MAC learning is a fundamental function in Ethernet switches that allows switches to build and maintain a table of MAC addresses associated with the ports through which they are learned. The correct option describing MAC learning is:
A. adds unknown source MAC addresses to the CAM table
Explanation:
When a switch receives an Ethernet frame, it examines the source MAC address in the frame's header.
If the MAC address is not already in the switch's Content Addressable Memory (CAM) table (also known as MAC address table), the switch adds an entry to the CAM table associating the MAC address with the port on which the frame was received.
This process is known as MAC learning.
Over time, the switch builds a table mapping MAC addresses to the ports through which they are learned, allowing it to forward frames more efficiently by only sending them out the appropriate port based on their destination MAC address.
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