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CCNA(200-301)题库及答案

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Exam AQUESTION 1A network engineer must create a diagram of a multivendor network.which command must be configured on the Cisco devices so that the topology of the network can be mapped?A.Device(config)#lldp runB.Device(config)#cdp runC.Device(config)# cdp enableD.Device(config)# flow-sampler-map topologyCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 2Which feature on the Cisco Wireless LAN Controller when enabled restricts management access from specific networks?A.CPU ACLB.TACACSC.Flex ACLD.RADIUSCorrect Answer: ASection: (none)ExplanationExplanation/Reference:Reference:https:///c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.htmlQUESTION 3When a site-to-site VPN is used, which protocol is responsible for the transport of user data?A.IKEv2B.IKEv1C.IPsecD.MD5Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 4How do TCP and UDP differ in the way that they establish a connection between two endpoints？A.TCP use the three-way handshake,and UDP dose no guarantee message deliveryB.TCP use synchronization packets,and UDP uses acknowledgement packetsC.UDP provides reliable message transfer,and TCP is a connectionless protocol.D.UDP use SYN,SYN ACK,and FIN bits in the frame header while TCP uses SYN,SYN ACK,and ACK bis.Correct Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 5What are two reasons that cause late collisions to increment on an Ethernet interface?(choose two)A.when the sending device waits 15 seconds before sending the frame againB.when the cable length limits are exceededC.when one side of the connection is configured for half-duplexD.when Carner Sense Multiple Access/Collision Detection is usedE.when a collision occurs after the 32nd byte of a frame has been transmittedCorrect Answer: BDSection: (none)ExplanationExplanation/Reference:QUESTION 6A Cisco IP phone receive untagged data traffic from an attached PC. Which action is taken by the phone?A.It allows the traffic to pass through unchangedB.It drops the trafficC.It tags the traffic with the default VLAND.It tags the traffic with the native VLANCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 7Refer to the exhibit. The show ip ospf interface command has been executed on R1 How is OSPF configured?A.The interface is not participating in OSPFB.A point-to-point network type is configuredC.The default Hello and Dead timers are in useD.There are six OSPF neighbors on this interfaceCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 8What benefit does controller-based networking provide versus traditional networking?A.provides an added layer of security to protect from DDoS attacksbines control and data plane functionality on a single device to minimize latencyC.moves from a two-tier to a three-tier network architecture to provide maximum redundancyD.allows configuration and monitoring of the network from one centralized pointCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 9When a floating static route is configured, which action ensures that the backup route is used when the primary route fails?A.The floating static route must have a higher administrative distance than the primary route so it is used as a backupB.The administrative distance must be higher on the primary route so that the backup route becomes secondary.C.The floating static route must have a lower administrative distance than the primary route so it is used as a backupD.The default-information originate command must be configured for the route to be installed into the routing tableCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 10Which mode must be used to configure EtherChannel between two switches without using a negotiation protocol?A.onB.autoC.activeD.desirableCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 11What are two descriptions of three-tier network topologies? (Choose two.)A.The distribution layer runs Layer 2 and Layer 3 technologies.B.The network core is designed to maintain continuous connectivity when devices fail.C.The core layer maintains wired connections for each host.D.The core and distribution layers perform the same functionsE.The access layer manages routing between devices in different domains.Correct Answer: ABSection: (none)ExplanationExplanation/Reference:QUESTION 12Refer to the exhibit.which statement explains the configuration error message that is received?A.it belongs to a private IP address rangeB.the router dose not support /28 maskC.it is a network IP addressD.it is a broadcast IP addressCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 13what is the expected outcome when an EUI-64 address is generated?A.The seventh bit of original MAC address of the interface is invertedB.The interface ID is configured as a random 64-bit valueC.The characters FE80 are inserted at the beginning of the MAC address of the interfaceD.The MAC address of the interface is used as the interface ID without modificationCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 14Which function does an SNMP agent perform?A.It manages routing between Layer 3 devices in a network,B.It coordinates user authentication between a network device and a TACACS+ or RADIUS server.C.It sends information about MIB variables in response to requests from the NMS.D.It requests information from remote network nodes about catastrophic system events.Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 15Refer to the exhibit.The default-information originate command is configured under the R1 OSPF configuration.After testing,workstation on VLAN 20 at Site B cannot reach a DNS server on the Internet.wihch action corrects the configuration issue?A.Add the default-information originate command on R2B.Add the always keyword to the default-information originate command on R1C.Configure the ip route 0.0.0.0 0.0.0.0 10.10.10.18 command on R1D.Configure the ip route 0.0.0.0 0.0.0.0 10.10.10.2 command on R2Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 16What are two benefits of network automation? (Choose two)A.reduced operational costsB.reduced hardware footprintC.faster changes with more reliable resultsD.fewer network failuresE.increased network securityCorrect Answer: ACSection: (none)ExplanationExplanation/Reference:QUESTION 17Which two command sequences must you configure on a switch to establish a Layer 3 EtherChannel with an open-standard protocol?(choose two) A.interface GigabitEthernet0/0/1Channel-group 10 mode activeB.interface GigabitEthernet0/0/1Channel-group 10 mode autoC.interface GigabitEthernet0/0/1Channel-group 10 mode onD.interface port-channel 10no switchportip address 172.16.0.1 255.255.255.0E.interface port-channel 10switchportSwitchport mode trunkCorrect Answer: ADSection: (none)ExplanationExplanation/Reference:QUESTION 18Which command prevents passwords from being stored in the configuration as plaintext on a router or switch?A.enable secretB.service password-encryptionername Cisco password encryptD.enable passwordCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 19R1 has learned route 10.10.10.0/24 via numerous routing protocols,which route is installed?A.route with the lowest costB.route with the shortest prefix lengthC.route with the next hop that has the highest IPD.route with the lowest administrative distanceCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 20which network allows devices to communicate without the need to access the internet?A.172.9.0.0/16B.172.28.0.0/16C.192.0.0.0/18D.209.165.201.0/24Correct Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 21Which attribute does a router use to select the best path when two or more different routes to the same destination exist from two different routing protocols?A.dual algorithmB.metricC.administrative distanceD.hop countCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 22which command must be entered when a device is configured as an NTP server?A.ntp masterB.ntp severC.ntp authenticateD.ntp peerCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 23When OSPF learns multiple paths to a network, how does it select a route?A.It multiple the active K value by 256 to calculate the route with the lowest metric.B.For each existing interface, it adds the metric from the source router to the destination to calculate the route with the lowestbandwidth.C.It divides a reference bandwidth of 100 Mbps by the actual bandwidth of the existing interface to calculate the router with the lowestcost.D.It count the umber of hops between the source router and the destination to determine the router with the lowest metricCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 24What is a characteristic of spine-and-leaf architecture?A.It provides variable latency.B.Each link between leaf switches allows for higher bandwidth.C.Each device is separated by the same number of hops.D.It provides greater predictability on STP blocked ports.Correct Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 25Which two outcomes are predictable behaviors for HSRP? (Choose two)A.The two routers share a virtual IP address that is used as the default gateway for devices on the LAN.B.The two routers negotiate one router as the active router and the other as the standby routerC.Each router has a different IP address both routers act as the default gateway on the LAN, and traffic is load balanced betweenthem.D.The two routers synchronize configurations to provide consistent packet forwardingE.The two routed share the same IP address, and default gateway traffic is load-balanced between themCorrect Answer: ABSection: (none)ExplanationExplanation/Reference:QUESTION 26Which action must be taken to assign a global unicast IPv6 address on an interface that is derived from the MAC address of that interface?A.explicitly assign a link-local addressB.disable the EUI-64 bit processC.enable SLAAC on