单项选择题

YouwanttoallowRouterR1toimmediatelybecometheactiverouterifitspriorityishighestthantheactiverouterfails.Whatcommandwouldyouuseifyouwantedtoconfigurethis？（）

A.enstandbypreempt
B.standbypreemptenable
C.standbypreempt
D.hotstandbypreempt
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单项选择题
panyhasimplementednumerousmultilayerswitchesthatutilizeFIBtables.WhichstatementistrueabouttheForwardInformationBase（FIB）table？（）
A.TheFIBisderivedfromtheIProutingtableandisoptimizedformaximumlookupthroughput.
B.TheFIBtableisderivedfromtheAddressResolutionProtocoltable，anditcontainsLayer2rewrite（MAC）informationforthenexthop.
C.WhentheFIBtableisfull，awildcardentryredirectstraffictotheLayer3engine.
D.TheFIBlookupisbasedontheLayer2destinationMACaddress.
E.Noneoftheotheralternativesapply
单项选择题
SwitchR1hasbeenconfiguredwithPrivateVLANs.WiththattypeofPVLANportshouldthe defaultgatewaybeconfigured？（）
A.Trunk
B.Isolated
C.Primary
D.Community
E.Promiscuous
F.Noneoftheotheralternativesapply
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