1.Which switch command enables a trunking protocol that appends a four byte CRC to the packet?

 A. Switch(config-if)#switchport trunk encapsulation dot1q

 B. Switch(config-if)#switchport trunk encapsulation itef

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 C. Switch(config-if)#switchport trunk encapsulation fddi

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 D. Switch(config-if)#switchport trunk encapsulation isl 3COM华为网络.技术学院 http://www.3comcom.com

Answer:D 3COM华为.网络技术学院 http://www.3comcom.com

2.What action should a network administrator take to enable VTP pruning on an entire management domain?

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 A. enable VTP pruning on any client switch in the domain

 B. enable VTP pruning on every switch in the domain 3COM思科华为网络技术学院 www.3comcom.com

 C. enable VTP pruning on any switch in the management domain

 D. enable VTP pruning on a VTP server in the management domain

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Answer:D

3.Which of the following technologies uses a Root Link Query BPDU?

 A. BackboneFast

 B. PortFast

 C. UplinkFast 3COM思科网络技术.学院 http://www.3comcom.com

 D. STP standard

Answer:A

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4.Switch C is configured with UplinkFast. How much time will expire after a failure in L2 before switch C activates the port connected to L3?

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 A. 1-5 seconds

 B. 15 seconds 3COM华为.网络技术学院 http://www.3comcom.com

 C. 30 seconds

 D. 50 seconds

Answer:A

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