Wednesday 16 January 2019
SUBNETTING
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
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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