cisco ccna 认证考试 习题(1,2).docVIP

1. What is a global command? A. a command that is available in every release of IOS, regardless of the version or deployment status B. a command that can be entered in any configuration mode C. a command that is universal in application and supports all protocols D. a command that is implemented in all foreign and domestic IOS versions E. a command that is set once and affects the entire router Answer: E 2．On three different occasions an administrator configured a router, and after testing the configuration saved it to NVRAM by issuing the copy running-config startup-config command. After each successful save the administrator issued the reload command. Each time when the router restarted, the router appeared to have the default blank configuration. What could cause such results? A. The boot system commands were left out of the configuration. B. The NVRAM is corrupted. C. The configuration register setting is incorrect. D. The upgraded IOS just loaded is not compatible with the hardware. E. The upgraded configuration is not compatible with the hardware platform. Answer: C 3．Network users are complaining that they cannot access resources on the LAN attached to interface e0 of the Production router. Which of the following commands will display current IP addressing and the Layer 1 and Layer 2 status of this interface? (Choose three.) A. Production# show version B. Production# show protocols C. Production# show interfaces D. Production# show controllers E. Production# show ip interface F. Production# show startup-config Answer: BCE 4．The show interfaces serial 0/0 command resulted in the output shown in the graphic. What are possible causes for this interface status? (Choose three.) A. The interface is shut down. B. No keepalive messages are received. C. The clockrate is not set. D. No loopback address is set. E. No cable is attached to the interface. F. There is a mismatch in the encapsulation type. Answer: BCF 5．When upgrading the IOS image, the network administrator