DATA LINK LAYER WIRED NETWORKS
WIRED LANS ETHERNET PROTOCOL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A switch repeats the message to a branch of the network ____
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only if the MAC address is on that branch.
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every time it receives a message.
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when there is a collision.
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None of the above
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Explanation:
Detailed explanation-1: -Explanation. When a switch receives a frame from a destination it does not know, it inserts the source mac address into its CAM table (a table which maps mac addresses to ports) and forwards the frame to all ports. The process of broadcasting a unicast frame is called unknown unicast.
Detailed explanation-2: -Learning. Let’s start with learning. Switches need to keep track of the MAC addresses of all connected devices. Without the learning function, the switch would not know to which port the destination device is connected.
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