A collision domain refers to a segment of a computer network where data packets from multiple devices can collide if they are transmitted simultaneously over a shared medium. This concept is most relevant in older Ethernet networks using half-duplex communication, such as those connected via hubs or repeaters, where all devices compete for the same bandwidth. Collisions occur because the devices cannot transmit and receive at the same time, leading to data corruption that requires retransmission, which reduces network efficiency.
In modern networks, devices like switches and routers break up collision domains by creating separate segments for each port, allowing full-duplex communication where data can flow in both directions without interference. For example, in a hub-based setup, the entire network is one big collision domain, but a switch turns each connected device into its own isolated domain.
Here’s a diagram illustrating collision domains in a network:
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