Networking Basic Part6 Subnetting

06 08 2021
200.2.8.0
-divide this network into small subnets
-by changing of subnet mask

--based on no. of networks require
--based on no. of host per network/subnet

1. 100PC
2. 50pc
3. 25pc
4. 10pc

200.2.8.0
255.255.255.0
1. 100pc

no.of host per subnet(H)=100 ~=2^h-2=2^7-2 = 128-2= 126

h=7 , no of host bits (0's) h= 7
D.S.M = 255.255.255.0
1111 1111.1111 1111.1111 1111.0000 0000

1111 1111.1111 1111.1111 1111.1000 0000 - /25
C.S.M = 255.255.255.128
Customized Subnet Mask

1's represent network bit (n) n=1
no. of subnets = 2^n = 2^1 =2



200.2.8.0 or 200.2.8.0/25
255.255.255.128

200.2.8.0/25 -nw id
200.2.8.1 -1st valid ip address
-
200.2.8.126 -last valid address
200.2.8.127 - broadcast id
-----------
200.2.8.128/25

2. 50pc

H = 50 ~= 2^h-2=2^6-2=64-2=62
h=6 , no of host bits (0's)=6

1111 1111.1111 1111.1111 1111.1100 0000 -- /26
c.s.m = 255.255.255.192

network bits(1's) n=2
2^n=2^2 =4 subnetworks


200.2.8.128/26 -nw id
200.2.8.129 -1st valid ip address
-
200.2.8.190 -last vaild ip addrress 62+128
200.2.8.191 -b id
--------------------
200.2.8.192/26

3. 25pc

H=25 ~ 2^h-2=2^5-2=32-2=30

h=5 no of 0's =5

1111 1111.1111 1111.1111 1111.1110 0000 - /27
c.s.m = 255.255.255.224

n=3 : 2^n=2^3=8 no of subnets

200.2.8.192/27 -nw id
200.2.8.193 - 1st valid ip address
-
200.2.8.222 -last valid ip address -192+30
200.2.8.223 -b id
-----------------
200.2.8.224/27

------------------------

200. 2. 8.100/25 : 0110 0100
255.255.255.128 : 1000 0000
---------------- ---------
200. 2. 8.0 0000 0000


200. 2. 8.150/26 : 1001 0110
255.255.255.192 : 1100 0000
----------------- ---------
200. 2. 8.128 1000 0000


200. 2. 8.200/27 : 1100 1000
255.255.255.224 : 1110 0000
------------------- ---------
200. 2. 8.192 1100 0000
-------------------------------------------

192.168.2.133
-if subnet mask not mentioned means default subnet mask will apply
--if we use default subnet mask that network called as Class Full Network

192.168.2.133/28 or 192.168.2.133 255.255.255.240
-if your not using default subnet mask , you must mention S.M as / , S.M
--if we use Customized subnet mask that network called as Class Less

CIDR -Classless Inter Domain Routing
/ - slash notetion or CIDR method
- represent Subnet Mask
- prefix
---------------------------------------------


Question: How many subnets and hosts per subnet can you get from
the network 172.22.0.0/27?

255.255.0.0
255.255.255.224 /27

255.255.1111 1111.1110 0000 /27

n=8+3=11 2 ^ 11 = 2048 -no of networks/subnets

h=5 2^5 -2 = 30 no of host per subnet

https://youtu.be/oySkypYtS9U