Sub-netting is the process of dividing a large network into smaller networks to control network traffic, preserve address space, and improve security. It involves using routers between networks and subnet masks to identify the network and node portions of IP addresses. The document discusses how to subnet class A, B, and C networks by dividing the single address range into multiple smaller ranges to support more physical networks.

1. Sub-netting
Student Name:-Bobbili Ramesh
Student Number:-3719339

2. Sub netting
• The process of dividing the large network into
the possible smaller Network.
Reasons:-
• Control network traffic
• Preserve Address Space
• Security

3. How to subnet?
• Routers are used between different networks to
control the flow of
data or packets.
• Router is nothing but a
Hardware network device that transmits data
based on the preset conditions of transmission and
security.

4. Without Sub-netting

5. With sub-netting

6. Sub net masking
• Sub-net mask allows to identify the Network and Node of the Address.
 Network bits are denoted by 1’s.
 Node bits are denotes by 0’s.
• There are three subnet masks.
Class A
255.0.0.0-1111.0000.0000.0000
Network.Host.Host.Host
Class B
255.255.0.0-1111.1111.0000.0000
Network.Network.Host.Host
Class C
255.255.255.0-1111.1111.1111.0000
Network.Network.Network.Host

7. Subnetting Class A
• class A address:
– Is made of a one-byte netid and a three-byte
hostid
– Can have one single physical network with up to
16.777.214 (224-2)
– If we want more physical networks, we can divide
this one range into several smaller ranges

8. Subnetting Class B
• class B:
– Is made A two byte netid and two-byte hostid
– Can have one single physical network and up to
65,534 hosts on the network.
– If we wan more physical network, we can divide
this one big range into several smaller ranges.

9. Subnetting Class C
• class C address:
– is made of a three byte netid and one-byte hostid
– Can have one single physical network and up to
254 (28 – 2) host on that network
– If we want more physical network, we can divide
this one range into several smaller range.

11. References:-
1. LeFebvre, William. December 01, 1997. Proper subnetting.
UNIX review 15, no. 13, (accessed August 29, 2011).
2. http://www.tcpipguide.com/free/t_IPSubnetMasksNotation
andSubnetCalculations-4.htm