AWS Classroomnotes 02/Feb/2023

Networking

• Design a network with
  • 3 subnets of 130 devices each
  • 5 subnets of 100 devices each
• 3 subnets of 130 devices each

subnet

variable = 8
fixed = 24
SM:  11111111.11111111.11111111.00000000
     11111111.11111111.111111yy.00000000

subnets: 192.168.0.0/24, 192.168.1.0/24, 192.168.2.0/24
network: 192.168.0.0/22

• 5 subnets of 100 devices each

subnet
variable = 7
fixed = 25
SM:  11111111.11111111.11111111.10000000
     11111111.11111111.111111yy.y0000000
subnets: 192.168.0.0/25, 192.168.0.128/25, 192.168.1.0/25, 
         192.168.1.128/25, 192.168.2.0/25

Network: 192.168.0.0/22

Rules

• When we create any network we cannot use 2 ip addresses
  • when all zeros in variable => Network id
  • when all ones in variable => broadcast id
• Forumla in general networks with v as variables bits

size = 2^v - 2
note:
in AWS this formual would be 2^v - 5 

• When we create network rules to forward the network packets or to block the network packets in firewalls we generally use cidr ranges. In these cidr ranges are used to figure out network id.

192.168.0.0/24 => Any ip with pattern 192.168.0.x
10.10.0.0/16 => Any ip with pattern 10.10.x.x
0.0.0.0/0 => Any ip address x.x.x.x
100.101.102.103/32 => Specific ip 100.101.102.103

Home internet connection and rough relation to AWS

• Home network
  
• AWS Network (VPC)
  
• Rougly similar