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For questions about network switches, the term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model.

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Collision domain in full duplex mode switch

For example, consider the link from the switch to PC3. Physically, no collision could possibly occur. … However, if PC3 and the LAN switch both enabled half-duplex, which uses CSMA/CD, they would consider their frames to collide if they were sent and received at the same time. …
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