X.25使用映射的作用是（）。

单项选择题X.25使用映射的作用是（）。

A.映射本地IP到对端端口值，以便路由器发送数据时确认发送端口
B.映射本地IP到本地端口值，以便路由器发送数据时确认发送端口
C.映射对端IP到本地端口值，以便X.25交换网络查找数据发送路径
D.映射对端IP到对端端口值，以便X.25交换网络查找数据发送路径

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参考答案：带宽；延迟

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A.150.150.0.0
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3.多项选择题All of the routers in the network are configured with the ip subnet-zero command. Which network addresses should be used for Link A and Network A (Choose two.)（）。

A.Network A - 172.16.3.48/26
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4.多项选择题 The switches shown in the diagram, Core and Core2, are both Catalyst 2950s. The addressing scheme for each company site is as follows:Router Ethernet port - 1st usable addressCore - 2nd usable addressCore2 - 3rd usable addressFor this network, which of the following commands must be configured on Core2 to allow it to be managed remotely from any subnet on the network? （）

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5.单项选择题Which type of EIGRP route entry describes a fesible successor？（）

A.a primary route，stored in the routing table
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6.单项选择题无类路由协议路由表表目为三维组，其中不包括（）。

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A.the session layer
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