[单选题]A receiving host has failed to receive all of the segments that it should acknowledge.What can the host do to improve the reliability of this communication session?

正确答案 ：E

Decrease the window size

解析：解析：Explanation:

[单选题]What kind of cable should be used to establish a trunked line between two Catalyst switches?

正确答案 ：E

A cross-over cable

解析：解析：Explanation: A crossover cable is used to connect two of the same device types, or devices from the same OSI layer.

[单选题]下列关于路由器和交换机的描述中，错误的是（）

正确答案 ：D

交换机可以转发广播

[单选题]配置路由器时，封装PPP协议的命令是：()

正确答案 ：A

encap ppp

[单选题]为了阻止交换机环路，交换机上所采用的技术为（）

正确答案 ：B

生成树协议

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