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A collision is the situation that occurs when two or more demands are made simultaneously on equipment that can handle only one at any given instant. It may refer to:
- Collision domain, a physical network segment where data packets can "collide"
- Carrier sense multiple access with collision avoidance, (CSMA/CA) used for example with wireless LANs
- Carrier sense multiple access with collision detection, (CSMA/CD) used with Ethernet
- Late collision, a specific type of collision that shouldn't occur on properly operating networks