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單項選擇題In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?（）

A.255.255.255.240
B.255.255.255.254
C.255.255.255.252
D.255.255.255.0
E.255.255.255.248

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1.多項選擇題What are three benefits of implementing vlans?（）

A.A more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure
B.Broadcast storms can be mitigated by decreasing the number of broadcast domains,thus increasing their size.
C.A higher level of network security can be reached by separating sensitive data traffic from other network traffic.
D.Port-based vlans increase switch-port use efficient,thanks to 802.1Q trunks
E.A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.
F.Broadcast storms can be mitigated by increasing the number of broadcast domains,thus reducing their size.
G. VLANs make it easier for IT staff to configure new logical groups,because the vlans all belong to the same broadcast domain.

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2.多項選擇題 哪個目的地址將被用于主機A發(fā)送數(shù)據(jù)到主機C？（）

A.交換機1的IP地址
B.交換機1的MAC地址
C.主機C的IP地址
D.主機C的MAC地址
E.路由器的E0接口的IP地址
F.路由器的E0接口的MAC地址

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3.單項選擇題路由發(fā)生在DOD模型的哪一層？（）

A.應用
B.網絡
C.傳輸

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4.多項選擇題Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard？（）

A.alternate
B.backup
C.designated
D.disabled
E.root

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5.多項選擇題哪三種說法準確描述2層以太網交換機？（）

A.微分割減小了網絡上的沖突次數(shù)。
B.如果交換機收到一個幀一個未知的目的地，它使用ARP解析地址。
C.生成樹協(xié)議允許交換機自動共享VLAN信息。
D.在一個功能正常的網絡冗余的交換路徑，每個交換環(huán)節(jié)將包含其轉發(fā)狀態(tài)的所有端口一個根橋。在廣播域中所有其它交換機將只有一個根端口。
E.建立的VLAN增加廣播域的數(shù)量。
F.配置有VLAN的交換機使基于第2層和第3層地址信息轉發(fā)決策。

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