CCENT Exam: How Does a Switch Work

The following will describe how a switch in a local area network works:

1. Switches start with an empty table
2. A computer plugged into the switch sends data trying to get to another computer
3. The switch receives this frame and puts the senders MAC Address in its table
4. Because the switches table is empty it then broadcasts the destination address out every port
5. When the destination computer responds the switch puts its MAC Address in its table
6. Now that the switch knows where the sender and the receiver are it sets up a point-to-point connection.

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