Concept of IP multicasting

Answer 1

The idea is to send a message to several recipients at once. On the backbone of the network, a message might be sent only once; later, when the paths to the recipients separate, several copies are made. This can help save bandwidth of the internet backbone (or other, smaller, networks), in certain circumstances. Multicasting is especially useful if the same information is to be sent to all recipients at the same time. A typical case might be a live radio or television broadcast over the Internet.

The idea is to send a message to several recipients at once. On the backbone of the network, a message might be sent only once; later, when the paths to the recipients separate, several copies are made. This can help save bandwidth of the Internet backbone (or other, smaller, networks), in certain circumstances. Multicasting is especially useful if the same information is to be sent to all recipients at the same time. A typical case might be a live radio or television broadcast over the Internet.

The idea is to send a message to several recipients at once. On the backbone of the network, a message might be sent only once; later, when the paths to the recipients separate, several copies are made. This can help save bandwidth of the Internet backbone (or other, smaller, networks), in certain circumstances. Multicasting is especially useful if the same information is to be sent to all recipients at the same time. A typical case might be a live radio or television broadcast over the Internet.

The idea is to send a message to several recipients at once. On the backbone of the network, a message might be sent only once; later, when the paths to the recipients separate, several copies are made. This can help save bandwidth of the Internet backbone (or other, smaller, networks), in certain circumstances. Multicasting is especially useful if the same information is to be sent to all recipients at the same time. A typical case might be a live radio or television broadcast over the Internet.

Answer 2

When you send a packet across the network, it is typically destined for one host and one host only. This is called single casting. You "cast" (tell) the message to a single host.

However, there comes a time when a message needs to be sent to more than one person at a time. For example, when you are telling a joke to your friends - all of your friends in the immediate area are supposed to hear the joke, but nobody outside of them should hear it - this is called multicasting - you "cast" the message to multiple select hosts.

On some occasions, your message needs to go out to absolutely everybody, such as a winter storm warning - this is called broadcasting - you cast the message to a broad range of hosts.

Answer 3

The idea is to send a message to several recipients at once. On the backbone of the network, a message might be sent only once; later, when the paths to the recipients separate, several copies are made. This can help save bandwidth of the Internet backbone (or other, smaller, networks), in certain circumstances. Multicasting is especially useful if the same information is to be sent to all recipients at the same time. A typical case might be a live radio or television broadcast over the Internet.