Saeed Darvish Pazoki – MCSE, CCNA IP Subnetting 1

Calculate Networks 2

Subnetting Examples Number of networks Process: 1. Determine The number of Networks and Convert to Binary 2. Reserve Bits in Subnet Mask and Find the INCREMENT 3. Use Increments to find the networks 3

Subnetting Examples Number of networks Class C Example #1: Mask: Required networks: 5 Binary:  3 bits Required Mask:  Increments Number: 32 ( ) Networks:

Subnetting Examples Number of networks Class C Example #2 : Mask: Required networks: 12 Binary:  4 bits Required Mask:  Increments Number: 16 ( ) Networks:

Subnetting Examples Number of networks Class C Example #3 : Mask: Required networks: 60 Binary:  6 bits Required Mask:  Increments Number: 4 ( ) Networks:

Subnetting Examples Number of networks Class B Example #1 : Mask: Required networks: 30 Binary:  5 bits Required Mask:  Increments Number: 8 ( ) Networks:

Subnetting Examples Number of networks Class B Example #2 : Mask: Required networks: 100 Binary:  7 bits Required Mask:  Increments Number: 2 ( ) Networks:

Subnetting Examples Number of networks Class B Example #3 : Mask: Required networks: 280 Binary:  9 bits Required Mask:  Increments Number: 128 ( ) Networks:

Subnetting Examples Number of networks Class A Example #1 : Mask: Required networks: 500 Binary:  9 bits Required Mask:  Increments Number: 128 ( ) Networks:

Subnetting Examples Number of networks Class A Example #1 : Mask: Required networks: 1000 Binary:  10 bits Required Mask:  Increments Number: 64 ( ) Networks:

Calculate Hosts 12

Subnetting Examples Number of Hosts Process: 1. Determine The number of Hosts and Convert to Binary 2. Reserve Bits in Subnet Mask and Find the INCREMENT 3. Use Increments to find the networks 13

Subnetting Examples Number of Hosts Class C Example #1: Mask: Required hosts: 50 Binary:  6 bits Required Mask:  Increments Number: 64 ( ) Networks: ( – ) ( – ) ( – ) ( – ) 14

Subnetting Examples Number of Hosts Class C Example #1: Mask: Required hosts: 100 Binary:  7 bits Required Mask:  Increments Number: 128 ( ) Networks: ( – ) ( – ) 15

Subnetting Examples Number of Hosts Class B Example #1: Mask: Required hosts: 100 Binary:  7 bits Required Mask:  Increments Number: 128 ( ) Networks: ( – ) ( – ) ( – ) ( – ) ( – ) ( – ) 16

Subnetting Examples Number of Hosts Class B Example #2: Mask: Required hosts: 300 Binary:  9 bits Required Mask:  Increments Number: 2 ( ) Networks: ( – ) ( – ) ( – ) ( – ) ( – ) 17

Subnetting Examples Number of Hosts Class B Example #2: Mask: Required hosts: 1500 Binary:  11 bits Required Mask:  Increments Number: 8 ( ) Networks: ( – ) ( – ) ( – ) ( – ) ( – ) 18

Reverse Calculations! 19

Subnetting Examples Finding the network of a given IP Address and Mask: / = bit = And Result = = 176  / / = bit = And Result = = 112  /29 20