CCNA Lesson - 25: Broadcast Domain vs Collision Domain

Section - 4: Understanding Roles and functions of different Network Components
Lesson - 25: Difference between Broadcast Domain and Collision Domain

In this video, we will talk about the Collision domain and broadcast domain in brief.

What is Collision Domain?
The term collision is used to describe an event that occurs when we use a shared medium to connect devices on an Ethernet network.
If a device sends out a message to the network, all devices within its collision domain are expected to pay attention to it, regardless of the intended recipient. The problem occurs when two devices are sending out their messages simultaneously, causing a collision that forces them to wait and retransmit each message in turn. It only occurs in the case of half-duplex mode.

What is Broadcast Domain?
The broadcast method of communication necessitates that the sending device sends a single copy of data that all the devices will receive in that segment. Broadcast Domains will receive any broadcast packet arising from any device within the network segment.
Whenever a device sends a broadcast message, all devices within its broadcast domain have to pay attention to it. Due to this, LAN congestion occurs in the network, affecting the bandwidth for other users on the network.

Thus, we can conclude that the more collision domains and more broadcast domains are present in a network, the more efficiently it will provide bandwidth to all its users.
We discuss this concept in detail, including how the router divides the broadcast domain in the upcoming videos when we will learn about each and every device.
In this video, we have discussed what collision domain is and what broadcast domain is!
Stay tuned to learn more!

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