an interfaceD.configure a stateful DHCPv6 server on the networkCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 27Refer to the exhibit. What is the effect of this configuration?A.The switch port interface trust state becomes untrustedB.The switch port remains administratively down until the interface is connected to another switchC.Dynamic ARP inspection is disabled because the ARP ACL is missingD.The switch port remains down until it is configured to trust or untrust incoming packetsCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 28In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?A. A spine switch and a leaf switch can be added with redundant connections between themB. A spine switch can be added with at least 40 GB uplinksC. A leaf switch can be added with connections to every spine switchD. A leaf switch can be added with a single connection to a core spine switchCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 29Refer to the exhibit.Router R1 is running three different routing protocols.Which route characteristic is used by the router to forward the packet that receives fordestination IP 172.16.32.1?A.metricB.longest prefixC.costD.administrative distanceCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 30Which configuration is needed to generate an RSA key for SSH on a router?A.Configure the version of SSHB.Configure VTY access.C.Create a user with a passwordD.Assign a DNS domain nameCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 31Which API is used in controller-based architectures to interact with edge devices?A.overlayB.northboundC.underlayD.southboundCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 32Router R1 must send all traffic without a matching routing-table entry to 192.168.1.1.which configuration accomplishes this task?A.R1# config tR1(config)# ip routingR1(config)# ip route default-route 192.168.1.1B.R1# config tR1(config)# ip routingR1(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.1C.R1# config tR1(config)# ip routingR1(config)# ip route 192.168.1.1 0.0.0.0 0.0.0.0D.R1# config tR1(config)# ip routingR1(config)# ip default-gateway 192.168.1.1Correct Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 33What is a benefit of using a Cisco Wireless LAN Controller?A.Central AP management requires more complex configurationsB.Unique SSIDs cannot use the same authentication methodC.It supports autonomous and lightweight APsD.It eliminates the need to configure each access point individuallyCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 34An engineer must configure a /30 subnet between two routers.which usable IP address and subnet mask combination meets this criteria?A.interface e0/0description to HQ-A370:98968ip address 10.2.1.3 255.255.255.252B.interface e0/0description to HQ-A370:98968ip address 192.168.1.1 255.255.255.248C.interface e0/0description to HQ-A370:98968ip address 172.16.1.4 255.255.255.248D.interface e0/0description to HQ-A370:98968ip address 209.165.201.2 255.255.255.252Correct Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 35Which unified access point mode continues to serve wireless clients after losing connectivity to the Cisco Wireless LAN Controller?A.snifferB.meshC.flexconnectD.localCorrect Answer: CSection: (none)ExplanationExplanation/Reference:https:///c/en/us/td/docs/wireless/controller/8-5/configguide/b_cg85/flexconnect.htmlQUESTION 36Refer to the exhibit. Based on the LACP neighbor status, in which mode is the SW1 port channel configured?A.passiveB.mode onC.autoD.activeCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 37which WPA3 enhancement protects against hackers viewing traffic on the Wi-Fi network?IP encryptionB.SAE encryptionC.AES encryptionD.scrambled encryption keyCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 38Refer to the exhibit. An engineer is bringing up a new circuit to the MPLS provider on the Gi0/1 interface of Router1.The new circuit uses eBGP and teams the route to VLAN25 from the BGP path. What is the expected behavior for the traffic flow for route10.10.13.0/25?A.Traffic to 10.10.13.0.25 is load balanced out of multiple interfacesB.Route 10.10.13.0/25 is updated in the routing table as being learned from interface Gi0/1.C.Traffic to 10.10.13.0/25 is a symmetricalD.Route 10.10.13.0/25 learned via the Gi0/0 interface remains in the routing tableCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 39Refer to the exhibit.How does router R1 handle traffic to 192.168.10.16?A.It selects the EIGRP route because it has the lowest administrative distanceB.It selects the RIP route because it has the longest prefix inclusive of the destination addressC.It selects the OSFP route because it has the lowest costD.It selects the IS-IS route because it has the shortest prefix inclusive of the destination addressCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 40Which two actions influence the EIGRP route selection process? (Choose two)A.The router calculates the reported distance by multiplying the delay on the exiting Interface by 256.B.The router calculates the best backup path to the destination route and assigns it as the feasible successor.C.The router calculates the feasible distance of all paths to the destination routeD.The advertised distance is calculated by a downstream neighbor to inform the local router of the bandwidth on the linkE.The router must use the advertised distance as the metric for any given routeCorrect Answer: BCSection: (none)ExplanationExplanation/Reference:QUESTION 41Refer to the exhibit.which two commands were used to create port channel 10?(choose two)A.int range g0/0-1Channel-group 10 mode activeB.Bint range g0/0-1Channel-group 10 mode desirableC.int range g0/0-1Channel-group 10 mode passiveD.int range g0/0-1Channel-group 10 mode autoE.int range g0/0-1Channel-group 10 mode onCorrect Answer: ACSection: (none)ExplanationExplanation/Reference:QUESTION 42What is a difference between RADIUS and TACACS+?A.TACACS+ encrypts only password information and RADIUS encrypts the entire payloadB.RADIUS logs all commands that are entered by the administrator, but TACACS+ logs only start, stop, and interim commandsC.RADIUS is most appropriate for dial authentication, but TACACS+ can be used for multiple types of authenticationD.TACACS+ separates authentication and authorization, and RADIUS merges themCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 43Refer to the exhibit. A network engineer must block access for all computers on VLAN 20 to the web server via HTTP. All other computers must be able to access the web server.Which configuration when applied to switch A accomplishes this task?A.B.C.D.Correct Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 44Refer to the exhibit. How does the router manage traffic to 192.168.12.16?A.It selects RIP route because it has the longest prefix inclusive of the destination addressB.It chooses the EIGRP route because it has the lowest administrative distanceC.It load-balances traffic between all three routesD.It chooses the OSPF route because it has the longest prefix inclusive of the destination address Correct Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 45What is an advantage of Cisco DNA Center versus traditional campus device management?A.It supports numerous extensibility options including cross-domain adapters and third-party SDKs.B.It supports high availability for management functions when operating in cluster mode.C.It enables easy autodiscovery of network elements m a brownfield deployment.D.It is designed primarily to provide network assuranceCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 46While examining excessive traffic on the network,it is noted that all incoming packets on an interface appear to be allowed even though an IPv4 ACL is applied to the interface. Which two misconfigurations cause this behavior? (Choose two)A.The packets fail to match any permit statementB.A matching permit statement is too high in the access testC.A matching deny statement is too high in the access listD.A matching permit statement is too broadly definedE.The ACL is emptyCorrect Answer: BDSection: (none)ExplanationExplanation/Reference:QUESTION 47Which design element is a best practice when deploying an 802.11b wireless infrastructure?A.disabling TPC so that access points can negotiate signal levels with their attached wireless devices.B.setting the maximum data rate to 54 Mbps on the Cisco Wireless LAN ControllerC.allocating non overlapping channels to access points that are in close physical proximity to one anotherD.configuring access points to provide clients with a maximum of 5 MbpsCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 48How do traditional campus device management and Cisco DNA Center device management differ in regards to deployment?A.Cisco DNA Center device management can be implemented at a lower cost than most traditional campus device management optionsB.Traditional campus device management schemes can typically deploy patches and updates more quickly than Cisco DNA Center device management.C.Cisco DNA Center device management can deploy a network more quickly than traditional campus device managementD.Traditional campus device management allows a network to scale more quickly than with Cisco DNA Center device management.Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 49Which two actions are performed by the Weighted Random Early Detection mechanism?(Choose two)A.It drops lower-priority packets before it drops higher-priority packetsB.It can identify different flows with a high level of granularityC.It guarantees the delivery of high-priority packetsD.It can mitigate congestion by preventing the queue from filling upE.IT supports protocol discoveryCorrect Answer: ADSection: (none)ExplanationExplanation/Reference:加权随机先期检测（WRED：Weighted Random Early Detection）是将随机先期检测与优先级排队结合起来，这种结合为高优先级分组提供了优先通信处理能力。

