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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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1.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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2.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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3.多項選擇題Which three are characteristics of an IPV6 anycast address?（）

A.any-to-many communication model
B.delivery of packets to the group interface that is closest to the sending device
C.one-to-many communication model
D.the same address for multiple devices in the group
E.one-to-nearest communication model
F.a unique IPV6 address for each device in the group

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4.單項選擇題You are working in a data center environment and are assigned the address range 10.188.31.0/23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements？（）

A.10.188.31.0/27
B.10.188.31.0/26
C.10.188.31.0/29
D.10.188.31.0/28
E.10.188.31.0/25

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5.單項選擇題下列哪項關于Cisco Catalyst交換機VLAN操作是正確的？（）

A.當從一個802.1Q中繼收到一個包時，VLAN ID可以從源MAC地址表確定
B.未知單播幀被重新傳輸只對屬于同一VLAN的端口
C.交換機之間的端口應該在接入模式被配置為使得VLAN可以橫跨端口跨越
D.廣播和多播幀被重發(fā)到在不同的VLAN配置的端口

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