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. What is MAC address or Layer 2 address or physical address.TCP/IP Data Encapsulation and Decapsulation.Binary Decimal and Hexadecimal numbers and conversions.I strongly suggest you to visit and learn below lessons before reading further about multicast IPv4 address (Class D address) to IPv4 multicast MAC address mapping. We have learned that Class D multicast IPv4 addresses ranging from 224.0.0.0 to 239.255.255.255 are reserved as IPv4 multicast addresses. In this lesson, we will learn about multicast IPv4 address (Class D address) to IPv4 multicast MAC address mapping. We have learned about Class D multicast IPv4 addresses in last lesson. Multicast IPv4 address to MAC address mapping
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