻居路由器的路由表中?动态路由/静态路由默认路由直连路由哪项网络地址和子网掩码的组合可使每个子网连接62 台主机?网络地址10.1.1.4 子网掩码255.255.255.240网络地址10.1.1.0 子网掩码255.255.255.252网络地址10.1.1.0 子网掩码255.255.255.192 /是一种可靠的传输协议。
1 请参见图示。
交换机为主机执行连接到VLAN 5 的路由。
如果 PC 从 Internet 访问 Web 服务器,那么在哪个点上会向该帧添加一个 VLAN 编号?点A 点B 点C 点D点E无 VLAN 编号添加到此设计中的帧。
答案 答案 最高分值correctness of response Option 622哪种类型的 VLAN 间通信设计需要配置多个子接口?单臂路由器通过多层交换机路由管理 VLAN 的路由传统 VLAN 间路由答案 答案 最高分值correctness of response Option 123使用单臂路由器 VLAN 间路由的缺点是什么?不支持 VLAN 标记的数据包比传统 VLAN 间路由要求使用更多的物理接口规模扩展不超过 50 个VLAN需要将配置的多个路由器接口用作接入链路答案 答案 最高分值correctness of response Option 324在多层交换机的多个 VLAN 之间,流量如何路由?流量通过物理接口路由。
流量通过内部 VLAN 接口路由。
流量从所有物理接口广播出去。
流量通过子接口路由。
答案 答案 最高分值correctness of response Option 225 规模较小的大学的教室网络使用 VLAN 10,办公室网络使用 VLAN 20。
在使用传统 VLAN 间路由时,需要使用什么来启用这两个 VLAN 之间的通信?应使用至少有两个 LAN 接口的路由器。
需要两组交换机,每个端口配置一个 VLAN 。
需要有一个 VLAN 接口的路由器连接到交换机的 SVI 。
需要将配置为中继的有一个端口的交换机连接到一个路由器上。
答案 答案 最高分值correctness of response Option 126下列哪种说法正确描述了使用路由器子接口进行 VLAN 间路由的缺点?比起使用单个路由器接口,费用更为昂贵。
在单个路由器接口上,路由流量必须争用带宽。
1 企业级设备的哪两个功能有助于企业网络维持 99.999% 的正常运行?(请选择两项。
)故障切换功能折叠核心冗余电源故障域服务模块答案说明最高分值correctness of response Option 1 and Option 3 are correct. 22请参见图示。
当交换机 S3 断电时,故障域中存在哪些设备?S4 和PC_2PC_3 和AP_2AP_2 和 AP_1PC_3 和PC_2S1 和 S4答案说明最高分值correctness of response Option 2 23 哪个设计特点将限制企业网络中故障域的大小?使用折叠核心设计使用建筑物交换块方法安装冗余电源购买专门用于大流量的企业设备答案说明最高分值correctness of response Option 2 24 企业网络如何设计才能优化带宽?安装具备故障切换功能的设备限制故障域的大小部署折叠核心模型组织网络以控制流量模式答案说明最高分值correctness of response Option 4 25 当设计交换网络包含冗余链路时,需要哪种技术?链路聚合生成树协议虚拟专用网络虚拟 LAN答案说明最高分值correctness of response Option 2 26 网络管理员正在规划交换网络中的冗余设备和布线来支持高可用性。
实施生成树协议对此设计有什么好处?多个物理接口可以合并到一个 EtherChannel 接口。
冗余路径可用,且不会引起第 2 层逻辑环路。
网络访问可以进行扩展,以支持有线和无线设备。
高级路由协议可以实现快速融合。
答案说明最高分值correctness of response Option 2 27 通过无线介质扩展接入层的用户访问有哪两个好处?(请选择两项。
)提高灵活性减少关键故障点次数降低成本提高带宽可用性增强网络管理选项答案说明最高分值correctness of response Option 1 and Option 3 are correct. 28 作为一名网络管理员,您需要在公司网络上实施 EtherChannel。
