Whichstatementistrueabouttheroutingtable?（）
A. Theroutingtableexistsinthecontrolplaneonly.
B. Theroutingtableexistsinthecontrolplaneandintheforwardingplane.
C. Theroutingtablecontainsbothactiveandinactiveroutes.
D. Theroutingtableisstoredoncompactflash.
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WhichCLIcommanddisplaysthecurrentlyconnectedPPPoAsubscribers?（）
A. showusers
B. showsubscribers
C. showaaasubscriber
D. showconnectedsubscriber
YouhavebeenaskedtoconfigureyourMX240withadefaultroutetowardyourupstreamISPatIPaddress192.168.100.1.Whichcommandsuccessfullycompletesthistask?（）
A. user@router#setrouting-optionsstaticroute0.0.0.0/0next-hop192.168.100.1
B. user@router#setrouting-optionsdefaultroute0.0.0.0/0next-hop192.168.100.1
C. user@router#setforwarding-optionsstaticroute0.0.0.0/0next-hop192.168.100.1
D. user@router#setprotocolsdefaultroute0.0.0.0/0next-hop192.168.100.1
WhenmultiplePPPoverEthernetsubscribersconnectusingthesameDSLmodem,whichtwoattributesdoestheERXusetodifferentiatebetweensubscribers?（）(Choosetwo.)
A. PPPsessionID
B. subscribername
C. sourceMACaddress
D. destinationMACaddress
（）年诞生了第一台全光数字计算机。
A. 1990
B. 1992
C. 1980
D. 1982
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