单项选择题
As a network administrator， can you tell me what the root guard feature provides in a bridgednetwork？（）
A.It ensures that BPDUs sent by the root bridge are forwarded in a timely manner
B.It enforces the root bridge placement in the network
C.It ensures that all ports receiving BPDUs from the root bridge are in the forwarding state.
D.It ensures that the bridge is elected as root bridge in the network.
相关考题
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单项选择题
WhichstatementiscorrectinreferencetoIPv6multicast？（）
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. -
单项选择题
InFrameRelay，FECNmessagesindicatingcongestionaresentorreceivedbywhichoffollowing？（）
A.Sent by the destination
B.Received by the sender
C.Received by the destination
D.Sent by the sender -
单项选择题
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.