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CCNA(200-301)题库及答案

CCNA(200-301)题库及答案

Exam AQUESTION 1A network engineer must create a diagram of a multivendor network.which command must be configured on the Cisco devices so that the topology of the network can be mapped?A.Device(config)#lldp runB.Device(config)#cdp runC.Device(config)# cdp enableD.Device(config)# flow-sampler-map topologyCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 2Which feature on the Cisco Wireless LAN Controller when enabled restricts management access from specific networks?A.CPU ACLB.TACACSC.Flex ACLD.RADIUSCorrect Answer: ASection: (none)ExplanationExplanation/Reference:Reference:https:///c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.htmlQUESTION 3When a site-to-site VPN is used, which protocol is responsible for the transport of user data?A.IKEv2B.IKEv1C.IPsecD.MD5Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 4How do TCP and UDP differ in the way that they establish a connection between two endpoints？A.TCP use the three-way handshake,and UDP dose no guarantee message deliveryB.TCP use synchronization packets,and UDP uses acknowledgement packetsC.UDP provides reliable message transfer,and TCP is a connectionless protocol.D.UDP use SYN,SYN ACK,and FIN bits in the frame header while TCP uses SYN,SYN ACK,and ACK bis.Correct Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 5What are two reasons that cause late collisions to increment on an Ethernet interface?(choose two)A.when the sending device waits 15 seconds before sending the frame againB.when the cable length limits are exceededC.when one side of the connection is configured for half-duplexD.when Carner Sense Multiple Access/Collision Detection is usedE.when a collision occurs after the 32nd byte of a frame has been transmittedCorrect Answer: BDSection: (none)ExplanationExplanation/Reference:QUESTION 6A Cisco IP phone receive untagged data traffic from an attached PC. Which action is taken by the phone?A.It allows the traffic to pass through unchangedB.It drops the trafficC.It tags the traffic with the default VLAND.It tags the traffic with the native VLANCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 7Refer to the exhibit. The show ip ospf interface command has been executed on R1 How is OSPF configured?A.The interface is not participating in OSPFB.A point-to-point network type is configuredC.The default Hello and Dead timers are in useD.There are six OSPF neighbors on this interfaceCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 8What benefit does controller-based networking provide versus traditional networking?A.provides an added layer of security to protect from DDoS attacksbines control and data plane functionality on a single device to minimize latencyC.moves from a two-tier to a three-tier network architecture to provide maximum redundancyD.allows configuration and monitoring of the network from one centralized pointCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 9When a floating static route is configured, which action ensures that the backup route is used when the primary route fails?A.The floating static route must have a higher administrative distance than the primary route so it is used as a backupB.The administrative distance must be higher on the primary route so that the backup route becomes secondary.C.The floating static route must have a lower administrative distance than the primary route so it is used as a backupD.The default-information originate command must be configured for the route to be installed into the routing tableCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 10Which mode must be used to configure EtherChannel between two switches without using a negotiation protocol?A.onB.autoC.activeD.desirableCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 11What are two descriptions of three-tier network topologies? (Choose two.)A.The distribution layer runs Layer 2 and Layer 3 technologies.B.The network core is designed to maintain continuous connectivity when devices fail.C.The core layer maintains wired connections for each host.D.The core and distribution layers perform the same functionsE.The access layer manages routing between devices in different domains.Correct Answer: ABSection: (none)ExplanationExplanation/Reference:QUESTION 12Refer to the exhibit.which statement explains the configuration error message that is received?A.it belongs to a private IP address rangeB.the router dose not support /28 maskC.it is a network IP addressD.it is a broadcast IP addressCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 13what is the expected outcome when an EUI-64 address is generated?A.The seventh bit of original MAC address of the interface is invertedB.The interface ID is configured as a random 64-bit valueC.The characters FE80 are inserted at the beginning of the MAC address of the interfaceD.The MAC address of the interface is used as the interface ID without modificationCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 14Which function does an SNMP agent perform?A.It manages routing between Layer 3 devices in a network,B.It coordinates user authentication between a network device and a TACACS+ or RADIUS server.C.It sends information about MIB variables in response to requests from the NMS.D.It requests information from remote network nodes about catastrophic system events.Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 15Refer to the exhibit.The default-information originate command is configured under the R1 OSPF configuration.After testing,workstation on VLAN 20 at Site B cannot reach a DNS server on the Internet.wihch action corrects the configuration issue?A.Add the default-information originate command on R2B.Add the always keyword to the default-information originate command on R1C.Configure the ip route 0.0.0.0 0.0.0.0 10.10.10.18 command on R1D.Configure the ip route 0.0.0.0 0.0.0.0 10.10.10.2 command on R2Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 16What are two benefits of network automation? (Choose two)A.reduced operational costsB.reduced hardware footprintC.faster changes with more reliable resultsD.fewer network failuresE.increased network securityCorrect Answer: ACSection: (none)ExplanationExplanation/Reference:QUESTION 17Which two command sequences must you configure on a switch to establish a Layer 3 EtherChannel with an open-standard protocol?