问答题

WhichthreefieldsareoptionalinanOSPFv3externalLSA？（）

A.ForwardingAddress
B.ExternalRoute
C.ReferenceLink-StateID
D.Option
E.PrefixOptions

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WhichtwotunnelingtechniquessupportIPv6multicasting？（）

A.6to4
B.6over4
C.ISATAP
D.6PE
E.GRE

ThenetworkadministratorwantstoenableanEtherChannelbetweentwoswitchesin'on'mode.Theadministratorconnectsthecablesandenablestheinterfaces，butwhileconfiguringtheEtherChannelinthefirstswitch，aspanning-treeloopwasdetected.Whichtwooftheseprocedurescanavoidthisproblem？（）
A.ConfiguretheEtherChannelas"desirable"first.
B.AssignallinterfacestothesameVLAN.
C.DisablePortFastontheinterfacesintheEtherChannels.
D.Disableallinterfacesfirst.
E.FastEthernetandGigabitEthernetportscannotbeassignedtothesameEtherChannel.
F.Fixcablingproblems.

A.Theadministratorconnectsthecablesandenablestheinterfaces，butwhileconfiguringtheEtherChannelinthefirstswitch，aspanning-treeloopwasdetected.Whichtwooftheseprocedurescanavoidthisproblem？（）
A.ConfiguretheEtherChannelas"desirable"first.
B.AssignallinterfacestothesameVLAN.
C.DisablePortFastontheinterfacesintheEtherChannels.
D.Disableallinterfacesfirst.
E.FastEthernetandGigabitEthernetportscannotbeassignedtothesameEtherChannel.
F.Fixcablingproblems.