单项选择题
Which statement is correct in reference to IPv6 multicast？（）
A.IPv6 multicast uses Multicast Listener Discovery.
B.The first 8 bits of an IPv6 multicast address are always FF （1111 1111）.
C.IPv6 multicast requires MSDP.
D.PIM dense mode is not part of IPv6 multicast.
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InFrameRelay，FECNmessagesindicatingcongestionaresentorreceivedbywhichoffollowing？（）
A.Sent by the destination
B.Received by the sender
C.Received by the destination
D.Sent by the sender -
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Priorto802.1w，Ciscoimplementedanumberofproprietaryenhancementsto802.1DtoimproveconvergenceinaLayer2network.Whichstatementiscorrect？（）
A.Only UplinkFast and BackboneFast are specified in 802.1w； PortFast must be manually configured.
B.Only PortFast is specified in 802.1w； UplinkFast and BackboneFast must be manually configured.
C.None of the proprietary Cisco enhancements are specified in 802.1w.
D.PortFast， UplinkFast， and BackboneFast are specified in 802.1w. -
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Auserhasnonetworkconnectivity.Acheckoftheassociatedportindicatesthattheinterfaceisup，thelineprotocolisdown.Whichitemwouldmostlikelycausethisproblem？（）
A.Speed mismatch
B.Incorrect encapsulation
C.MTU set too low
D.Duplex mismatch
