After the IGMP proxy device receives the report message of a certain multicast group, if the corresponding multicast group is not found, the IGMP proxy device will send a report message for the…

Question

Options

• ATRUE
• BFALSE

• A
  83% (57)
• B
  17% (12)

Explanation

A is correct because this describes the standard IGMP proxy behavior: when an IGMP proxy device receives a Membership Report for a multicast group it hasn't seen before, it forwards that Report upstream to the access (upstream) device to join the group on behalf of its downstream hosts, then records the group in its local forwarding table so future traffic can be delivered correctly.

B is wrong because the described sequence - forward the Report upstream, then update the forwarding table - is exactly how IGMP proxying is specified to work; there is no inversion or omission of steps.

Memory tip: Think of the IGMP proxy as a relay with memory - it first tells the upstream network "someone here wants this group" (sends the Report), then writes it down locally (updates the forwarding table). Report first, record second - the order matches the statement, so it's TRUE.

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