General and Group-Specific Query Processes

General and Group-Specific Query Processes
One enhancement that was made to IGMPv2 processes was the creation of a new query type.
The Membership Query, as it was called in IGMPv1, was renamed General Queries, and the
new type is Group-Specific Query. The new query type is used to query a specific multicast
group (kind of obvious from the name). The overall procedure is the same as it is in IGMPv1.
When multiple IGMPv1 routers existed on the same segment, a multicast routing protocol
made the decision as to which of all the multicast routers would perform the Membership Queries.
Now, the decision is made by using a feature added to IGMPv2. This feature is known as the
Querier Election Process.
The frame for the query was changed to enable a maximum response time that allows the hosts
on the segment more time to respond to the query. This reduces the bursty traffic on the network.