21: Which of the following commands would you type to see this output shown in the figure above?
　　A. Show interface Ethernet 0/0

　　B. Show ip interface detail

　　C. Show interface Serial 0/1

　　D. Show ip interface brief

　　
　　22: Your routers at ACME, Inc., are having some connectivity issues. You issue show commands for each connecting router's interface. Why are they unable to communicate (see figures above)?

　　A. Incorrect IP address

　　B. Wrong routing protocol

　　C. Bad cable

　　D. Encapsulation mismatch
　　
　　23: You need to back up the configurations you just made, but no TFTP servers are available. Which of the following commands are options to back up your currently running configuration? (Choose two.)

　　A. Router1#copy running-config startup-config

　　B. Router1#copy running-config flash

　　C. Router1#copy startup-config running-config

　　D. Router1#copy running-config http
　　
　　24: You are consulting a small business that is establishing its first WAN link. The client wants to know what encapsulation you will be using on the link. Which of the following are valid encapsulations for WAN links? (Choose three.)

　　A. Frame relay

　　B. Ethernet

　　C. Token ring

　　D. PPP

　　E. HDLC
　　
　　25: Your boss is concerned about security on your network. She wants to make sure that no one can identify passwords if he or she happens to view a configuration on your router. What command encrypts all passwords on your router?

　　A. Router1#service password-encryption

　　B. Router1(config)#service password-encryption

　　C. Router1#enable secret password

　　D. Router1(config)#enable secret password
　　
　　26: You need to set up a password that will prevent unauthorized users from telnetting into your router. What series of commands would you use?

　　A. Acme1(config)# line console 0
　　Acme1(config-line)# password acme
　　Acme1(config-line)# login

　　B. Acme1(config)# line vty 0
　　Acme1(config-line)# enable password acme

　　C. Acme1(config)# line vty 0
　　Acme1(config-line)# enable secret acme
　　Acme1(config-line)# login

　　D. Acme1(config)# line vty 0
　　Acme1(config-line)# password acme
　　Acme1(config-line)# login

　　
　　27: When you are setting up your serial interfaces, what does the clockrate command do for your connection?

　　A. Establishes the timing at which you send data

　　B. Establishes keepalives

　　C. Establishes the advertised bandwidth

　　D. Establishes the time on the router
　　
　　28: You need to set up passwords on all your default Telnet lines. What command would you start with?

　　A. Router1(config)#telnet configuration

　　B. Router1(config)#interface Ethernet 0/1

　　C. Router1(config)#line vty 1 5

　　D. Router1(config)#line vty 0 4
　　
　　29: You can execute show commands at which prompt? (Choose two.)

　　A. Router1#

　　B. Router1(config)#

　　C. Router1(config-router)#

　　D. Router1>

　　E. romon1>
　　
　　30: You are configuring your router and type in an Enable password and an Enable Secret password. Your fellow network technician asks you why you have two passwords set when you need only one. What do you tell him?

　　A. The Enable password is used by low-level applications.

　　B. If you reverted to an older version of the IOS, it would not understand the Secret password.

　　C. Both passwords are treated the same.

　　D. It is a failsafe method of ensuring that people need to type two passwords instead of just one.

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