單項選擇題If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20，what is the maximum number of host sallowed on this subnet？（）

A.4094
B.1024
C.8190
D.2046
E.4096


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1.單項選擇題Why will a switch never learn a broadcast address？（）

A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by aswitch.

4.單項選擇題訪問控制列表配置中，操作符“greater-than portnumber”表示控制的是（）。

A.端口號小于此數(shù)字的服務
B.端口號大于此數(shù)字的服務
C.端口號等于此數(shù)字的服務
D.端口號不等于此數(shù)字的服務

5.單項選擇題dialertimeridle這條命令的意思是設置（）。

A.鏈路空閑時間
B.忙端口的空閑時間
C.鏈路斷開時間
D.端口數(shù)據(jù)可以發(fā)送等待時間