Subnetting & IP Calculator.

Subnetting & IP Calculator. 

Subnetting:

Subnetting is the process of dividing large networks into smaller networks. Here are some things to keep in mind when doing a subnet:

128	192	224	240	248	252	254	255
1	2	3	4	5	6	7	8

With this clause in mind, any subnetting is possible.

Why this subnetting?

By creating smaller networks (instead of larger networks), we get better security, fewer calls and broadcast networks, and greater administrative control of each network.

Let's try to get an example:

There is no block in a city, there is only one long road. Now if the postmen want to give a letter to someone named Sijan Saheb that will be the problem. There may be many people named Sijan on this road, in which case it would be like a racketeering madman. But if there are so many blocks on this road, one can easily find out which block of Season Sahib.

This is the same scenario with an IP, by creating smaller networks, we can get information on each host more effectively.

Class C subnetting:

We already know the first 24 bit network ID of class C and the rest 8-bit host ID. If the number of network IDs is higher and the host ID number is lesser, then we will select Class C IP.

C class-type network is described below:

[The number of networks here is how many networks will be, how many hosts will be hosted and how many subnets are the subnet IDs.]

Typical of these types on the interview board (192.16.10.0)

One block will tell you how many networks there are and how many hosts there are in each network.

Since we see the network as a c-class network then we understand that 24bit is being used for the network. Since / 28 then 24bit is omitted then 4-bit as per the above clause then it is 240. This is a subnet mask.