Compare and contrast unicast, broadcast, and multicast communications at the MAC sublayer
What will be an ideal response?
Unicast, broadcast, and multicast are all 48-bit MAC address types. All of them can be desti
nation MAC addresses. Only unicast can be a source address. A unicast address is a unique
address used when a frame is sent from a single transmitting device to a single destination
device. In the case of a broadcast, the frame is destined for all devices in the broadcast
domain and is addressed to a MAC broadcast address of 48 1s (or FF-FF-FF-FF-FF-FF in
hexadecimal). With multicast, a source can send to a group of devices. The low-order bit of
the first byte must be a 1 for the address to be a multicast. If the multicast is also an IP multi
cast, the first 24 bits of the MAC address are 01-00-5E in hexadecimal.
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