Azure Classroom Series – 09/Jul/2020

Networking contd..

• Create a network which can help in connecting 2000 devices
  • the host id size should connect to 2000 devices
  • 2^n ~= 2000 answer would n is 11 as 2^11 = 2048
  • Now host size would be 11 bits
  • What should be ip addresss range? It is better to use private network cidr ranges
  • Private cidr ranges
    • 10.0.0.0/8
    • 172.16.0.0/12
    • 192.168.0.0/16
  • Lets choose any one of the above ranges

  iprange: 192.168.0.0/21
  subnet mask: 11111111.11111111.11111000.00000000
                255.255.248.0
  

  • What would be ip address range for connecting to 3000 devices on your network?

  2^n ~= 3000 n = 12
  ip range: 172.16.0.0/20
  subnet mask: 11111111.11111111.11110000.00000000
               255.255.240.0
  

  • What would be ip address range for connecting to 100000 devices on your network

  2^n ~= 100000  n = 17
  ip range: 10.0.0.0/15
  subnet mask:  11111111.11111110.00000000.00000000
                255.254.0.0
  

  • Generally we would not work with one complete network, we try to break network into smaller sub networks and these smaller networks are called as subnets.

Networks and Subnets

• Lets try to create subnets from a network

network ip range: 192.168.0.0/16
subnet mask: 255.255.0.0
network id: 192.168
size = 65000

lets try to create a subnet which can connect to 200 devices
2^n ~= 200 n = 8

ip range: 192.168.0.0/24
subnet mask: 255.255.255.0
network id 192.168.0
size = 250

lets create two more subnets which can connect 200 devices each
192.168.00000001.00000000
subnet 2: 192.168.1.0/24
192.168.00000010.00000000
subnet 3: 192.168.2.0/24

• Lets try to create subnets from a network

network ip range: 10.10.0.0/16
subnet mask: 255.255.0.0

now lets create two subnets which can connect to 1000 devices
2^n ~= 1000 n = 10

ip address: 10.10.0.0/22
subnet mask = 11111111.11111111.11111100.00000000
            = 255.255.252.0

ip address: 10.10.4.0/22
subnet mask = 11111111.11111111.11111100.00000000

• Lets create subnets (subnet1, subnet2) which can connect to 200 and 500 devices

ip address range: 172.16.0.0/16
subnet mask: 255.255.0.0

subnet1 : 172.16.0.0/24
2^n ~= 200 n = 8

subnet2: 
2^n ~= 500 n = 9
172.16.0000001   0.00000000 => 172.16.2.0/23
255.255.254.0

• Try to calculate subnet cidr ranges for the office network shown below