1. Broadcast :
Broadcast transfer (one-to-all) techniques and can be classified into two types : Limited Broadcasting, Direct Broadcasting. In broadcasting mode, transmission happens from one host to all the other hosts connected on the LAN. The devices such as bridge uses this. The protocol like ARP implement this, in order to know MAC address for the corresponding IP address of the host machine. ARP does ip address to mac address translation. RARP does the reverse.
2. Multicasting :
Multicasting has one/more senders and one/more recipients participate in data transfer traffic. In multicasting traffic recline between the boundaries of unicast and broadcast. It server’s direct single copies of data streams and that are then simulated and routed to hosts that request it. IP multicast requires support of some other protocols such as IGMP (Internet Group Management Protocol), Multicast routing for its working. And also in Classful IP addressing Class D is reserved for multicast groups.
Difference between Broadcast and Multicast :
|1.||It has one sender and multiple receivers.||It has one or more senders and multiple receivers.|
|2.||It sent data from one device to all the other devices in a network.||It sent data from one device to multiple devices.|
|3.||It works on star and bus topology.||It works on star, mesh, tree and hybrid topology.|
|4.||It scale well across large networks.||It does not scale well across large networks.|
|5.||Its bandwidth is wasted.||It utilizes bandwidth efficiently.|
|6.||It has one-to-all mapping.||It has one-to-many mapping.|
|7.||Hub is an example of a broadcast device.||Switch is an example of a multicast device.|