2021年CCNA(200-301)带中文翻译考试题库

CCNA（200-301）题库V

1.0(2020.11.23)

Exam A

QUESTION 1

A 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 run

B. Device(config)#cdp run

C. Device(config)# cdp enable

D. Device(config)# flow-sampler-map topology

Correct Answer: A Section:

choice E xplanation

Explanation/Reference:

QUESTION 2

Which 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 ACL

B. TACACS

C. Flex ACL

D. RADIUS

Correct Answer: A Section:

choice E xplanation

Explanation/Reference:

Reference:

https:///c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.html

QUESTION 3

When 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. IKEv2

B. IKEv1

C. IPsec

D. MD5

Correct Answer: C Section:

choice E xplanation

Explanation/Reference:

QUESTION 4

How 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 delivery

A. 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 packets

C. 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 xplanation

Explanation/Reference:

QUESTION 5

What 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 again

B. 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-duplex

D. 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 transmitted

Correct Answer: BD

Section: choice

Explanation

Explanation/Reference:

QUESTION 6

A 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 traffic

C. It tags the traffic with the default VLAN

D. It tags the traffic with the native VLAN

Correct Answer: A Section:

choice E xplanation

Explanation/Reference:

QUESTION 7