客户向ISP 技术人员反映连通性问题。
技术人员就相关问题询问客户之后,发现除了FTP 外,所有网络应用程序都正常。
技术人员怀疑出现了什么问题?防火墙配置有误/交换机或集线器端口损坏客户工作站上的IP 地址配置有误客户工作站上的DNS 服务器配置有误客户工作站上的默认网关配置有误请参见图示。
对于图中所示的数据会话,下列哪两项描述正确?(选择两项。
)数据会话由客户端所运行的HTTP 应用程序进程启动。
/数据会话由客户端的TCP 端口80 标识。
用户通过发送电子邮件启动数据会话。
Internet 服务器的IP 地址是192.168.17.43。
Internet 服务器将把数据发送至客户端端口8547。
/端口过滤和访问列表通过什么方式来增强网络安全?防止特定类型的通信到达特定网络主机。
/遭受各类拒绝服务攻击时提醒网络管理员。
防止病毒、蠕虫和特洛伊木马感染主机计算机和服务器。
可对机密数据通信进行加密和身份认证。
某黑客尝试获取存储在公司网络内部某台服务器上的机密信息。
网络安全解决方案检测完整的数据包,确定这是一个威胁,所以阻止该数据包进入内部网络。
这一过程中哪项安全措施保护了网络?IDSIPS /基于主机的防火墙Anti-X 软件192.168.17.111/28 属于哪一类地址?主机地址网络地址广播地址 /组播地址在图中所示的其中一台路由器上执行 show ip route 命令,显示下列输出:C 192.168.4.0/24 is directly connected, Serial0/0R 192.168.5.0/24 [120/1] via 192.168.4.2, 00:00:19, Serial0/0R 192.168.1.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1 R 192.168.2.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1C 192.168.3.0/24 is directly connected, Serial0/1此命令是从哪一台路由器执行的?ABC /D请参见图示。
第一章路由和数据包转发介绍1.哪两项说法正确描述了路由器的组件?(选择两项)(B、D)A.RAM 永久存储着在启动过程中使用的配置文件B.ROM 含有硬件模块所执行的诊断程序C.NVRAM 存储着在启动过程中使用的IOS 的备份副本D.重新启动时闪存中的内容不会丢失E.ROM 包含最新而且最完整的IOS 版本F.闪存包含用于标识IOS 位置的启动系统命令2.图中的哪些接口可用于租用线路WAN 连接?(选择两项)(A、D)A.1B.2C.3D.4E.5F.63.如果路由器在启动时无法找到有效的配置文件,将发生什么情况?(B)A.启动过程将重置B.路由器将提示用户进行响应,以进入设置模式C.启动过程将停止,直到获得有效的配置文件D.路由器将根据上次的有效配置生成默认配置文件E.路由器将监控本地流量,以确定路由协议配置要求4.以下哪一项正确描述了路由器启动时的顺序?(A)A.加载bootstrap、加载IOS、应用配置B.加载bootstrap、应用配置、加载IOSC.加载IOS、加载bootstrap、应用配置、检查硬件D.检查硬件、应用配置、加载bootstrap、加载IOS5.加载配置文件时的默认顺序是怎样的?(C)A.NVRAM、FLASH、ROM B.FLASH、TFTP、CONSOLE C.NVRAM、TFTP、CONSOLE D.FLASH、TFTP、ROM 6.在启动过程中,路由器可以从哪些位置加载Cisco IOS?(选择两项)(B、E)A.RAM B.TFTP 服务器C.NVRAM D.设置例程E.闪存F.终端7.下列哪些是路由器的功能?(选择三项)(A、C、D)A.分组交换B.网段扩展C.广播域分段D.根据逻辑编址选择最佳路径E.根据物理编址选择最佳路径8.当路由器收到从一个网络发往另一个网络的数据包时,它会执行哪三个过程?(选择三项)(A、D、E)A.通过解开第2 层帧报头来解封第3 层数据包B.通过IP 报头中的目的MAC 地址在路由表中查找下一跳地址C.解封第3 层数据包时将第2 层帧报头保持原样D.通过IP 报头中的目的IP 地址在路由表中查找下一跳地址E.将第3 层数据包封装成新的第2 层帧,并将该帧从送出接口转发出去F.将第3 层数据包封装成特殊的第1 层帧,并将该帧转发到送出接口9.网络管理员需要通过路由器的FastEthernet 端口直接连接两台路由器。
