Collision Domain

A collision is the result of two devices or hosts on the Ethernet network attempting to transmit data at exactly the same time.

A collision domain is an area of a network where collisions can happen.

If more number of devices are in a single collision domain then the chances of collision also increases. As the devices in a single collision domain share the available bandwidth, the increased collisions will result in a low quality network.

A hub creates a single collision domain that means all interfaces of a hub are in a single collision domain.

Switches create a single collision domain for each interface; as a result devices connected to the different interface of a single switch are in a different collision domain.

Every interface of router also creates a single collision domain. (As well as a single broadcast domain)

Collision Domain

In figure, a HUB connected to four hosts and a router creates a single collision domain and a SWITCH creates three collision domains, two with hosts and one with router as every interface of switch is in a single collision domain.

#DV

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