Consider the operation of the IGMP protocol; when a router (querier) sends a group-specific query message to one of its subnets, how is the ACK (report message) explosion problem suppressed if there...

Consider the operation of the IGMP protocol; when a router (querier) sends a group-specific query message to one of its subnets, how is the ACK (report message) explosion problem suppressed if there are many subscribers to the multicast group?

Does DVMRP minimize the use of network bandwidth or end-to-end delay to each destination? Will a node receive multiple copies of the same packet? If yes, propose a new protocol such that all nodes will receive only one copy.