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IGMP interface group report information
Ethernet6/1/1(40.1.1.1):

The preceding information shows the entry status of an IGMP interface on Ethernet 6/1/1 on a router.
Assume IGMP sends the group-and-source-specific Query message. Which of the following statements is true?

A. IGMP respectively sends two messages: The source carried in one of the messages is 20.1.1.56 with the S flag bit not set; the source carried in the other
message is 20.1.1.57, with the S flag bit set to 1.

B. IGMP respectively sends two messages: The source carried in one of the messages is 20.1.1.56 with the S flag bit set to 1; the source carried in the other
message is 20.1.1.57, with the S flag bit not set.

C. IGMP sends one message carrying two sources 20.1.1.56 and 20.1.1.57, with the S flag bit set to 1.

D. IGMP sends one message carrying two sources 20.1.1.56 and 20.1.1.57, with the S flag bit not set.

Explanation:

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