Lesson No. 2 Benefits of Segmenting a network using a Router

Have you checked our previous tutorial on Cisco's three tier network model. If you haven't, you must check it. Go to previous tutorial to have a look. In this tutorial i will explain how mush i's beneficial segmenting a network using a router. This is presented in Details. Have a look at it. 

Network segmentation is a way of dividing a big computer network (we can consider a network as a Broadcast Domain) into subnetworks, each being a network segment or network layer. A big network can be segmented to smaller subnets using a Router.

As the number of devices in the Broadcast Domain increases, number of Broadcasts also increases and the quality of the network will come down because of the following reasons.

1) Decrease in available Bandwidth: Large number of Broadcasts will reduce the available bandwidth of network links for normal traffic because the broadcast traffic is forwarded to all the ports in a switch. Every device in the broadcast domain wil receive the brodcast.

2) Decrease in processing power of computers: Since all the computers need to process allbroadcast packets, a huge portion of the computer CPU power is spent on processing the broadcastpackets. This will reduce the processing power of computers.

By default, routers don't pass broadcasts from one network segment to another network segment and therefore restrict the broadcast within the Broadcast Domain.

By segmenting a big broadcast domain into smaller smaller broadcast domains, we can keep the local broadcast traffic local. Routers drop unwanted traffic originating from one network to pass through the router to reach another network, thus increasing the bandwidth available to each user.

Another benifits of network segmentation using Routers include

Media Transition: Routers are used to connect networks of different media types. For example, one of your network segment may be using Tokenring as LAN Standard (just as an example, Tokenring is out from industry long way back) and other network segment is using Ethernet as the LAN Standard. A Router can be used to connect these different LAN Standards.

That's it, all done. Hope you had enjoyed it. Don't forget to check our next tutorial. Which will be on Unicast, Multicast, Broadcast, What is Unicast, What is Multicast and What is Broadcast. We will be discussing that in details.See you. :) :)