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單項選擇題Which Cisco IOS diagnostics command can disrupt the operation of a router under high-load conditions?（）

A.show running-config
B.show processes cpu
C.debug all
D.logging host ip address

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1.單項選擇題哪個命令可以在交換機(jī)啟用RSTP？（）

A. spanning-tree mode rapid-pvst
B. spanning-tree uplinkfast
C. spanning-tree backbonefast
D. spanning-tree mode mst

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2.單項選擇題Which command encrypts all plaintext passwords?（）

A.Router(config)#password-encryption
B.Router(config)#service password-encryption
C.Router#service password-encryption
D.Router# password-encryption

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3.多項選擇題哪兩個命令可以用來驗證給定的Cisco交換機(jī)的中繼鏈路的狀態(tài)？（）

A. show interfaces interface
B. show interfaces trunk
C. show interfaces switchport
D. show ip interface brief
E. show interfaces vlan

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4.多項選擇題Which can be done to secure the virtual terminal interfaces on a router？（）

A.Administratively shut down the interfaces.
B.Physically secure the interfaces.
C.Configure a virtual terminal password and login process.
D.Enter an access list and apply it to the terminal interfaces using the access-class command.
E.Create an access list and apply it to the terminal interfaces using the access-group command

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5.多項選擇題Which two statements about using the CHAP authentication mechanism in a PPP link are true?（）

A.CHAP uses a two-way handshake
B.CHAP authentication periodically occurs after link establishment
C.CHAP has no protection from playback attacks
D.CHAP authentication is performed only upon link establishment
E.CHAP uses a three-way handshake
F.CHAP authentication passwords are sent in plaintext

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