(choose two) A.interface GigabitEthernet0/0/1Channel-group 10 mode activeB.interface GigabitEthernet0/0/1Channel-group 10 mode autoC.interface GigabitEthernet0/0/1Channel-group 10 mode onD.interface port-channel 10no switchportip address 172.16.0.1 255.255.255.0E.interface port-channel 10switchportSwitchport mode trunkCorrect Answer: ADSection: (none)ExplanationExplanation/Reference:QUESTION 18Which command prevents passwords from being stored in the configuration as plaintext on a router or switch?A.enable secretB.service password-encryptionername Cisco password encryptD.enable passwordCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 19R1 has learned route 10.10.10.0/24 via numerous routing protocols,which route is installed?A.route with the lowest costB.route with the shortest prefix lengthC.route with the next hop that has the highest IPD.route with the lowest administrative distanceCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 20which network allows devices to communicate without the need to access the internet?A.172.9.0.0/16B.172.28.0.0/16C.192.0.0.0/18D.209.165.201.0/24Correct Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 21Which attribute does a router use to select the best path when two or more different routes to the same destination exist from two different routing protocols?A.dual algorithmB.metricC.administrative distanceD.hop countCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 22which command must be entered when a device is configured as an NTP server?A.ntp masterB.ntp severC.ntp authenticateD.ntp peerCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 23When OSPF learns multiple paths to a network, how does it select a route?A.It multiple the active K value by 256 to calculate the route with the lowest metric.B.For each existing interface, it adds the metric from the source router to the destination to calculate the route with the lowestbandwidth.C.It divides a reference bandwidth of 100 Mbps by the actual bandwidth of the existing interface to calculate the router with the lowestcost.D.It count the umber of hops between the source router and the destination to determine the router with the lowest metricCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 24What is a characteristic of spine-and-leaf architecture?A.It provides variable latency.B.Each link between leaf switches allows for higher bandwidth.C.Each device is separated by the same number of hops.D.It provides greater predictability on STP blocked ports.Correct Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 25Which two outcomes are predictable behaviors for HSRP? (Choose two)A.The two routers share a virtual IP address that is used as the default gateway for devices on the LAN.B.The two routers negotiate one router as the active router and the other as the standby routerC.Each router has a different IP address both routers act as the default gateway on the LAN, and traffic is load balanced betweenthem.D.The two routers synchronize configurations to provide consistent packet forwardingE.The two routed share the same IP address, and default gateway traffic is load-balanced between themCorrect Answer: ABSection: (none)ExplanationExplanation/Reference:QUESTION 26Which action must be taken to assign a global unicast IPv6 address on an interface that is derived from the MAC address of that interface?A.explicitly assign a link-local addressB.disable the EUI-64 bit processC.enable SLAAC on an interfaceD.configure a stateful DHCPv6 server on the networkCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 27Refer to the exhibit. What is the effect of this configuration?A.The switch port interface trust state becomes untrustedB.The switch port remains administratively down until the interface is connected to another switchC.Dynamic ARP inspection is disabled because the ARP ACL is missingD.The switch port remains down until it is configured to trust or untrust incoming packetsCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 28In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?A. A spine switch and a leaf switch can be added with redundant connections between themB. A spine switch can be added with at least 40 GB uplinksC. A leaf switch can be added with connections to every spine switchD. A leaf switch can be added with a single connection to a core spine switchCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 29Refer to the exhibit.Router R1 is running three different routing protocols.Which route characteristic is used by the router to forward the packet that receives fordestination IP 172.16.32.1?A.metricB.longest prefixC.costD.administrative distanceCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 30Which configuration is needed to generate an RSA key for SSH on a router?A.Configure the version of SSHB.Configure VTY access.C.Create a user with a passwordD.Assign a DNS domain nameCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 31Which API is used in controller-based architectures to interact with edge devices?A.overlayB.northboundC.underlayD.southboundCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 32Router R1 must send all traffic without a matching routing-table entry to 192.168.1.1.which configuration accomplishes this task?A.R1# config tR1(config)# ip routingR1(config)# ip route default-route 192.168.1.1B.R1# config tR1(config)# ip routingR1(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.1C.R1# config tR1(config)# ip routingR1(config)# ip route 192.168.1.1 0.0.0.0 0.0.0.0D.R1# config tR1(config)# ip routingR1(config)# ip default-gateway 192.168.1.1Correct Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 33What is a benefit of using a Cisco Wireless LAN Controller?A.Central AP management requires more complex configurationsB.Unique SSIDs cannot use the same authentication methodC.It supports autonomous and lightweight APsD.It eliminates the need to configure each access point individuallyCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 34An engineer must configure a /30 subnet between two routers.which usable IP address and subnet mask combination meets this criteria?A.interface e0/0description to HQ-A370:98968ip address 10.2.1.3 255.255.255.252B.interface e0/0description to HQ-A370:98968ip address 192.168.1.1 255.255.255.248C.interface e0/0description to HQ-A370:98968ip address 172.16.1.4 255.255.255.248D.interface e0/0description to HQ-A370:98968ip address 209.165.201.2 255.255.255.252Correct Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 35Which unified access point mode continues to serve wireless clients after losing connectivity to the Cisco Wireless LAN Controller?A.snifferB.meshC.flexconnectD.localCorrect Answer: CSection: (none)ExplanationExplanation/Reference:https:///c/en/us/td/docs/wireless/controller/8-5/configguide/b_cg85/flexconnect.htmlQUESTION 