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CCNA640-802 V13题库试题中文分析

1. What are two reasons that a network administrator would use access lists? (Choose two.)

A. to control vty access into a router

B. to control broadcast traffic through a router

C. to filter traffic as it passes through a router

D. to filter traffic that originates from the router

E. to replace passwords as a line of defense against security incursions

Answer: AC

解释一下：在VTY线路下应用ACL，可以控制从VTY线路进来的telnet的流量。

也可以过滤穿越一台路由器的流量。

2. A default Frame Relay WAN is classified as what type of physical network?

A. point-to-point

B. broadcast multi-access

C. nonbroadcast multi-access

D. nonbroadcast multipoint

E. broadcast point-to-multipoint

Answer: C

解释一下：在默认的情况下，帧中继为非广播多路访问链路。但是也可以通过子接口来修改他的网络的类型。

3．Refer to the exhibit. How many broadcast domains exist in the exhibited topology?

A. one

B. two

C. three

D. four

E. five

F. six

Answer: C

解释一下：广播域的问题，在默认的情况下，每个交换机是不能隔离广播域的，所以在同一个区域的所有交换机都在同一个广播域中，但是为了减少广播的危害，将广播限制在一个更小的范围，有了VLAN的概念，VLAN表示的是一个虚拟的局域网，而他的作用就是隔离广播。所以被VLAN隔离了的每个区域都表示一个单独的广播域，这样一个VLAN中的广播的流量是不能传到其他的区域的，所以在上题中就有3个广播域了。

4. A single 802.11g access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at peak

efficiency. What are three likely causes of this problem? (Choose three.)

A. mismatched TKIP encryption

B. null SSID

C. cordless phones

D. mismatched SSID

E. metal file cabinets

F. antenna type or direction

Answer: CEF