1下列有关实施 VLAN 的说法中,哪两项正确?(选择两项。
)冲突域的大小会减小。
网络中所需交换机的数量会减少。
VLAN 会对主机进行逻辑分组,而不管它们的物理位置如何。
由于增加了中继信息,网络负载会显著增加。
某一 VLAN 中的设备不会收到其它 VLAN 中的设备所发出的广播。
答案 答案 最高分值correctness of response Option 3 and Option 5 are correct.22下列哪三项陈述准确描述了 VLAN 类型?(请选择三项。
)管理 VLAN 是指经过配置可以访问交换机管理功能的任何 VLAN 。
数据 VLAN 用于传输 VLAN 管理数据和用户生成的流量。
未经配置的交换机初始启动后,所有端口都属于默认 VLAN 。
已分配本地 VLAN 的 802.1Q 中继端口同时支持标记流量和无标记流量。
语音 VLAN 用于支持网络中的用户电话和电子邮件流量。
VLAN 1 总是用作管理 VLAN 。
答案答案最高分值 correctness ofresponse Option 1, Option 3, and Option 4 are correct.33网络管理员正在确定 VLAN 中继链路的最佳位置。
哪两种类型的点对点连接会使用 VLAN 中继两项。
)使用多个 VLAN 的两台交换机之间交换机和客户端 PC 之间交换机和带有 802.1Q 网卡的服务器之间交换机和网络打印机之间共享同一 VLAN 的两台交换机之间答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.24请参见图示。
某帧在 PC-A 与 PC-B 之间传输。
下列有关此帧 VLAN 标记的说法中,哪项是正确的?当此帧离开 PC-A 时,会被添加 VLAN 标记。
当交换机接收此帧时,此帧会被添加 VLAN 标记。
当此帧从端口转出至 PC-B 时,会被添加 VLAN 标记。
1以下命令的结果是什么ORL(config)# interface fastethernet 0/0ORL(config-if)# ip addressORL(config-if)# no shutdown任何动态路由协议都将自动路由网络。
将为网络创建一条带有代码“C”的路由表条目。
需要一条静态路由才能将流量路由到网络。
该命令将自动保存到 startup-configuration。
22请参见图示。
Router1 和 Router2 都运行 EIGRP。
所有接口都正常运行,并且数在所有网络之间转发。
在 Router1 的路由表中可找到下列哪一项信息Router1 有 6 个直连网络。
到达网络的路由的管理距离为 90。
到达的路由的度量为 1。
用于将数据包转发到的接口始终为 S0/1 接口。
33关于使用静态路由的优点,下列哪两项描述正确(选择两项。
)安全性更高配置路由的工作量更少管理员保持对路由的控制在不断扩展的网络中更容易实施降低了路由出错的几率提高了路由资源的使用率4下列哪项说法正确描述了距离矢量路由协议的工作情况使用跳数作为唯一度量。
仅在添加了新网络时发送更新。
将路由表发送给直连的邻居。
将路由更新发送到整个网络。
请参见图示。
下列关于 R1 如何确定与 R2 之间最佳路径的陈述中,哪一项正确R1 会将使用网络 A 的 RIP 路由加入路由表,因为 RIP 的管理距离比 EIGRR1 会将使用网络 A 的 RIP 路由加入路由表,因为 RIP 的路径开销比 EIGRR1 会将使用网络 B 的 EIGRP 路由加入路由表,因为 EIGRP 的管理距离比R1 会将使用网络 B 的 EIGRP 路由加入路由表,因为 EIGRP 的路径开销比R1 会将 EIGRP 路由和 RIP 路由加入路由表,并在它们之间实施负载均衡。
6一家发展中的中型制造企业最近开始出现路由不稳定的问题。
该企业使用静态路Cisco 路由器和非 Cisco 的路由器共 30 多台。
1请参见图示。
下列哪组设备仅包含中间设备?A、B、D、GA、B、E、FC、D、G、IG、H、I、J2您所在的网际网络发生了路由问题。
要鉴别此错误,应该检查以下哪种类型的设备?接入点主机集线器路由器交换机3请参见图示。
