Membership Query

Membership Query
The Query message is used to determine if there are any extant members in a particular group.
Two types of query exist: Group-Specific Queries and Group-and-Source-Specific Queries.
Group-Specific Queries If a host receives an IGMPv3 Group-Specific Query in its sourcespecific
range, it must respond with a report.
Group-and-Source-Specific Queries An IGMPv3 router will query any source-specific channel
that a host has requested to leave with a Group-and-Source-Specific Query. Hosts must
respond to any Group-and-Source-Specific Query for which both the group and source match
any channel to which they are subscribed.