正确答案: A

Router(config)show run

题目：下列命令中，无法正确执行的是（）

解析：A

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学习资料的答案和解析：

[单选题]关于OSPF中DR的说法不正确的是（）

如果某路由器优先级比DR优先级高，但启动晚，它会抢占原来的DR自己成为DR

[单选题]在地址转换中，()用来规定哪些数据包需要进行地址转换

访问控制列表

[单选题]路由器下“特权用户模式”的标识符是：()

[单选题]在路由器上，命令show access-list的功能是（）

显示访问控制列表内容

[单选题]关于PPP和HDLC的说法中，错误的是（）

在配置ISDN时，广域网协议不能封装成PPP，但可以封装成HDLC

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

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]After working all night and successfully configuring a Cisco router for the Ezonexam network you save your changes on the startup config, reboot the router, and go out for a cigarette. When you return, none of your changes are active and the router boots to the initial configuration mode! Which of the choices below indicates the source of your problem?

Router configuration-register set to bypass startup configuration

解析：解析：Explanation:

[多选题]Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)

It operates without collisions

It provides faster data transfer

解析：解析：Explanation: