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31 Days Before Your CCENT Certification by Scott Bennett

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Day 25: Media Access Control and Segmentation

When Ethernet devices in the same collision domain attempt to communicate at the same time, a collision occurs. Each device detects the collision and waits a random amount of time before attempting to retransmit. Hosts on an Ethernet network use this process to ensure that only one host transmits at a time on a single collision domain; this process is often called carrier sense multiple access collision detect (CSMA/CD).

A switch increases the number of collision domains because it filters and forwards frames based on the source and destination MAC. A switch’s ability to divide collision domains is often called microsegmentation of the network. However, switches still forward all frames with FFFF.FFFF.FFFF ...

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