MAC ADDRESS TABLE
A MAC
ADDRESS TABLE, ALSO KNOWN AS A CONTENT ADDRESSABLE MEMORY (CAM) TABLE, IS A
TABLE THAT STORES THE MAC ADDRESSES OF THE DEVICES THAT ARE CONNECTED TO A
SWITCH. THE MAC ADDRESS TABLE IS USED BY THE SWITCH TO FORWARD DATA PACKETS TO
THE CORRECT DESTINATION DEVICE.
WHEN A
SWITCH RECEIVES A DATA PACKET, IT LOOKS UP THE DESTINATION MAC ADDRESS IN ITS
MAC TABLE. IF THE DESTINATION MAC ADDRESS IS IN THE TABLE, THE SWITCH KNOWS
WHICH PORT THE DEVICE IS CONNECTED TO AND CAN FORWARD THE PACKET DIRECTLY TO
THAT PORT.
IF THE
DESTINATION MAC ADDRESS IS NOT IN THE TABLE, THE SWITCH WILL BROADCAST THE
PACKET TO ALL OF ITS PORTS.
THE MAC
ADDRESS TABLE IS TYPICALLY STORED IN THE SWITCH'S MEMORY. THE SIZE OF THE MAC
ADDRESS TABLE DEPENDS ON THE NUMBER OF PORTS ON THE SWITCH. A SWITCH WITH A
LARGE NUMBER OF PORTS WILL NEED A LARGER MAC ADDRESS TABLE.
THE MAC
ADDRESS TABLE IS UPDATED DYNAMICALLY. WHEN A NEW DEVICE IS CONNECTED TO THE
SWITCH, THE SWITCH LEARNS THE MAC ADDRESS OF THE DEVICE AND ADDS IT TO THE MAC
ADDRESS TABLE.
WHEN A
DEVICE IS DISCONNECTED FROM THE SWITCH, THE SWITCH REMOVES THE MAC ADDRESS OF
THE DEVICE FROM THE MAC ADDRESS TABLE.
THE MAC
ADDRESS TABLE IS AN IMPORTANT PART OF HOW SWITCHES WORK. IT ALLOWS SWITCHES TO
FORWARD DATA PACKETS TO THE CORRECT DESTINATION DEVICE, WHICH IMPROVES THE
PERFORMANCE AND EFFICIENCY OF THE NETWORK.
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