DATA LINK LAYER WIRED NETWORKS
MULTIPLE ACCESS PROTOCOLS MAC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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unicast
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multicast
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broadcast
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none of the above
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Detailed explanation-1: -The destination address, however, can be unicast, multicast, or broadcast. Figure shows how to distinguish a unicast address from a multicast address. If the least significant bit of the first byte in a destination address is 0, the address is unicast; otherwise, it is multicast.
Detailed explanation-2: -The least significant bit of an address’s first octet is referred to as the I/G, or Individual/Group, bit. When this bit is 0 (zero), the frame is meant to reach only one receiving NIC. This type of transmission is called unicast.
Detailed explanation-3: -Correct option. The 43:7B:6C:DE:10:00 address could not be an Ethernet multicast destination address because the first byte of the address (43) does not have the first bit set to 1. This bit is used to indicate that the address is a multicast address.
Detailed explanation-4: -Ethernet MAC Address The MAC destination address (all 1 s) is used to identify a broadcast packet (sent to all connected computers in a broadcast domain) or a multicast packet (lsb of 1st byte=1) (received by a selected group of computers).