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Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?A．Serial0/1 is up, line protocol is downB．Serial0/1 is down, line protocol is downC．Serial0/1 is up, line protocol is upD．Serial0/1 is administratively d

题目

Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?

A．Serial0/1 is up, line protocol is down

B．Serial0/1 is down, line protocol is down

C．Serial0/1 is up, line protocol is up

D．Serial0/1 is administratively down, line protocol is down

E．None of the above

参考答案和解析
正确答案：B
解析：Explanation:
When the physical interface itself is down, then the problem is related to layer 1. When it is up, but the line protocol is down, then the problem is related to layer 2.

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相似问题和答案

第1题：

TestKing.com is configuring the serial interface of a Cisco router to connect to the router of a new ISP. A full T1 is being used for the Internet connection. After issuing the show interface serial 0/0 command, it is observed that the interface is UP and the line protocol is DOWN.Which of the following commands could fix this problem?（）

A. Border# copy running-config startup-config

B. Border(config)# no shutdown

C. Border(config-if)# encapsulation ppp

D. Border(config-if)# no cdp enable

E. Border(config-if)# ip routing


参考答案：C

第2题：

Part of the configuration files for routers testking1 and testking2 are displayed below:If you were to enter the "show interface serial 0" command on router testking1,which of the following will be displayed?（）

A. Serial 0 is down, line protocol is down

B. Serial 0 is up, line protocol is up

C. Open: IPCP, CDPCP

D. LCP closed

E. LCP open


参考答案：B, E

第3题：

如果链路的一端被管理DOWN,你将看到的另一端接口状态输出信息是()

A.interface is down，line protocol is down

B.interface is down，line protocol is up

C.interface is up，line protocol is down

D.interface is up，line protocol is up


参考答案：C

第4题：

You enabled CDP on two Cisco Routers which are connected to each other. The Line and Protocol statusfor the interfaces on both routers show as UP but the routers do not see each other a CDP neighbors.Which layer of the OSI model does the problem most likely exist？（）

  • A、Physical
  • B、Session
  • C、Application
  • D、Data-Link
  • E、Network

正确答案:D

第5题：

当学生A用两台Star—R2624路由器在做路由器广域网口连通实验时误将本端口路由器V.35线缆的插头插倒了。结果发现PING直连的路由器不通,请问此时需要查看路由器的状态应该是()

A.Serial 0 is up，line protocol is down

B.Serial 0 is down，line protocol is down

C.Serial 0 is down，line protocol is up

D.Serial 0 is administratively down，line protocol is


参考答案：A

第6题：

While logged into a router you manually shut down the serial 0 interface using the "shutdown" interface configuration command. You then issue the "show interface serial 0" command in exec mode. What could you expect the status of the serial 0 interface to be?（）

A. Serial 0 is up, line protocol is up

B. Serial 0 is up, line protocol is down

C. Serial 0 is down, line protocol is down

D. Serial 0 is down, line protocol is up

E. Serial 0 is administratively down, line protocol is down

F. Serial 0 is administratively down, line protocol is up


参考答案：E

第7题：

Which line from the output of the show ip interface command indicates a layer 1 problem?()

A. Serial0/1 is up, line protocol is down

B. Serial0/1 is down, line protocol is down

C. Serial0/1 is up, line protocol is up

D. Serial0/1 is administratively down, line protocol is down


参考答案：B

第8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?

A．The cable is attached properly.

B．CDP has discovered the connected device.

C．Keepalives are being received on the interface.

D．A carrier detect signal has been received from the connected device.

E．IP is correctly configured on the interface.


正确答案：C
解析：Explanation:
Serial 0/0 is up, line protocol is up is the proper status line condition.
Line serial0/0 is up: This statement represents that the physical connection is good.
Line protocol is up: This represents that the data link layer is OK, meaning that layer 2 keepalives are being received on the interface.
When the line protocol goes down, a possible problem is keep-alives not being sent by remote router.

第9题：

当用户端cisco路由器上用showinterface命令时line和lineprotocal可能出现的几种组合?()。

A.line down；line protocol down

B.line down；line protocol

C.line up；line protocol down

D.line up；line protocol up


参考答案：A, C, D

第10题：

A TestKing.com technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show cdp neighbors command. In which OSI layer is the problem most likely occurring?（）

  • A、Physical
  • B、Data link
  • C、Network layer
  • D、Transport layer
  • E、Application layer

正确答案:B

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