單項選擇題

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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單項選擇題

In Frame Relay， FECN messages indicating congestion are sent or received by which of following？（）

A.Sent by the destination
B.Received by the sender
C.Received by the destination
D.Sent by the sender

單項選擇題

Prior to 802.1w， Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）

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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Which statement is correct in reference to IPv6 multicast？（）

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In Frame Relay， FECN messages indicating congestion are sent or received by which of following？（）

Prior to 802.1w， Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）

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Which statement is correct in reference to IPv6 multicast？（）

In Frame Relay， FECN messages indicating congestion are sent or received by which of following？（）

Prior to 802.1w， Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）