Which two commands correctly verify wh...

多项选择题Which two commands correctly verify whether port security has been configured on port FastEthernet 0/12 on a switch?（）

A.SW1#show swithport port-security interface FastEthernet 0/12
B.SW1#show swithport port-secure interface FastEthernet 0/12
C.SW1#show port-secure interface FastEthernet 0/12
D.SW1#show running-config

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1.多项选择题下面接口为物理接口的有（）。

A.dialer
B.语音接口
C.serial口
D.子接口
E.CE1/PRI接口
F.虚拟接口模板
G.ISDNBRI接口
H.备份中心逻辑通道

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2.多项选择题Which of the following statements are true regarding bridges and switches?（）

A.Switches are primarily software based while bridges are hardware based.
B.Both bridges and switches forward Layer 2 broadcasts.
C.Bridges are frequently faster than switches.
D.Switches have a higher number of ports than most bridges.
E.Bridges define broadcast domains while switches define collision domains.
F.Both bridges and switches make forwarding decisions based on Layer 2 addresses.

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3.单项选择题In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links（）。

A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.255.255.255.254

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4.判断题OSI中，链路层和传输层都是面向连接的，但链路层建立的是点到点的连接，传输层建立的是端到端的连接。

参考答案：对

5.单项选择题IP地址与它的掩码取反相与，所得的非零点分十进制数是此IP地址的（）。

A.A类
B.主机地址
C.网络地址
D.解析地址

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6.单项选择题While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。

A.The port is experiencing errors
B.The port is administratively disabled
C.The port is blocked by spanning tree
D.The port has an active link with normal traffic activity

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7.多项选择题下列哪些接口可作逻辑通道？（）

A.X.25
B.帧中继
C.dialer
D.同/异步串口

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8.多项选择题What are some of the advantages of using a router to segment the network?（）

A.Filtering can occur based on Layer 3 information.
B.Broadcasts are eliminated.
C.Routers generally cost less than switches.
D.Broadcasts are not forwarded across the router.
E.Adding a router to the network decreases latency.

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9.单项选择题OSI中，哪些不是表示层功能？（）

A.数据加密
B.数据压缩
C.密码控制
D.数据格式转换

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10.判断题CSMA/CD网络中，所有主机都可独占网络带宽。

参考答案：错