What is IGMP (Internet Group Message Protocol)?

Internet Group Message Protocol permits a few devices to share one IP address so they would all be able to get similar information. IGMP is a network layer protocol used to established multicasting on networks that use the Internet Protocol version 4 (IPv4). IGMPpermits the organization to direct multicast transmissions only to hosts. It permits more effective utilization of assets when supporting these kinds of uses. IGMPv1 was created in 1989 at Stanford University. IGMPv1 was updated to IGMPv2 in 1997 and again updated to IGMPv3 in 2002.