In a multicast network environment, if IGMPv2 hosts and IGMPv1 routers (hereinafter referred to as version 2 hosts and version 1 routers) are co-located on the same LAN, how do they work together? (Multiple Choices)

• A.The version 1 router treats the IGMPv2 report as an invalid IGMP message type and ignores it.
• B.When the Version 2 host detects that the IGMP Querier is a Version 1 router, it must always respond with the IGMPv1 report.
• C.When the version 1 router is a valid IGMP querier, the version 2 host must send an IGMPv1 report.
• D.When the version 2 host leaves, it still sends an IGMP leave message and the message cannot be suppressed

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Each DD packet has DD sequence number, which is used to confirm the DD packet. DD contains complete link status information.

• A.False
• B.True

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The following description of EGP and IGP, which is wrong?

• A.IGP is a routing protocol that runs inside an AS.
• B.EGP itself is an ancient protocol.
• C.IGP focuses on controlling the propagation of routes and selecting the optimal route.
• D.EGP is a routing protocol that runs between AS.

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The description of the LSA header information in the AS-External-LSA of OSPF, which is wrong?

• A.Net mask indicates the network mask of the destination network segment.
• B.Advertising Router indicates the router ID of ASBR.
• C.Forwarding Address is always 0.0.0.0.
• D.Link State ID indicates the destination network address.

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Compared to traditional unicast and broadcast, what can IP multicast be used to?

• A.Application in IPTV
• B.Reduce network load
• C.Effectively save network bandwidth
• D.Application in multimedia conferences

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