So, the destination MAC address of multicast traffic cannot be the burned-in MAC address of the network interface of an individual computer. But the multicast traffic is sent to a group of computers. Usually the destination MAC address for unicast type of network traffic is the burned-in MAC address of the receiving computer’s network interface. When an IPv4 datagram are sent as unicast, the Ethernet frame which is encapsulating the IPv4 datagram contains sender and receiver MAC addresses as the source and destination MAC addresses respectively. Address information at IPv4 datagram is source and destination IPv4 addresses, but the address information at layer 2 frame is source and destination MAC addresses. When a unicast data packet is sent to the network, the layer 3 (network layer) IPv4 datagram is encapsulated within layer 2 (datalink layer) frame. Why we need multicast IPv4 address to multicast MAC address mapping Advantages and disadvantages of multicast.What is directed broadcast in IPv4 and how directed broadcast works.What is limited broadcast in IPv4 and how limited broadcast works.IPv4 addresses, IPv4 Address Classes, IPv4 Address Classifications.IPv4 Protocol, IPv4 header and fields of IPv4 header.
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