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單項選擇題 根據(jù)下圖，假設(shè)路由器已經(jīng)配置了默認(rèn)配置，那么這個接口是（）。

A.Ethernet
B.Fast Ethernet
C.Gigabit Ethernet
D.asynchronous serial
E.synchronous serial

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1.多項選擇題Why do large OSPF networks use a hierarchical design?（）

A.to confine network instability to single areas of the network.
B.to reduce the complexity of router configuration
C.to speed up convergence
D.to lower costs by replacing routers with distribution layer switches
E.to decrease latency by increasing bandwidth
F.to reduce routing overhead

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2.單項選擇題 A TCP/IP Transfer is diagrammed in the exhibit.A window size of three has been negotiated for this transfer. Which message will be returned from the receiver to the sender as part of this TCP/IP transfer?（）

A.Send ACK 1-3
B.Send ACK 3
C.Send ACK 4
D.Send ACK 4-6
E.Send ACK 6
F.Send ACK 7

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3.多項選擇題 Host1正在試圖和Host2聯(lián)系。RouterC的e0接口是down的，以下選項正確的是？（）

A.RouterC會使用ICMP通知Host1&ldquo；Host2無法到達(dá)&rdquo；
B.RouterC會使用ICMP通知Host1&ldquo；Host1無法到達(dá)&rdquo；
C.RouterC會使用ICMP通知Host1，RouterA和RouterB&ldquo；Host2無法到達(dá)&rdquo；
D.RouterC會發(fā)送一個&ldquo；DestinationUnreachable&rdquo；的消息類型
E.RouterC會發(fā)送一個&ldquo；RouterSelection&rdquo；的消息類型
F.RouterC會發(fā)送一個&ldquo；SourceQuench&rdquo；的消息類型

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4.單項選擇題How many subnets can be gained by subnetting 172.17.32.0/23 into a /27 mask, and how many usable host addresses will there be per subnet?（）

A.8 subnets, 31 hosts
B.8 subnets, 32 hosts
C.16 subnets, 30 hosts
D.16 subnets, 32 hosts
E.A Class B address can't be subnetted into the fourth octet.

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5.單項選擇題 As a network administrator，you have been instructed to prevent all traffic or iginating on the LAN from entering the R2 router.Which the following command would implement the access list on the interface of theR2 router？（）

A.access-list 101 in
B.access-list 101 out
C.ipaccess-group 101 in
D.ipaccess-group 101 out

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