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單項(xiàng)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(xiàng)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(xiàng)選擇題 哪個(gè)目的地址將被用于主機(jī)A發(fā)送數(shù)據(jù)到主機(jī)C？（）

A.交換機(jī)1的IP地址
B.交換機(jī)1的MAC地址
C.主機(jī)C的IP地址
D.主機(jī)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(xiàng)選擇題路由發(fā)生在DOD模型的哪一層？（）

A.應(yīng)用
B.網(wǎng)絡(luò)
C.傳輸

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4.多項(xiàng)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(xiàng)選擇題哪三種說法準(zhǔn)確描述2層以太網(wǎng)交換機(jī)？（）

A.微分割減小了網(wǎng)絡(luò)上的沖突次數(shù)。
B.如果交換機(jī)收到一個(gè)幀一個(gè)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(jī)自動(dòng)共享VLAN信息。
D.在一個(gè)功能正常的網(wǎng)絡(luò)冗余的交換路徑，每個(gè)交換環(huán)節(jié)將包含其轉(zhuǎn)發(fā)狀態(tài)的所有端口一個(gè)根橋。在廣播域中所有其它交換機(jī)將只有一個(gè)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(jī)使基于第2層和第3層地址信息轉(zhuǎn)發(fā)決策。

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