题目内容

Whichtwostatementsabout10GigabitEthernet（10GE）aretrue？（）

A. 10GigabitEthernetdoesnotsupportVLANdefinition
B. 10GigabitEthernetsupportsfullduplexlinks，butdoesnotsupporthalfduplexlinks
C. 10GigabitEthernetsupportsunshieldedorshieldedtwisted-paircableconnections
D. 10GigabitEthernetsupportsCarrierSenseMultipleAccesswithCollisionDetection（CSMA/CD）
E. 10GigabitEthernetsupportsopticalfiberconnectionsinsinglemodeonly.Muftimodeisnotsupported

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WhichstatementisFALSEconcerningConcatenation？（）

A. ItallowsITCMtosendmultipleupstreampacketsinonesinglelargeburst.
B. Itreducesupstreamdatathroughput.
C. Itcanbeenabled/disabledfromCMTSonperupstreamportbasisifdesired
D. Concatenationactivityonaninterfacecanbecheckedbytheshowcontrollercounterscommand

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WhichtwostatementsaboutVPLSaretrue？（）

A. Thereisafullmeshofpseudowires.
B. Thereisapartialmeshofpseudowires.
C. OnlyL2TPv3canbeusedforpseudowireestablishment.
D. Thereissplit-horizontoavoidloops.

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Whatarethreefeaturesofvoicetrafficonanetwork？（）

A. bursty
B. constant
C. bandwidthintensive
D. smallpacketsizes
E. time-sensitive
F. retransmittable

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WhatisTCI？（）

A. TagCallingInterface
B. TagControlIdentifier
C. ToSClassInterface
D. TagControlInformation

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