[多选题]Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)

正确答案 ：BD

Half-duplex Ethernet uses a loopback circuit to detect collisions.

Full-duplex Ethernet makes use of two pairs of wires for data.

解析：解析：Explanation:

[单选题]The 201.145.32.0 network is subnetted using a /26 mask. How many networks and IP hosts per network exists using this subnet mask?

正确答案 ：C

4 networks and 62 hosts

解析：解析：Explanation:

[单选题]After working on a router, some problems arise and you wish to view the commands that you recently entered. Which IOS command opens the history buffer and displays the most recently entered commands?

正确答案 ：A

Show history

解析：A 解析：Explanation:

[单选题]OSPF的度量值是什么()

正确答案 ：D

链路状态

[单选题]在路由表中到达同一网络的路由有：静态路由、RIP路由、IGRP路由，OSPF路由，则路由器会选用哪条路由传输数据：()

正确答案 ：A

静态路由

[单选题]RIP路由协议认为“网络不可到达”的跳数是：()

正确答案 ：B

16

[单选题]The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device?

正确答案 ：A

To prevent unauthorized hosts from getting access to the LAN

解析：解析：Explanation:

[单选题]关于PPP和HDLC的说法中，错误的是（）

正确答案 ：D

在配置ISDN时，广域网协议不能封装成PPP，但可以封装成HDLC

[单选题]把指定端口添加到VLAN的命令是：()

正确答案 ：D

switch port

[单选题]介质工作在OSI的哪一层（）

正确答案 ：A

物理层

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