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單項(xiàng)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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1.單項(xiàng)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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2.單項(xiàng)選擇題根據(jù)以下的配置，請(qǐng)判斷當(dāng)主接口serial0出故障后，哪一個(gè)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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3.單項(xiàng)選擇題訪問(wèn)控制列表配置中，操作符“greater-than portnumber”表示控制的是（）。

A.端口號(hào)小于此數(shù)字的服務(wù)
B.端口號(hào)大于此數(shù)字的服務(wù)
C.端口號(hào)等于此數(shù)字的服務(wù)
D.端口號(hào)不等于此數(shù)字的服務(wù)

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4.單項(xiàng)選擇題dialertimeridle這條命令的意思是設(shè)置（）。

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

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5.多項(xiàng)選擇題Which three statements about RSTP are true？（）

A.RSTP significantly reduces topology reconverging time after a link failure.
B.RSTP expends the STP port roles by adding the alternate and backup roles.
C.RSTP port atates are blocking，discarding，learing，orforwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed processas STP on point-to-pointlinks.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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