Video Contents

Collision Domain

• Collision domain is a network segment in which collision can happen.
• It is a part of network where packet collision can occur.
• Collision domain applies in wireless networks and early version of ethernet networks.
• Collisions will happen in an Ethernet Network when two devices simultaneously try to send data on the Shared Media, since Shared Media is half-duplex and sending and recieving is not supported at same time.
• We call the media as shared media when the devices are connected together using Bus topology, or by using an Ethernet Hub.
• Collision happen in hub environment because every port of hub is in one collision domain.
• With full duplex communication we don’t have this collision challenge anymore.
• To deal with collision in wired network we use CSMA/CD and in wireless network we use CSMA/CA.

Broadcast Domain

• A Broadcast Domain consists of all the devices that will receive any broadcast packet originating from any device within the network segment. A group of devices that can reach to each other by using broadcast messages.
• We can not avoid broadcast because many protocols (like ARP and DHCP) use broadcast messages.
• Use destination IP 255.255.255.255.
• Repeater, hub, switch or bridge are in ONE Broadcast domain.A router is used to break a broadcast domain.