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Saeed Darvish Pazoki – MCSE, CCNA IP Subnetting 1
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Calculate Networks 2
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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
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Subnetting Examples Number of networks Class C Example #1: 198.200.100.0 Mask: 255.255.255.0 Required networks: 5 Binary: 0 0 0 0 0 1 0 1 3 bits Required Mask: 11111111.1111111.11111111.11100000 255.255.255.224 Increments Number: 32 (128 64 32 16 8 4 2 1) Networks: 198.200.100.0 198.200.100.32 198.200.100.64 198.200.100.96 198.200.100.128 198.200.100.160 198.200.100.192 198.200.100.224 4
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Subnetting Examples Number of networks Class C Example #2 : 198.200.100.0 Mask: 255.255.255.0 Required networks: 12 Binary: 0 0 0 0 1 1 0 0 4 bits Required Mask: 11111111.1111111.11111111.11110000 255.255.255.240 Increments Number: 16 (128 64 32 16 8 4 2 1) Networks: 198.200.100.0 198.200.100.16 198.200.100.32 198.200.100.48. 198.200.100.208 198.200.100.224 198.200.100.240 5
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Subnetting Examples Number of networks Class C Example #3 : 198.200.100.0 Mask: 255.255.255.0 Required networks: 60 Binary: 0 0 1 1 1 1 1 0 6 bits Required Mask: 11111111.1111111.11111111.11111100 255.255.255.252 Increments Number: 4 (128 64 32 16 8 4 2 1) Networks: 198.200.100.0 198.200.100.4 198.200.100.8 198.200.100.12. 198.200.100.244 198.200.100.248 198.200.100.252 6
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Subnetting Examples Number of networks Class B Example #1 : 180.64.0.0 Mask: 255.255.0.0 Required networks: 30 Binary: 0 0 0 1 1 1 1 0 5 bits Required Mask: 11111111.1111111.11111000.00000000 255.255.248.0 Increments Number: 8 (128 64 32 16 8 4 2 1) Networks: 180.64.0.0 180.64.8.0 180.64.16.0 180.64.24.0. 180.64.232.0 180.64.240.0 180.64.248.0 7
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Subnetting Examples Number of networks Class B Example #2 : 180.64.0.0 Mask: 255.255.0.0 Required networks: 100 Binary: 0 1 1 0 0 1 0 0 7 bits Required Mask: 11111111.1111111.11111110.00000000 255.255.254.0 Increments Number: 2 (128 64 32 16 8 4 2 1) Networks: 180.64.0.0 180.64.2.0 180.64.4.0 180.64.6.0. 180.64.250.0 180.64.252.0 180.64.254.0 8
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Subnetting Examples Number of networks Class B Example #3 : 180.64.0.0 Mask: 255.255.0.0 Required networks: 280 Binary: 1 0 0 1 0 1 1 0 0 9 bits Required Mask: 11111111.1111111.11111111.10000000 255.255.255.128 Increments Number: 128 (128 64 32 16 8 4 2 1) Networks: 180.64.0.0 180.64.0.128 180.64.1.0 180.64.1.128 180.64.2.0 180.64.2.128. 180.64.254.0 180.64.254.128 180.64.255.0 180.64.255.128 9
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Subnetting Examples Number of networks Class A Example #1 : 60.0.0.0 Mask: 255.0.0.0 Required networks: 500 Binary: 1 0 0 1 0 1 1 0 0 9 bits Required Mask: 11111111.1111111.10000000.00000000 255.255.128.0 Increments Number: 128 (128 64 32 16 8 4 2 1) Networks: 60.0.0.0 60.0.128.0 60.1.0.0 60.1.128.0 60.2.0.0 60.2.128.0. 60.254.0.0 60.254.128.0 60.255.0.0 60.255.128.0 10