技术人员正在处理网络问题,需要验证路由器的LAN 接口。
要确认路由器接口工作正常,应该从此主机ping 哪个地址?127.0.0.1192.168.64.196192.168.254.1192.168.254.9192.168.254.2544下列哪三项陈述说明了传输层协议的特征?(选择三项)应用层协议使用TCP 端口号和UDP 端口号。
TCP 使用端口号提供可靠的IP 数据包传输。
UDP 使用窗口和确认获得可靠的数据传输。
TCP 使用窗口和定序提供可靠的数据传输。
TCP 是面向连接的协议。
UDP 是无连接协议。
5OSI 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6由于发生安全规规事件,必须更改路由器口令。
从以下配置项可获知什么信息?(选择两项。
)Router(config)#line vty 0 3Router(config-line)# password c13c0Router(config-line)#login这些配置项对远程访问指定了三条Telnet 线路。
这些配置项对远程访问指定了四条Telnet 线路。
这些配置项将控制台口令和Telnet 口令设置为"c13c0"。
因为Telnet 配置不完整,所以Telnet 访问将遭到拒绝。
允许使用"c13c0" 作为口令访问Telnet。
7请参见图示。
电缆1 和电缆2 的两端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网络技术人员在该网段不同网络组件之间已经安装的电缆。
根据给定的数据回答,哪些网段的电缆安装正确?(选择三项)网段1网段2网段3网段4网段58下列哪种提示符代表适合copy running-config startup-config命令使用的模式?Switch-6J>Switch-6J#Switch-6J(config)#Switch-6J(config-if)#Switch-6J(config-line)#9请参见图示。
1
下列哪两种网络设计功能需要生成树协议 (STP)
来确保正确的网络操作?(请选择两项。
)
静态默认路由
实施 VLAN 以包含广播
第 2 层交换机之间的冗余链路
提供冗余路由的链路状态动态路由
消除多个第 2 层交换机的单点故障
答案 说明 最高分值
correctness of response Option 3 and Option 5 are correct. 2
2
第 2 层环路有什么特征?
广播帧转发回发送方交换机。
帧的生存时间属性设置为无限。
路由器连续向其他路由器转发数据包。
交换机连续转发相同的单播帧。
答案 说明 最高分值
correctness of response Option 1
2
3
第 2 层广播风暴的结果是什么?
交换机拥塞时,路由器将接管转发帧的角色。
新的流量将会被交换机因无法处理而丢弃。
CSMA/CD 将使每台主机继续传输帧。
ARP 广播请求返回发送方主机。
答案 说明 最高分值
correctness of response Option 2
2
4
哪种信息包含 BPDU 中的 12 位扩展系统 ID ?
MAC 地址
VLAN ID
IP 地址
端口 ID
答案 说明 最高分值
correctness of response Option 2
2
5
下列哪三个部分可以组合形成网桥 ID ?
端口
ID
IP 地址
扩展系统
ID
MAC 地址
网桥优先级
开销
答案
说明
最高分值 correctness of
response Option 3, Option 4, and Option 5 are correct.
3
6
哪个 STP 优先级配置可以确保交换机始终是根交换机?
spanning-tree vlan 10 priority 0
spanning-tree vlan 10 priority 61440
spanning-tree vlan 10 root primary
spanning-tree vlan 10 priority 4096
答案 说明 最高分值
correctness of response Option 1
2
7
下列哪种协议提供多达 16 个 RSTP 实例,能将具有相同物理和逻辑拓扑的多个 VLAN 结合为实例,并为 PortFast 、BPDU 防护和 BPDU 过滤、根防护和环路防护提供支持?
