单项选择题

根据下图，假设路由器已经配置了默认配置，那么这个接口是（）。

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

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多项选择题

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

单项选择题

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

多项选择题

Host1正在试图和Host2联系。RouterC的e0接口是down的，以下选项正确的是？（）

A.RouterC会使用ICMP通知Host1&ldquo；Host2无法到达&rdquo；
B.RouterC会使用ICMP通知Host1&ldquo；Host1无法到达&rdquo；
C.RouterC会使用ICMP通知Host1，RouterA和RouterB&ldquo；Host2无法到达&rdquo；
D.RouterC会发送一个&ldquo；DestinationUnreachable&rdquo；的消息类型
E.RouterC会发送一个&ldquo；RouterSelection&rdquo；的消息类型
F.RouterC会发送一个&ldquo；SourceQuench&rdquo；的消息类型