Internet Group Management Protocol (IGMP)

The IP protocol may be included in the two types of communications: unicast and multicast. Unicast - Communication between a single transmitter and one receiver. This is a direct link. However, some processes sometimes need to send the same message to a large number of receivers simultaneously. This is called spamming many addresses, which is one-to-many. Multicast has many applications. For example, many brokers may be simultaneously informed of the change in stock price, or travel agents can be informed of the cancellation of the trip. Some other applications include distance learning and video on demand.