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Question 15:

Under IGMP version 1, must a node wait for a membership query time interval to pass before joining a multicast group?

Yes, the router(s) connecting to the LAN periodically poll the network requesting group member nodes to join.
Yes, multicast nodes periodically send multicast join statements (every 60 seconds) on the Local Area network. To join a multicast group, the node timer must time-out before broadcasting/advertising the desire to join a multicast group.
No, when a network node wants to join a multicast group, the node sends a host membership request to the all-router group address of 224.0.0.2.
No, when a network node wants to join a multicast group, the node establishes the group IP address that the local router will use. Subsequent nodes request multicast group membership from the router.