正确答案: C

It is used to bypass the configuration in NVRAM.

题目：You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:o/r 0x2142

解析：解析：Explanation:

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学习资料的答案和解析：

[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

[单选题]帧中继环境下，为了区分虚电路，应该使用的地址是（）

DLCI

[多选题]属于私有IP段的是()

10.0.0.0-10.255.255.255

172.16.0.0-172.31.255.255

192.168.0.0-192.168.255.255

解析：ABD

[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]An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up.What does "line protocol is up" specifically indicate about the interface?

Keepalives are being received on the interface.

解析：解析：Explanation:

[多选题]In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

Forwarding

Learning

解析：解析：Explanation:

[单选题]What kind of cable should be used to establish a trunked line between two Catalyst switches?

A cross-over cable

解析：解析：Explanation: A crossover cable is used to connect two of the same device types, or devices from the same OSI layer.