الجمعة، 5 يونيو 2015

Collision domain and broadcasting

 : Collision domains 
 a part of a network where packet collisions can occur. A collision occurs when two devices send a packet at the same time on the shared network segment. The packets collide and both devices must send the packets again, which reduces network efficiency. Collisions are often in a hub environment, because each port on a hub is in the same collision domain. By contrast, each port on a bridge, a switch or a router is in a separate collision domain.
Router: every port at a router is collision domain.
Switch: every port at a switch is collision domain.
Hub : all is one collision domain

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broadcast domain :
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. A broadcast domain encompasses a set of devices for  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 ports. Because broadcast frames are sent out all ports, a switch creates a single broadcast domain.

Router: every port at a router is broadcast
Switch: every port at a switch is broadcast

For more examples about collision domain visit

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