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Subnetting Examples Number of networks Class A Example #1 : 60.0.0.0 Mask: 255.0.0.0 Required networks: 1000 Binary: 1 1 1 1 1 0 1 0 0 0 10 bits Required Mask: 11111111.1111111.11000000.00000000 255.255.192.0 Increments Number: 64 (128 64 32 16 8 4 2 1) Networks: 60.0.0.0 60.0.64.0 60.0.128.0 60.0.192.0 60.1.0.0 60.1.64.0 60.1.128.0 60.1.192.0. 60.255.0.0 60.255.64.0 60.255.128.0 60.255.192.0 11
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Calculate Hosts 12
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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
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Subnetting Examples Number of Hosts Class C Example #1: 198.200.100.0 Mask: 255.255.255.0 Required hosts: 50 Binary: 0 0 1 1 0 0 1 0 6 bits Required Mask: 11111111.1111111.11111111.11000000 255.255.255.192 Increments Number: 64 (128 64 32 16 8 4 2 1) Networks: 198.200.100.0 (198.200.100.1 – 198.200.100.62) 198.200.100.64 (198.200.100.65 – 198.200.100.126) 198.200.100.128 (198.200.100.129 – 198.200.100.190) 198.200.100.192 (198.200.100.193 – 198.200.100-254) 14
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Subnetting Examples Number of Hosts Class C Example #1: 198.200.100.0 Mask: 255.255.255.0 Required hosts: 100 Binary: 0 1 1 0 0 1 0 0 7 bits Required Mask: 11111111.1111111.11111111.10000000 255.255.255.128 Increments Number: 128 (128 64 32 16 8 4 2 1) Networks: 198.200.100.0 (198.200.100.1 – 198.200.100.126) 198.200.100.128 (198.200.100.129 – 198.200.100.254) 15
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Subnetting Examples Number of Hosts Class B Example #1: 180.200.0.0 Mask: 255.255.0.0 Required hosts: 100 Binary: 0 1 1 0 0 1 0 0 7 bits Required Mask: 11111111.1111111.11111111.10000000 255.255.255.128 Increments Number: 128 (128 64 32 16 8 4 2 1) Networks: 180.200.0.0 (198.200.0.1 – 198.200.0.126) 180.200.0.128 (198.200.0.129 – 198.200.0.254) 180.200.1.0 (198.200.1.1 – 198.200.1.126) 180.200.1.128 (198.200.1.129 – 198.200.1.254). 180.200.253.0 (198.200.253.1 – 198.200.253.126) 180.200.253.128 (198.200.253.129 – 198.200.253.254) 16
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Subnetting Examples Number of Hosts Class B Example #2: 180.200.0.0 Mask: 255.255.0.0 Required hosts: 300 Binary: 1 0 0 1 0 1 1 0 0 9 bits Required Mask: 11111111.1111111.11111110.00000000 255.255.254.0 Increments Number: 2 (128 64 32 16 8 4 2 1) Networks: 180.200.0.0 (180.200.0.1 – 180.200.1.254) 180.200.2.128 (180.200.0.129 – 180.200.0.254) 180.200.4.0 (180.200.1.1 – 180.200.1.126). 180.200.253.0 (180.200.253.1 – 180.200.253.126) 180.200.253.128 (180.200.253.129 – 180.200.253.254) 17
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Subnetting Examples Number of Hosts Class B Example #2: 180.200.0.0 Mask: 255.255.0.0 Required hosts: 1500 Binary: 1 0 1 1 1 0 1 1 1 0 0 11 bits Required Mask: 11111111.1111111.11111000.00000000 255.255.248.0 Increments Number: 8 (128 64 32 16 8 4 2 1) Networks: 180.200.0.0 (180.200.0.1 – 180.200.7.254) 180.200.8.128 (180.200.8.1 – 180.200.15.254) 180.200.16.0 (198.200.16.1 – 198.200.23.254). 180.200.240.0 (180.200.240.1 – 180.200.247.254) 180.200.248.0 (180.200.248.1 – 180.200.255.254) 18
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Reverse Calculations! 19
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Subnetting Examples Finding the network of a given IP Address and Mask: 192.168.30.179/28 179 = 10110011 4bit = 11110000 And Result = 10110000 = 176 192.168.30.176/28 192.168.30.115/29 115 = 01110011 5bit = 11111000 And Result = 01110000 = 112 192.168.30.112/29 20
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