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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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1.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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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.

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3.單項選擇題As witch is configured as a vtp sever with a domain name of CCNA.Which cisco ios privileged mode command，followed by a reload of the swith，will reset the VTP management domain name of the switch to a NULL value？（）

A.#vtp domain unset
B.#delete vlan.dat
C.#no vtp domain
D.#vtp domain null

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4.單項選擇題根據(jù)以下的配置，請判斷當(dāng)主接口serial0出故障后，哪一個備份接口最先被啟用？（）[Quidway-Serial0]standby interface serial 1 30[Quidway-Serial0]standby interface serial 2 40[Quidway-Serial0]standby logic-channel 3 50[Quidway-Serial0]standby logic-channel 2 35

A.serial 1
B.serial 2
C.logic-channel 2
D.logic-channel 3

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

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