听力原文：M: Jenny, could you prepare the report for tomorrow's meeting？W: OK. I'll do it r

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P address 203.125.12.23. You suspect that there is a problem with your protocol stack. Which of the following actions is most likely to confirm your diagnosis？（）

A. ping 127.0.0.0

B. ping 203.125.12.1

C. telnet 127.0.0.1

D. ping 127.0.0.1

E. tracert 203.125.12.1

" command to save changes. After reloading the router, the router comes up in setup mode. You again make changes, save them, and reboot. Again,the router comes up in setup mode.What is the most likely cause of this？（）

A. The NVRAM is corrupted.

B. The boot system commands were omitted in the configuration.

C. The configuration register setting is incorrect.

D. The upgraded configuration incompatible with the hardware platform.

E. The upgraded IOS incompatible with the hardware.

accomplish this, access list 1 has been written to allow host 172.16.1.224 access to the router vty lines.What command would assign this access- list to the Virtual Terminal Lines？（）

A. router(config-line)# ip access-group 1 in

B. router(config-line)# access-class 1 in

C. router(config-line)# ip access-list 1 in

D. router(config-line)# access-line 1 in

A. >

B. #

C. ？

D. *

E. All of the above

F. None of the above

ists.You then enter the command "ip access-group 101 in" to apply access control list 101 to router TK1s e0 interface.Which of the following Telnet sessions will be blocked as a result of your access lists？（）

A. Telnet sessions from host A to host 5.1.1.10

B. Telnet sessions from host A to host 5.1.3.10

C. Telnet sessions from host B to host 5.1.2.10

D. Telnet sessions from host B to host 5.1.3.8

E. Telnet sessions from host C to host 5.1.3.10

F. Telnet sessions from host F to host 5.1.1.10

F operation. You notice that router A and router B are stuck in the two - way state. From the show ip ospf interface command output, what is the cause of this issue？（）

A. All OSPF implementations must have at le ast one interface in area 0.

B. You are attempting to run in the broadcast mode over an NBMA interface.

C. Both routers are configured to function as a BDR; therefore, there is no DR router.

D. Someone has changed the OSPF router ID; therefore you must clear the OSPF process.

E. The OSPF priority is set to 0 on both routers; therefore neither can become the DR.

A．enable

B． configure

C． edit

D． cli

P address 203.125.12.23. You suspect that there is a problem with the IP protocol stack in your PC. Which of the following actions is most likely to confirm your diagnosis？

A. ping 127.0.0.0

B. ping 203.125.12.1

C. telnet 127.0.0.1

D. ping 127.0.0.1

E. tracert 203.125.12.1

F. None of the above