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31 Days Before Your CCENT Certification by Scott Bennett

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CCNA Discovery 1, Chapter 3

3.4.3 and 3.4.4: The following key points, as highlighted on Day 28, are characteristics of a switch:

• An Ethernet device with multiple ports that de-encapsulates each frame to read the source and destination MAC addresses.

• A switch maintains a MAC table that tracks which hosts are attached to each port. The switch reads the source MAC address from an incoming frame and adds the address to the table as located at the incoming port.

• A switch uses the MAC address table to forward frames based on the destination MAC address.

• When two hosts on a switch communicate, the switch creates a temporary circuit between the devices and forwards only the frames between those ports. Not all hosts connected to a switch share ...

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