STP
快速
PVST+
PVST+ MST
答案 说明 最高分值
correctness of response Option 4
2
8
由于假设整个桥接网络中只有一个生成树实例,哪两种生成树协议可能导致不理想的数据流?项。
)
STP
快速
PVST+ PVST+
MSTP
RSTP
答案说明最高分值
correctness of response
Option 1 and Option 5 are correct.
2
9
PVST+ 有什么优势?
PVST+ 可减少网络中所有交换机的 CPU 周期。
与使用 CST 的传统 STP 实施相比,PVST+ 可减少带宽消耗。
PVST+ 通过自动选择根网桥来优化网络性能。
PVST+ 通过负载共享优化网络性能。
答案说明最高分值
correctness of response Option 4 2
10
在哪两种端口状态下交换机会获取 PVST 网络中的 MAC 地址和流程 BPDU
?(请选择两项。
)阻塞
禁用
转发
获知
监听
答案说明最高分值
correctness of response Option 3 and Option 4 are correct. 2
11
如果 PVST 中没有配置网桥优先级,那么在选举根网桥时会考虑什么条件?
最低 IP 地址
最低 MAC 地址
最高 IP 地址
最高 MAC 地址
12
下列哪个 RSTP 端口连接到终端设备?
中继端口
指定端口
根端口
边缘端口
答案
说明 最高分值
correctness of response Option 4 2
13
网络管理员准备在生产网络中实施快速 PVST+。
如何确定交换机接口上的快速 PVST+
链路类
链路类型自动确定。
链路类型必须使用特定端口配置命令进行配置。
链路类型只能在配置 PortFast 后确定。
链路类型只能在配置了单个 VLAN 的接入端口上配置。
答案 说明 最高分值
correctness of response Option 1 2
14
当配置为 PortFast 时,交换机端口会立即转换到哪种端口状态?
监听
获知 转发
阻塞
答案 说明 最高分值
correctness of response Option 3 2
15
为了了解交换网络中的生成树状态的大致情况,网络工程师在交换机上发出 show spanning-tree 命令。
此命令会显示哪两项信息?(请选择两项。
)
根网桥的 BID 。
所有 VLAN 中的端口角色。
本征 VLAN 端口的状态。
每个根端口收到的广播数量。
管理 VLAN 接口的 IP 地址。
答案 说明 最高分值
correctness of response
Option 1 and Option 2 are correct. 2
16
HSRP 有何用途?
当路由器发生故障时,它将提供持续的网络连接。
它可以防止非法交换机成为 STP 根。
它可以使接入端口立即转换到转发状态。
它可以防止恶意主机连接到 TRUNK 端口。
答案 说明 最高分值
correctness of response Option 1 2
17
下列哪种非专有协议能够为支持 IPv4 LAN 的一组路由器提供路由器冗余?
HSRP
VRRPv2 GLBP
SLB
答案 说明 最高分值
correctness of response Option 2 2
18
请参见图示。
输出显示哪种协议信息?
FHRP
GLBP
HSRP
VRRP
答案说明最高分值
correctness of response Option 2 2
19
请参见图示。
网络工程师正在对使用第一跳冗余协议的 LAN 上主机连接的问题进行故障排除。
应在主机上配置哪个 IPv4 网关地址?
192.168.2.0
192.168.2.1
192.168.2.2
192.168.2.100
答案说明最高分值
correctness of response Option 4 2
20
填空题。
请勿使用缩写。
spanning-tree
启用快速 PVST+。
正确答案: mode rapid-pvst
21
填空题。
在 FHRP 运行过程中,两台或多台路由器显示为单个
正确答案: 虚拟
23
The PT initialization was skipped. You will not be able to view the PT activity. 打开 PT 练习。
执行练习说明中的任务,然后回答问题。
哪个交换机是根网桥?
Switch_1
Switch_2
Switch_3
Switch_4
答案 说明 最高分值
correctness of response Option 4 2。