36Refer to the exhibit. Based on the LACP neighbor status, in which mode is the SW1 port channel configured?A.passiveB.mode onC.autoD.activeCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 37which WPA3 enhancement protects against hackers viewing traffic on the Wi-Fi network?IP encryptionB.SAE encryptionC.AES encryptionD.scrambled encryption keyCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 38Refer to the exhibit. An engineer is bringing up a new circuit to the MPLS provider on the Gi0/1 interface of Router1.The new circuit uses eBGP and teams the route to VLAN25 from the BGP path. What is the expected behavior for the traffic flow for route10.10.13.0/25?A.Traffic to 10.10.13.0.25 is load balanced out of multiple interfacesB.Route 10.10.13.0/25 is updated in the routing table as being learned from interface Gi0/1.C.Traffic to 10.10.13.0/25 is a symmetricalD.Route 10.10.13.0/25 learned via the Gi0/0 interface remains in the routing tableCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 39Refer to the exhibit.How does router R1 handle traffic to 192.168.10.16?A.It selects the EIGRP route because it has the lowest administrative distanceB.It selects the RIP route because it has the longest prefix inclusive of the destination addressC.It selects the OSFP route because it has the lowest costD.It selects the IS-IS route because it has the shortest prefix inclusive of the destination addressCorrect Answer: BSection: (none)ExplanationExplanation/Reference:QUESTION 40Which two actions influence the EIGRP route selection process? (Choose two)A.The router calculates the reported distance by multiplying the delay on the exiting Interface by 256.B.The router calculates the best backup path to the destination route and assigns it as the feasible successor.C.The router calculates the feasible distance of all paths to the destination routeD.The advertised distance is calculated by a downstream neighbor to inform the local router of the bandwidth on the linkE.The router must use the advertised distance as the metric for any given routeCorrect Answer: BCSection: (none)ExplanationExplanation/Reference:QUESTION 41Refer to the exhibit.which two commands were used to create port channel 10?(choose two)A.int range g0/0-1Channel-group 10 mode activeB.Bint range g0/0-1Channel-group 10 mode desirableC.int range g0/0-1Channel-group 10 mode passiveD.int range g0/0-1Channel-group 10 mode autoE.int range g0/0-1Channel-group 10 mode onCorrect Answer: ACSection: (none)ExplanationExplanation/Reference:QUESTION 42What is a difference between RADIUS and TACACS+?A.TACACS+ encrypts only password information and RADIUS encrypts the entire payloadB.RADIUS logs all commands that are entered by the administrator, but TACACS+ logs only start, stop, and interim commandsC.RADIUS is most appropriate for dial authentication, but TACACS+ can be used for multiple types of authenticationD.TACACS+ separates authentication and authorization, and RADIUS merges themCorrect Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 43Refer to the exhibit. A network engineer must block access for all computers on VLAN 20 to the web server via HTTP. All other computers must be able to access the web server.Which configuration when applied to switch A accomplishes this task?A.B.C.D.Correct Answer: DSection: (none)ExplanationExplanation/Reference:QUESTION 44Refer to the exhibit. How does the router manage traffic to 192.168.12.16?A.It selects RIP route because it has the longest prefix inclusive of the destination addressB.It chooses the EIGRP route because it has the lowest administrative distanceC.It load-balances traffic between all three routesD.It chooses the OSPF route because it has the longest prefix inclusive of the destination address Correct Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 45What is an advantage of Cisco DNA Center versus traditional campus device management?A.It supports numerous extensibility options including cross-domain adapters and third-party SDKs.B.It supports high availability for management functions when operating in cluster mode.C.It enables easy autodiscovery of network elements m a brownfield deployment.D.It is designed primarily to provide network assuranceCorrect Answer: ASection: (none)ExplanationExplanation/Reference:QUESTION 46While examining excessive traffic on the network,it is noted that all incoming packets on an interface appear to be allowed even though an IPv4 ACL is applied to the interface. Which two misconfigurations cause this behavior? (Choose two)A.The packets fail to match any permit statementB.A matching permit statement is too high in the access testC.A matching deny statement is too high in the access listD.A matching permit statement is too broadly definedE.The ACL is emptyCorrect Answer: BDSection: (none)ExplanationExplanation/Reference:QUESTION 47Which design element is a best practice when deploying an 802.11b wireless infrastructure?A.disabling TPC so that access points can negotiate signal levels with their attached wireless devices.B.setting the maximum data rate to 54 Mbps on the Cisco Wireless LAN ControllerC.allocating non overlapping channels to access points that are in close physical proximity to one anotherD.configuring access points to provide clients with a maximum of 5 MbpsCorrect Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 48How do traditional campus device management and Cisco DNA Center device management differ in regards to deployment?A.Cisco DNA Center device management can be implemented at a lower cost than most traditional campus device management optionsB.Traditional campus device management schemes can typically deploy patches and updates more quickly than Cisco DNA Center device management.C.Cisco DNA Center device management can deploy a network more quickly than traditional campus device managementD.Traditional campus device management allows a network to scale more quickly than with Cisco DNA Center device management.Correct Answer: CSection: (none)ExplanationExplanation/Reference:QUESTION 49Which two actions are performed by the Weighted Random Early Detection mechanism?(Choose two)A.It drops lower-priority packets before it drops higher-priority packetsB.It can identify different flows with a high level of granularityC.It guarantees the delivery of high-priority packetsD.It can mitigate congestion by preventing the queue from filling upE.IT supports protocol discoveryCorrect Answer: ADSection: (none)ExplanationExplanation/Reference:加权随机先期检测（WRED：Weighted Random Early Detection）是将随机先期检测与优先级排队结合起来，这种结合为高优先级分组提供了优先通信处理能力。

