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单选题
Which IGMPv2 message contains a non-zero "Max Response Time"？（）
A
Membership Query
B
Membership Report
C
Membership Delay
D
Backward Compatible IGMPv1 Report Message
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单选题Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1？（）A
Before sending traffic, it must first join multicast group 239.1.1.1 by sending an IGMPv2 membership report to the default router on the local subnet.B
It must send an IGMPv2 Request to Send packet and then wait for an IGMPv2 Clear to Send packet from the IGMPv2 querier router on the local subnetC
It may begin transmitting multicast traffic to the group only when there is no other host transmitting to the group on the local subnet.D
It may transmit multicast traffic to the group at any time.
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