SUBNETTING

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What is Subnet

A subnetwork, or subnet, is a logical, visible subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting.

ADVANTAGES à

1.Find out wasted IP Address.

2.To provide security or block IP communication with each other.

3.Used for find out waste ip and broadcast ip ,this Ip address slow down the whole network.


4.Used for logical boundary.


SUBNET MASK

WHAT IS SUBNET MASK?

-IT DIFFERENTIATES NETWORK PORTION AND HOST PORTION IN AN IP.
-IT IS GIVEN FOR HOST ID OF NETWORK ID.
-REPRESENTS ALL NETWORK BITS WITH 1 AND 0 FOR ALL THE HOST BIT.

>>CLASS A:--N.H.H.H
DEFAULT S/M OF A
255.0.0.0
11111111.00000000.00000000.00000000
>>CLASS B:--N.N.H.H
DEFAULT S/M OF B
255.255.0.0
11111111.11111111.00000000.00000000
>>CLASS C:--N.N.N.H
DEFAULT S/M OF C
255.255.255.0
11111111.11111111.11111111.00000000

CALCULATING SUBNETTING
(by six formulas)

1.identify the class of ipaddress,and write down “extra on bits.

2.calculate new subnet mask.

3.calculate block size
[256-new s/m]

4.calculate no. of network
[2n (n=extra on bits)]

5.calculate no.of pc/network
[2H(H=off bits)]-2

6.make the table

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