Learn more about Subnetting & Supernetting

In this session, we will learn about the concept and calculation method of subnetting and super netting. Understanding subnet masks is the most important point to understand IP addresses clearly.

 

It's literally a sub. You can think of it as a mask that you put on to make a network through some processing, not the main. In other words, once we're assigned an IP address, we don't usually use it as it is.

 

For example, you received a Class B address. Can I just use this? A network has 65,000 hosts, but with such a large network, the effects of broadcasting are so great that you probably can'

 

 

So you have to share it. Use a subnet mask when cutting IP addresses, just as you use a knife when cutting meat. You divide the network by putting a subnet mask on the original IP address that you're given.

 

 

1. Subneting

 

 

- Separate a given network address into smaller subnets

 

- A mask to distinguish the portion of the network identifier is called a subnet mask.

 

 

IP is 192.168.10.0 Subnetmask is 255.255.255.0

▶ Number of networks: 1/ Number of hosts: 255 available hosts 192.168.10.1 to 192.168.10.254

 

 

 

 

From now on, 255 hosts will be grouped into one network and sub-netted into multiple networks through subnetting.

 

After converting to binary, change 2 to 1 for 8 zeros and subnet mask is 255.255.255.192

 

▶ Number of networks: 4 / Number of hosts: 64

 

Available Hosts (After Subnetting)

 

192.168.10.1 to 192.168.10.62 (hosts divided into separate networks)

192.168.10.65 ~ 192.168.10.126

192.168.10.129 ~ 192.168.10.190

192.168.10.193 ~ 192.168.10.254

 

Number of hosts 255 One network can be separated into four networks 64 hosts through subnetting A large network can be separated into several smaller networks (Broadcast Domains) through subnetting

 

 

* Reasons for using subnetting

 

1) To design a network effectively by dividing the number of networks and the number of hosts into several

 

2) Effective network configuration by reducing unnecessarily large Broadcast Domain

 

3) IPv4 has a limited allocation address, so it is used to use IP efficiently

 

 

 

 

 

2. Supernetting

 

 

- The task of merging networks divided by the opposite of subnetting

 

IP is 192.168.10.0 Subnetmask is 255.255.255.0

 

▶ Number of networks: 1/ Number of hosts: 255

Available Hosts 192.168.10.1 to 192.168.10.254

 

It is believed that the number of people who used to be 250 increased to 350 as the number of people was added, and the work of making it a network that 350 people can use through super netting.

 

 

< supernetting >

 

 

After super netting, IP is 192.168.10.0 Subnetmask is 255.255.254.0

▶ Number of networks: 1/ Number of hosts: 512

Available Hosts 192.168.10.1 to 192.168.11.254

After super netting, you can combine the two C classes into one network and use them.

 

We've talked about subnetting and super netting. I don't know if it was easy to get the concept. I'll give you a question at the end to review, so please solve it.

 

In addition, sub-netting and super-netting are easily familiar if you do it often through various configurations, so I recommend you to try it often with a different configuration.

 

 

 

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