In Ethernet; Broadcast and multicast addresses always describe a group of recipients. on the other hand; Unicast is used to explain communication where data is sent from one point to another point. In this case, a packet is sent from a single source to a specified destination. All Ethernet and IP networks support this type of transmission.A unicast MAC address is the unique address used when a packet is sent from a single transmitting device to a single destination device.
In the example shown, a host-A the source of the packet with IPv4 address 172.17.0.1 sending a packet to host-C which is a destination with IPv4 unicast address 172.17.0.10. For sending a unicast packet from source to destination, a destination IP address must be in the IP packet header. A destination MAC address must also be present in the Ethernet frame header. The IP address and MAC address combine to deliver data to a specific destination host.
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