Table of Contents
Collision Domains
A collision domain is a set of LAN interfaces whose frames could collide with each other, but not with frames set by any other devices in the network. The collision occurs when two computers want to use bandwidth at the same time. Generally speaking in easy terms, A collision domain is a set of PC for which a frame sent by one PC could result in a collision with a frame sent by any other PC in the same collision domain.
Only one device in the collision domain may transmit at any one time, and the other devices in the domain listen to the network in order to avoid data collision. The collision also decrease network efficiency on a collision domain; if two devices transmit simultaneously, a collision occurs, and both devices must retransmit at a later time.
Modern wired networks use a network switch to eliminate collision. By connecting each device directly to a port on the switch, either each port on a switch becomes its own collision domain in case of half-duplex links or the possibility of collisions is eliminated entirely in the case of full-duplex links.
Broadcast Domains
A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged to other LAN segments.When one of the devices sends a broadcast, all the other devices receive a copy of the broadcast. For example, switches flood broadcasts and multicasts on all the ports. Because broadcast frames are sent out all ports, a switch creates a single broadcast domain.
Any computer connected to the same switch is a member of the same broadcast domain. Routers and other higher-layer devices form boundaries between broadcast domains.
Collision domains are generally smaller than broadcast domains. Broadcast domains are only divided by layer 3 network devices such as a router or layer 3 switches.
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