CCNA中英对照题库(选择题)

CCNA中英对照题库(选择题)

CCNA（200-120）题库中英对照整理于：2015年3月31日版本：1.2声明：本题库来源互联网（鸿鹄论坛）本题库为英文考试原版左右选择题中文考试为随机抽取英文题的中译版此题库非中文考试题库，而是英文题库手动翻译此题库为手工个人翻译，存在错误和不妥难免，不代表任何官方机构和组织本题库旨在更好的理解英文原本题库，也可以用于中文考试参考用。

如发现任何错误或不当之处，可以自行修改，但请更新版本以免混乱，也可致上传者。

QUESTION001Refer to the exhibit. What will Router1 do when it receives the data frame shown? (Choose three.) 参照下图，这个图示显示了Ｒ１接受到如图所示数据帧的时候会怎么做？Router1 will strip off the source MAC address and replace it with the MACaddress 0000.0c36.6965.Ｒ１会剥离源ＭＡＣ地址，以0000：0C36.6965代替。

Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1. Ｒ１会剥离源IP地址，以192.168.40.1代替。

Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.Ｒ１会剥离源ＭＡＣ地址，以0000：0C36.6965代替。

Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1.Ｒ１会剥离目的IP地址，以192.168.40.1代替。

CCNA第二 部分考试题

CCNA第二 部分考试题

1、解决路由环问题的方法有____ABD_____A. 水平分割B. 路由保持法C. 路由器重启D. 定义路由权的最大值2、下面哪一项正确描述了路由协议_______C__A. 允许数据包在主机间传送的一种协议B. 定义数据包中域的格式和用法的一种方式C. 通过执行一个算法来完成路由选择的一种协议D. 指定MAC地址和IP地址捆绑的方式和时间的一种协议3、以下哪些内容是路由信息中所不包含的_____A____A. 源地址B. 下一跳C. 目标网络D. 路由权值4、以下说法那些是正确的_____BD____A. 路由优先级与路由权值的计算是一致的B. 路由权的计算可能基于路径某单一特性计算，也可能基于路径多种属性C. 如果几个动态路由协议都找到了到达同一目标网络的最佳路由，这几条路由都会被加入路由表中D. 动态路由协议是按照路由的路由权值来判断路由的好坏，并且每一种路由协议的判断方法都是不一样的5、IGP的作用范围是________C_A. 区域内B. 局域网内C. 自治系统内D. 自然子网范围内6、距离矢量协议包括____AB___A. RIPB. IGRPC. IS-ISD. OSPF7、关于矢量距离算法以下那些说法是错误的___A____A. 矢量距离算法不会产生路由环路问题B. 矢量距离算法是靠传递路由信息来实现的C. 路由信息的矢量表示法是(目标网络，metric)D. 使用矢量距离算法的协议只从自己的邻居获得信息8、如果一个内部网络对外的出口只有一个，那么最好配置_____A____A. 缺省路由B. 主机路由C. 动态路由10、在路由器中，如果去往同一目的地有多条路由，则决定最佳路由的因素有_____A_C_A. 路由的优先级B. 路由的发布者C. 路由的metirc值D. 路由的生存时间9、在RIP协议中，计算metric值的参数是_D________A. MTUB. 时延C. 带宽D. 路由跳数10、路由协议存在路由自环问题______A___A. RIPB. BGPC. OSPFD. IS-IS11、下列关于链路状态算法的说法正确的是: ___D______A. 链路状态是对路由的描述B. 链路状态是对网络拓扑结构的描述C. 链路状态算法本身不会产生自环路由D. OSPF和RIP都使用链路状态算法12、在OSPF同一区域(区域A)内，下列说法正确的是____D_____A. 每台路由器生成的LSA都是相同的B. 每台路由器根据该最短路径树计算出的路由都是相同的C. 每台路由器根据该LSDB计算出的最短路径树都是相同的D. 每台路由器的区域A的LSDB(链路状态数据库)都是相同的13、在一个运行OSPF的自治系统之内: _AD________A. 骨干区域自身也必须是连通的B. 非骨干区域自身也必须是连通的C. 必须存在一个骨干区域 ( 区域号为0 )D. 非骨干区域与骨干区域必须直接相连或逻辑上相连14、下列静态路由配置正确的是__D_______A. ip route 129.1.0.0 16 serial 0B. ip route 10.0.0.2 16 129.1.0.0C. ip route 129.1.0.0 16 10.0.0.2D. ip route 129.1.0.0 255.255.0.0 10.0.0.215、以下不属于动态路由协议的是______B___A. RIPB. ICMPC. IS-ISD. OSPf16、三种路由协议RIP 、OSPF 、BGP和静态路由各自得到了一条到达目标网络，路由器默认情况下，最终选选定____D____作为最优路由A. RIPB. OSPFC. BGPD.