## Networking Contd..

• Creating networks based on number of devices to be connected
• While creating networks, we use ip address ranges reserved for private networking.
``````10.0.0.0 â€“ 10.255.255.255
172.16.0.0 â€“ 172.31.255.255
192.168.0.0 â€“ 192.168.255.255
``````
• Creating the networks with more flexibility
``````ip: 192.168.0.4
sm: 255.255.255.0

nid  192.168.0
hid  4

size of the network => 2^8-2 = 256-2 = 254

sm => 255.0.0.0 => 24 => 2^24-2
255.255.0.0 => 16 => 2^16-2  => 65534
255.255.255.0  => 8 => 2^8-2
255.255.255.0
11111111.11111111.11111111.00000000 => 8 => 2^8-2 => 254
11111111.11111111.11111111.10000000 => 7 => 2^7-2 => 126

Create a network with 20 devices =>

2^n ~= 20 n = 5

11111111.11111111.11111111.11100000
255.255.255.224

find number of 0's for a network of size 2500

2^n ~= 2500
n = 12  (number of zeros = 12)
N => 32-12 => 20 (number of ones)
11111111.11111111.11110000.00000000
255.255.240.0
``````
• Find the subnet masks for the network with following size requirements
• 10
``````2^n ~= 10
n (number of 0 ) = 4
N (number of 1) => 32-4 => 28
SM: 11111111.11111111.11111111.11110000
: 255.255.255.240
IP: x.x.x.x/28 (CIDR Notation)
``````
• 100000
``````2^n ~= 100000
n = 17
N = 32-17 = 15
SM: 11111111.11111110.00000000.00000000
255.254.0.0
CIDR: x.x.x.x/15
``````
• 5200
``````2^n ~= 5200
n = 13
N = 32-13 = 19
SM: 11111111.11111111.11100000.00000000
: 255.255.224.0
CIDR: x.x.x.x/19
``````
• Lets expand the following CIDR Range
``````ip range: 192.168.0.0/24
sm: 11111111.11111111.11111111.00000000
range ip: 192.168.0.0 - 192.168.0.255

cidr: 192.168.0.0/16
sm: 11111111.11111111.00000000.00000000
ip range: 192.168.0.0 - 192.168.255.255

cidr: 192.168.0.0/22
SM: 11111111.11111111.11111100.00000000
ip range: 192.168.0.0 - 192.168.3.255

cidr: 10.0.0.0/20
SM: 11111111.11111111.11110000.00000000
ip range: 10.0.0.0 - 10.0.15.255
``````
• For the CIDR ranges reserved for private networking refer below

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