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單項選擇題Which command is used to display the collection of OSPF link states?（）

A.show ip ospf lsa database
B.show ip ospf link-state
C.show ip ospf neighbors
D.show ip ospf database

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1.單項選擇題When you are troubleshooting an ACL issue on a router,which command can help you to verify which interfaces are affected by the ACL?（）

A.show ip access-list
B.show access-list
C.list ip interface
D.show interface
E.show ip interface

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2.多項選擇題 如圖，如果所有的鏈接都運行在相同的帶寬，哪些端口會被STP指定的端口？（）

A. Switch A - Fa0/0
B. Switch A - Fa0/1
C. Switch B - Fa0/0
D. Switch B - Fa0/1
E. Switch C - Fa0/0
F. Switch C - Fa0/1

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3.單項選擇題Three switches are connected to one anther via trunk ports.Assuming the default switch configuration,which switch is elected as the root bridge for the spanning-tree instance of vlan 1?（）

A.the switch with the lowest MAC address
B.the switch with the higest MAC address
C.the switch witch the higest IP address
D.the switch with the lowest IP address

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4.單項選擇題What is the purpose of the cisco Vlan Trunking protocol?（）

A.to provide a mechanism to dynamically assign vlan membership to switch ports
B.to allow traffic to be carried from multiple vlans over a single link between switches
C.to allow native vlan information to be carried over a trunk link
D.to provide a mechanism to manually assign vlan membership to switch ports
E.to allow for managing the additions,deletions,and changes of vlans between switchs

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5.多項選擇題802.1Q協(xié)議的特點是什么？（）

A.它是一個2層的消息協(xié)議，它保證通過網(wǎng)絡的VLAN配置
B.它包括一個8比特字段指定的幀的優(yōu)先級
C.它是專門用于標記的VLAN幀和下交換網(wǎng)絡拓撲結構的變化劑量不能滿足網(wǎng)絡的重新收斂
D.它修改802.3幀報頭，并且因此需要在FCS重新計算
E.它是一種能夠攜帶未標記的幀的中繼協(xié)議

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