静态路由17、IGP 包括如下哪些协议_ABD________A. RIPB. BGPC. IS-ISD. OSPF18、路由环问题会引起_______A_A. 慢收敛B. 广播风暴C. 路由器重起D. 路由不一致19、以下哪些路由表项要由网络管理员手动配置_A_______A. 静态路由B. 直接路由C. 动态路由D. 以上说法都不正确20、关于RIP协议，下列说法正确的有: ________AC_A. RIP协议是一种IGPB. RIP协议是一种EGPC. RIP协议是一种距离矢量路由协议D. RIP协议是一种链路状态路由协议21、RIP协议是基于_____A____A. UDPB. TCPC. ICMPD. Raw IP22、RIP协议的路由项在多少时间内没有更新会变为不可达? __C_______A. 90sB. 120sC. 180sD. 240s23、解决路由环路的方法有______ABCDA. 水平分割B. 抑制时间C. 毒性逆转D. 触发更新24、RIP协议在收到某一邻居网关发布而来的路由信息后，下述对度量值的正确处理有哪些?_AD________A. 对本路由表中没有的路由项，只在度量值少于不可达时增加该路由项B. 对本路由表中已有的路由项，当发送报文的网关相同时，只在度量值减少时更新该路由项的度量值C. 对本路由表中已有的路由项，当发送报文的网关不同时，只在度量值减少时更新该路由项的度量值D. 对本路由表中已有的路由项，当发送报文的网关相同时，只要度量值有改变，一定会更新该路由项的度量值25、关于RIP V1和RIP V2，下列说法哪些正确? _BC_______A. RIP V1报文支持子网掩码B. RIP V2报文支持子网掩码C. RIP V2缺省使用路由聚合功能D. RIP V1只支持报文的简单口令认证，而RIP V2支持MD5认证26、在rip中metric等于_____D____为不可达A. 8B. 10C. 15D. 1627、RIP协议引入路由保持机制的作用是____B_____A. 节省网络带宽B. 防止网络中形成路由环路C. 将路由不可达信息在全网扩散D. 通知邻居路由器哪些路由是从其处得到28、与动态路由协议相比，静态路由有哪些优点? AB_______A. 带宽占用少B. 简单C. 路由器能自动发现网络拓扑变化D. 路由器能自动计算新的路由29、在RIP路由协议中，以下有关减少路由自环的方法正确的是__ABC__D_____A. 触发更新是从减少路由自环发生的概率方面来考虑问题的B. 水平分割的方法只对消除两台路由器之间的自环有作用C. 设置抑制时间的方法可能导致路由的慢收敛D. 为了减轻路由自环产生的后果，RIP协议规定了最大跳数30、路由协议在收到某一邻居发布而来的路由信息后，下述对度量值的正确处理有哪些? __BD_______A. 对本路由表中已有的路由项，当发送该路由信息的邻居相同时，只在度量值减少时更新该路由项的度量值B. 对本路由表中已有的路由项，当发送该路由信息的邻居相同时，只要度量值有改变，一定会更新该路由项的度量值C. 对本路由表中已有的路由项，当发送该路由信息的邻居不同时，只要度量值有改变，一定会更新该路由项的度量值D. 对本路由表中没有的路由项，只在度量值少于不可达时增加该路由项31、下面哪些协议是可路由协议(routed protocol)? ____AB_____A. IPB. IPXC. RIPD. NETBEUI32、以下协议属于路由协议的是_____ABCG____A. RIPB. IS-ISC. OSPFD. PPPE. IPF. IPXG. BGP33、下列哪些技术有助于避免路由环路? ___BCDEF______A. 直通交换B. 采用链路状态路由协议C. 水平分割D. 路由保持(holddown)E. 定义最大跳计数F. 路由中毒(poison reverse)34、静态路由的优点包括: ___AD______A. 管理简单B. 自动更新路由C. 提高网络安全性D. 节省带宽E. 收敛速度快35、以下对于缺省路由描述正确的是: ___BC______A. 缺省路由是优先被使用的路由B. 缺省路由是最后一条被使用的路由C. 缺省路由是一种特殊的静态路由D. 缺省路由是一种特殊的动态路由36、对路由器A配置RIP协议，并在接口S0(IP地址为10.0.0.1/24)所在网段使能RIP路由协议，在全局配置模式下使用的第一条命令是: ______A___A. Router ripB. rip 10.0.0.0C. network 10.0.0.1D. network 10.0.0.037、支持可变长子网掩码的路由协议有: __BCD_______A. RIP v1B. RIP v2C. OSPFD. IS-IS38、以下对路由优先级的说法，正确的是____BC_____A. 仅用于RIP和OSPF之间B. 用于不同路由协议之间C. 是路由选择的重要依据D. 直接路由的优先级缺省为039、您认为下列说法哪些是不正确的? ____CD__A. 每条静态路由的优先级也可以不相同B. 缺省情况下路由优先级的次序是 OSPF > RIPC. 路由算法产生一种权值来表示路由的好坏。

