Collision Domain and Broadcast Domain plays an important role in networking when the device send and receive the data from each other.
Collision Domain is a set of LAN devices whose frames could collide with one another. This happens with hubs, bridges, repeaters and wireless routers as only one device can send and receive at a time. If more than one device tries to send or receive then the data or information is lost and irrecoverable and it will need to be resent.
Note: Remember, each port on a hub is in the same collision domain. Each port on a bridge, a switch or router is in a separate collision domain.
Broadcast Domain is a group of devices on a particular network segment that if one device sends a broadcast frame, all devices hear the broadcasts sent out on that particular network segment.
But even though a broadcast domain is usually a boundary delimited by physical media like switches and routers, the term can also refer to a logical division of a network segment where all host can communicate via a Data Link Layer, hardware address broadcast.
CSMA/CD stands for Carrier Sense Multiple Access/Collision Detection. It is an Ethernet networking protocol that helps devices to share the bandwidth evenly while preventing two devices from transmitting simultaneously on the same network medium. CSMA/CD was created to overcome the collisions problems that occur while transmitting the packet from different nodes at the same time.
- Hub has a single broadcast domain and collision Domain
- By default, each port of switch carries a single broadcast domain and per port collision Domain.
- Router has per port Collision and Broadcast Domain.
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