Azure Classroomnotes 19/Mar/2022

Networking Contd

• Subnets
  • consider the following scenario where a network of 2000 devices has to be created, so lets find the possible ip ranges for private network
    
  • Lets define the CIDR Notation and Subnet mask
    cidr: 192.168.0.0/21
sm: 11111111.11111111.11111000.00000000
  • In this network we have 4 blocks and each block requires 500 devices
    host id bits: 2^n ~= 500
host id bits = 9
network id bits = 32-9 = 23
  • Lets create subnets from the overall network 192.168.0.0/21
    “`

  </ul>
  <h1>overall network</h1>
  cidr: 192.168.0.0/21
  sm: 11111111.11111111.11111000.00000000
  overall sm: 11111111.11111111.11111000.00000000
  block sm: 11111111.11111111.11111110.00000000
  <hr />
  <pre><code> 11111111.11111111.11111xx0.00000000
  </code></pre>
  block 1 : 11000000.10101000.00000000.00000000 = 192.168.0.0/23
  block 2 : 11000000.10101000.00000010.00000000 = 192.168.2.0/23
  block 3 : 11000000.10101000.00000100.00000000 = 192.168.4.0/23
  block 4 : 11000000.10101000.00000110.00000000 = 192.168.6.0/23
  “`
  
  * Lets create 8 subnets for the following requirement
  
  * Lets find out network cidr

  devices = 8000
  
  2^n ~ = 8000
  number of host bits = 13
  network id bits = 32-13 = 19
  network cidr => x.x.x.x/19 => 172.16.0.0/19
  
  network sm: 11111111.11111111.11100000.00000000
  
  each floor requires 1000 devices
  2^n ~ = 1000
  host id bits = 10
  network id bits = 32-10 = 22
  
  network sm: 11111111.11111111.11100000.00000000
  block sm  : 11111111.11111111.11111100.00000000
  ------------------------------------------------
              11111111.11111111.111xxx00.00000000
  
  xxx => 000, 001, 010, 011, 100, 101, 110, 111
  
  ip: 10101100.00010000.00000000.00000000
  
  f1: 10101100.00010000.00000000.00000000 = 172.16.0.0/22
  f2: 10101100.00010000.00000100.00000000 = 172.16.4.0/22
  f3: 10101100.00010000.00001000.00000000 = 172.16.8.0/22
  f4:                                     = 172.16.12.0/22
  f5:                                     = 172.16.16.0/22
  f6:                                     = 172.16.20.0/22
  f7:                                     = 172.16.24.0/22
  f8:                                     = 172.16.28.0/22
  
  

  • We need to create a network for 2 lakh devices we have two datacenters and each datacenter in this network will have 1 lakh devices.

  overall network => 200000
  host bits => 18
  network id bits => 32-18 = 14
  
  overall network cidr: 10.0.0.0/14
  network sm: 11111111.11111100.00000000.00000000
  each subnet => 100000
  host bits => 17
  network id bits => 32-17 = 15
  network sm: 11111111.11111100.00000000.00000000
  subnet sm : 11111111.11111110.00000000.00000000
  ------------------------------------------------
              11111111.111111x0.00000000.00000000
  
  network:    00001010.00000000.00000000.00000000 = 10.0.0.0/14
  
  subnet1:    00001010.00000000.00000000.00000000 = 10.0.0.0/15
  subnet2:    00001010.00000010.00000000.00000000 = 10.2.0.0/15 
  

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