CCNA路由部分测试题(含答案)

CCNA路由部分测试题(含答案)

CCNA路由部分测试题（共50题）1.当路由器接收的IP报文的目的地址不是本路由器的接口IP地址，并且在路由表中未找到匹配的路由项，采取的策略是什么？A.丢掉该分组B.将该分组分片C.转发该分组D.以上答案均不对ANSWER:A2.IGP 的作用范围是？A.区域内B.自然子网范围内C.局域网内D.自治系统内ANSWER:Dㄨ3.距离矢量协议包括？(多选)A.RIPB.IS-ISC.OSPFD.EIGRPANSWER:A Dㄨ4.解决路由环问题的办法是？(多选)A.定义路由权的最大值B.路由保持法C.水平分割D.路由器重启ANSWER:A B C5.在rip 中metric 等于什么值为不可达？A.8B.10C.15D.16ANSWER:Dㄨ6.下列关于OSPF 协议的说法正确的是？(多选)A.OSPF 支持基于接口的报文验证B.OSPF 支持到同一目的地址的多条等值路由C.OSPF 是一个基于链路状态算法的边界网关路由协议D.OSPF 发现的路由可以根据不同的类型而有不同的优先级ANSWER:A B Dㄨ7.如果一个内部网络对外的出口只有一个，那么最好配置？A.缺省路由B.主机路由C.动态路由ANSWER:A8.以下不属于动态路由协议的是？A.RIPB.ICMPC.EIGRPD.OSPFANSWER:B9.关于矢量距离算法以下哪些说法是错误的？A.矢量距离算法不会产生路由环路问题B.矢量距离算法是靠传递路由信息来实现的C.路由信息的矢量表示法是（目标网络，metric）D.使用矢量距离算法的协议只从自己的邻居获得信息ANSWER:A10.以下哪些路由表项要由网络管理员手动配置？(多选)A.静态路由B.直接路由C.缺省路由D.动态路由ANSWER:A C11.关于RIP 协议，下列说法正确的有？(多选)A.RIP 协议是一种IGPB.RIP 协议是一种EGPC.RIP 协议是一种距离矢量路由协议D.RIP 协议是一种链路状态路由协议ANSWER:A Cㄨ12.下列关于链路状态算法的说法正确的是？(多选)A.链路状态是对路由的描述B.链路状态是对网络拓扑结构的描述C.链路状态算法本身不会产生自环路由D.OSPF 和RIP 都使用链路状态算法ANSWER:B C13.路由器中时刻维持着一张路由表，这张路由表可以是静态配置的，也可以是什么协议产生的？A.生成树协议B.链路控制协议C.动态路由协议D.被承载网络层协议ANSWER:Cㄨ14.在路由器中，如果去往同一目的地有多条路由，则决定最佳路由的因素有？(多选)A.路由的优先级B.路由的发布者C.路由的metric 值D.路由的生存时间ANSWER:A C15.下面哪一项正确描述了路由协议？A.允许数据包在主机间转送的一种协议B.定义数据包中域的格式和用法的一种方式C.通过执行一个算法来完成路由选择的一个协议D.指定MAC 地址和IP 地址捆绑的方式和时间的一种协议ANSWER:Cㄨ16.IGP 包括如下哪些协议？(多选)A.RIPB.BGPC.IS-ISD.EIGRPE.OSPFANSWER:A C D Eㄨ17.RIP 协议引入路由保持机制的作用是？A.节省网络带宽B.防治网络中形成路由环路C.将路由不可达信息在全网扩散D.通知邻居路由器哪些路由是从其处得到ANSWER:B18.对路由理解正确的是？A.路由是路由器B.路由是信息在网络路径的交叉点C.路由是用以配置报文的目的地址D.路由就是指导报文发送的路径信息ANSWER:Dㄨ19.路由协议RIP，OSPF和静态路由各自得到了条到达目标网络，在CISCO路由器默认情况下，最终选选定哪种路由作为最优路由？A.RIPB.OSPFC.静态路由ANSWER:C20.在RIP 协议中，计算metric 值的参数是？A.MTUB.时延C.带宽D.路由跳数ANSWER:D21.衡量路由算法好坏的原则不包括？A.快速收敛性B.灵活性，弹性C.拓扑结构先进D.选径是否是最佳ANSWER:Cㄨ22.RIP 协议是基于？A.UDPB.TCPC.ICMPD.Raw IPANSWER:A23.禁止RIP 协议的路由聚合功能的命令是？A.no route ripB.summanyC.no auto summanyD.undo network 10.0.0.0ANSWER:Cㄨ24.解决路由环路的方法有？(多选)A.水平分割B.抑制时间C.毒性逆转D.触发更新ANSWER:A B C Dㄨ25.路由环问题会引起哪些问题？(多选)A.慢收敛B.广播风暴C.路由器重起D.路由不一致ANSWER:A D26.下列哪些路由协议存在路由自环问题？(多选)A.RIPB.IGRPC.OSPFD.IS-ISE.EIGRPANSWER:A B27.关于RIP V1 和RIP V2，下列说法哪些正确？(多选)A.RIP V1 报文支持子网掩码B.RIP V2 报文支持子网掩码C.RIP V2 缺省使用路由聚合功能D.RIP V1 只支持报文的简单口令认证，而RIP V2 支持MD5 认证ANSWER:B Cㄨ28.在一个运行OSPF 的自治系统之内？(多选)A.骨干区域自身也必须连通的B.非骨干区域自身也必须连通的C.必须存在一个骨干区域（区域号为0）D.非骨干区域与骨干区域必须直接相连或逻辑上相连ANSWER:A C Dㄨ29.以下关于Rip 路由聚合的说法正确的是？(多选)A.Rip V1 默认支持路由聚合，需要时可以关闭路由聚合功能B.华为Quidway 系列路由器Rip V2 的实现可以关闭路由聚合功能C.Rip V1 不支持子网路由聚合到一个非自然子网路由D.Rip V2 支持子网路由聚合到一个非自然子网路由ANSWER:B C D30.假设有这样的组网实例:两台路由器（假设为RTA 和RTB）通过串口相接，其中RTA 的串口IP 地址是10.110.0.1/30，RTB 的串口IP 地址是10.110.0.2/30，RTA 通过以太口连接的本地局域网的IP 地址是11.110.0.0/16，RTB 通过以太口连接的本地局域网IP 地址是11.111.0.0/16，在上面所有的接口上都启动RIP V1（仅仅RIP V1）协议，那么，下列说法正确的是？(多选)A.在RTA 的本地局域网上的计算机可以访问在RTB 本地局域网上的计算机B.在RTB 的本地局域网上的计算机可以访问在RTA 本地局域网上的计算机C.在RTA 的本地局域网上的计算机不能访问在RTB 本地局域网上的计算机D.在RTB 的本地局域网上的计算机不能访问在RTA 本地局域网上的计算机ANSWER:C Dㄨ31.根据路由的目的地不同，路由表可被划分为？(多选)A.子网路由B.直连路由C.缺省路由D.主机路由E.静态路由ANSWER:A D32.对路由器A 配置RIP 协议，并在接口S0（IP 地址为10.0.0.1/24）所在网段使能RIP 路由协议，在全局配置模式下使用的第一条命令是？A.router ripwork allwork 10.0.0.1work 10.0.0.0ANSWER:Aㄨ33.当接口运行在RIP-2 广播方式时，它可以接受的报文有？(多选)A.RIP-1 广播报文B.RIP-1 组播报文C.RIP-2 广播报文D.RIP-2 组播报文ANSWER:A Cㄨ34.RIP 协议的路由项在多少时间内没有更新会变为不可达？A.90sB.120sC.180sD.240sANSWER:Cㄨ35.VLSM 的含义是？A.Variable Length Subnet MaskingB.Variable Length Shortest MaskingC.Very Long/Shortest MaskingD.Variable Long Subnet MaskingE.Variable Length Short MeasurementANSWER:Aㄨ36.距离矢量路由协议使用水平分割（split horizon）技术的目的是什么？(多选)A.避免在毗邻路由器之间产生路由环路B.确保路由更新数据报文沿着接收路线方向发送C.与保持间隔（holddown）机制协同工作，为保持间隔的计算提供更多的可靠性D.代替路由中毒（poison reverse）算法ANSWER:A Cㄨ37.作为一个网络维护人员，对于OSPF 区域体系机构的原则必须有清楚地了解，下面的论述表达正确的是？(多选)A.所有的OSPF 区域必须通过边界路由器与区域0 相连，或采用OSPF 虚链路B.所有区域间通信必须通过骨干区域0，因此所有区域路由器必须包含到区域0 的路由C.单个区域不能包含没有物理链路的两个区域边界路由器D.虚链路可以穿越stub 区域ANSWER:A Bㄨ38.支持可变长子网掩码的路由协议有？(多选)A.RIP v1B.RIP v2C.OSPFD.EIGRPANSWER:B C Dㄨ39.因为在生成路由表的过程中，OSPF 协议需要进行复杂的SPF 算法来计算网络拓扑结构，所以相对距离矢量路由选择协议来说，它需要更大的开销，更多的延迟，更高的CPU 占用率。