單項選擇題

In order to allow the establishment of a Telnet session with a router, which set of commands must be configured（）。

A.A
B.B
C.C
D.D
E.E
F.F


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2.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.

5.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

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