The correct statement about the IGMP proxy is ? Multi-select

The downstream interface of the IGMP proxy device generates multicast relay table items
IGMP proxy can detect the link status with the linkage through the information of the member host joining/leaving the multicast group, and realize the rapid switching of the primary and standby device links
IGMP proxy is typically deployed on devices between hosts that are members of the access device
The
IGMP proxy device cannot send query messages to downstream member hosts in place of the IGMP queryer to maintain group membership

Answer(s): A,B,C

If a router only needs to forward iPv6 packets, you do not need to configure any IPV4 agreements and addresses on that router.

Answer(s): A

What descriptions of the OSPF protocol are correct?

AS-External-LSA describes the router's path to ASBR
The cost value of the second type of external route is only the AS external cost value, ignoring the AS internal cost value
AS-External-LSA does not belong in any region
AS-External-LSA describes the path to the as outside of the route, and the scope of the flood is the AS outside

Answer(s): B,C

The following description of ISIS's routed infiltration is correct?( Multi-select)

Answer(s): A,D

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