问答题

Whichthreeofthesestatementsaboutpenultimatehoppoppingaretrue？（）

A.Itisusedonlyfordirectlyconnectedsubnetsoraggregateroutes.
B.ItcanonlybeusedwithLDP.
C.Itisonlyusedwhentwoormorelabelsarestacked.
D.ItenablestheEdgeLSRtorequestalabelpopoperationfromitsupstreamneighbors.
E.ItisrequestedthroughTDPusingaspeciallabelvaluethatisalsocalledtheimplicit-nullvalue.
F.ItisrequestedthroughLDPusingaspeciallabelvaluethatisalsocalledtheimplicit-nullvalue.

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给了两段documentation里的描述，问这个时候发哪种类型的ICMP包。Theinterfaceonwhichthepacketcomesintotherouteristhesameinterfaceonwhichthepacketgetsroutedout.ThesubnetornetworkofthesourceIPaddressisonthesamesubnetornetworkofthenext-hopIPaddressoftheroutedpacket.

A.ThesubnetornetworkofthesourceIPaddressisonthesamesubnetornetworkofthenext-hopIPaddressoftheroutedpacket.

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WhichthreeprotocolsshouldbeexplicitlymanagedbyusingaCoPPpolicyonanInternetborderrouter？（）

A.SMTP
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E.RTP
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