AWS Classroomnotes 30/Jan/2023

Network Basics

Lets create a network to connect 100 devices

• Solution

Subnet mask

255.255.255.0  => 1 octet => 8 =>2^8 =256
255.255.0.0    => 2 octets => 16 => 2^16 = 65536
255.0.0.0      => 3 => 24 => 16777216
private 
192.168.0.0 to 192.168.255.255
172.16.0.0 to 172.31.255.255
10.0.0.0 to 10.255.255.255

Size = 100

SM: 255.255.255.0
ip: 192.168.0.x
ip: 192.168.100.x
ip: 172.16.0.x
ip: 10.0.0.x

Lets create a network to connect 1000 devices

• Solution

Subnet mask

255.255.255.0  => 1 octet => 8 =>2^8 =256
255.255.0.0    => 2 octets => 16 => 2^16 = 65536
255.0.0.0      => 3 => 24 => 16777216

private 
192.168.0.0 to 192.168.255.255
172.16.0.0 to 172.31.255.255
10.0.0.0 to 10.255.255.255

Size = 1000

SM: 255.255.0.0
ip: 192.168.x.x
ip: 172.18.x.x
ip: 10.100.x.x

Lets try to create a network with 1 lakh devices

• Solution

Subnet mask

255.255.255.0  => 1 octet => 8 =>2^8 =256
255.255.0.0    => 2 octets => 16 => 2^16 = 65536
255.0.0.0      => 3 => 24 => 16777216

private 
192.168.0.0 to 192.168.255.255
172.16.0.0 to 172.31.255.255
10.0.0.0 to 10.255.255.255

Size = 100000

SM: 255.0.0.0
ip: 10.x.x.x

Classless Interdomain routing (CIDR)

• CIDR Notation is a way of ip addressing where we write range in the form of x.x.x.x/f

192.168.0.0/24

fixed = 24
variable = 32-24 = 8

ip: 192.168.0.xxxxxxxx
SM: 11111111.11111111.11111111.00000000

range = 192.168.0.0 to 192.168.0.255

192.168.10.0/23

fixed = 23
variable = 9

IP:           192.168.0000101x.xxxxxxxx
SM= 11111111.11111111.11111110.00000000

range: 192.168.10.0 - 192.168.11.255

10.128.0.0/12

fixed = 12
variable = 20

IP:       10.1000xxxx.xxxxxxxx.xxxxxxxx     
SM= 11111111.11110000.00000000.00000000

range: 10.128.0.0 to 10.143.255.255

192.168.192.0/21

fixed = 21
variable = 11

IP:           192.168.11000xxx.xxxxxxxx
SM= 11111111.11111111.11111000.00000000

range: 192.168.192.0 to 192.168.199.255

172.16.0.0/12

fixed = 12
variable = 20

IP:      172.0001xxxx.xxxxxxxx.xxxxxxxx      
SM= 11111111.11110000.00000000.00000000

range: 172.16.0.0 to 172.31.255.255


00010000 => 16
00011111 => 31