What Is Subnetting

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What is Subnetting Page 1

What Is Subnetting

By: Dennine Queen

Professor Melanie Howard

Intro to Networking CIS 175

Due: August 15, 2010

What is Subnetting Page 2

What is Subnetting?

The purpose of this paper is to explain subnetting and why it is needed.

If you have a network that has an excessive amount of traffic and is starting to run slowly, you

need to find a way to solve this problem. One of the most effective techniques to solve this problem is

by subnetting.

Subnetting is a technique for breaking a big block of IP addresses into smaller blocks that can

be used to define separate networks. By subnetting a network administrator can enhance security,

improve performance and simplify troubleshooting. One of the main reasons of subnetting is

to help relieve congestion. Congestion was a big problem at one time because it was more common to

use hubs.

Before you subnet you need to sit down and figure out what needs to be subnetted; without

planning and knowing exactly what you are doing you could cause more harm than good. When you

are ready make sure that your subnet structure is the same as your network's geographic structure.

When subnetting make sure that it is linked through a router and each subnet should have its own hub

or switch.

When you subnetting you need to have a understanding of IP address. Each address is a 32 bit

number that is divided into 4 sections of 8 bits that are called octets. Each octet is converted from

binary to decmial form and separated with a dot to make it easier to read. As an example suppose you

have a Class C block of IP addresses and the address for that block is Since this is a class C

subnet your default subnet mask would be The network portion always remain fixed

for a particular network, while the remaining bits which make up the host portion can be altered to

give the range of addresses to assign...
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