CCNA（200-301）题库V1.0(2020.11.23)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?网络工程师必须创建一个多供应商网络图。
必须在Cisco设备上配置哪个命令才能映射网络拓扑？A. Device(config)#lldp runB. Device(config)#cdp runC. Device(config)# cdp enableD. Device(config)# flow-sampler-map topologyCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 2Which feature on the Cisco Wireless LAN Controller when enabled restricts management access from specific networks?启用时，思科无线局域网控制器上的哪个功能会限制来自特定网络的管理访问？A. CPU ACLB. TACACSC. Flex ACLD. RADIUSCorrect Answer: A Section:choice E xplanationExplanation/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?使用站点到站点VPN时，哪个协议负责用户数据的传输？A. IKEv2B. IKEv1C. IPsecD. MD5Correct Answer: C Section:choice E xplanationExplanation/Reference:QUESTION 4How do TCP and UDP differ in the way that they establish a connection between two endpoints？TCP和UDP在两个端点之间建立连接的方式有何不同？A. TCP use the three-way handshake,and UDP dose no guarantee message deliveryA. TCP使用三向握手，而UDP不保证消息传递B. 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: A Section:choice E xplanationExplanation/Reference:QUESTION 5What are two reasons that cause late collisions to increment on an Ethernet interface?(choose two) 导致延迟冲突在以太网接口上增加的两个原因是什么？（选择两个）A. when the sending device waits 15 seconds before sending the frame againB. when the cable length limits are exceeded超出电缆长度限制时C. when one side of the connection is configured for half-duplexD. when Carner Sense Multiple Access/Collision Detection is used使用Carner Sense多路访问/冲突检测时E. when a collision occurs after the 32nd byte of a frame has been transmittedCorrect Answer: BDSection: choiceExplanationExplanation/Reference:QUESTION 6A Cisco IP phone receive untagged data traffic from an attached PC. Which action is taken by the phone? 思科IP电话从连接的PC接收未标记的数据流量。
电话采取什么行动？A. It allows the traffic to pass through unchanged它允许流量不变地通过B. It drops the trafficC. It tags the traffic with the default VLAND. It tags the traffic with the native VLANCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 7Refer to the exhibit. The show ip ospf interface command has been executed on R1 How is OSPF configured? 请参见图示。
在R1上已执行show ip ospf interface命令。
如何配置OSPF？A. The interface is not participating in OSPFB. A point-to-point network type is configuredC. The default Hello and Dead timers are in use使用默认的Hello和Dead计时器D. There are six OSPF neighbors on this interfaceCorrect Answer: C Section:choice E xplanationExplanation/Reference:QUESTION 8What benefit does controller-based networking provide versus traditional networking?与传统网络相比，基于控制器的网络有什么好处？A. provides an added layer of security to protect from DDoS attacksB. combines 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 point允许从一个集中点配置和监视网络Correct Answer: D Section:choice E xplanationExplanation/Reference:QUESTION 9When a floating static route is configured, which action ensures that the backup route is used when the primary route fails? 配置浮动静态路由后，当主路由发生故障时，可以采取哪些措施确保使用备用路由？A. The floating static route must have a higher administrative distance than the primary route so it is used as a backup浮动静态路由必须具有比主路由更高的管理距离，因此可以用作备用路由B. 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: A Section:choice E xplanationExplanation/Reference:QUESTION 10Which mode must be used to configure EtherChannel between two switches without using a negotiation protocol?在不使用协商协议的情况下，必须使用哪种模式在两个交换机之间配置EtherChannel？A. onB. autoC. activeD. desirablCorrect Answer: A Section:choice E xplanationExplanation/Reference:QUESTION 11What are two descriptions of three-tier network topologies? (Choose two.)三层网络拓扑的两个描述是什么？（选择两个。