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Subnetting Convertir en PDF Version imprimable Suggérer par mail
Écrit par CCNA   
26-05-2008
  • Subnetting : process of splitting one big network into multiple smaller networks by borrowing bits from the host part to the network part
       --> more networks, less hosts per network
       --> optimization of IP addressing
    IP subnetting
  • Subnetting procedure through the example : 192.168.10.0/26
    • Step 1 : Identify the IP class
         192.168.10.0/26 (classless) --> 192.168.10.0/24 (C- class)
      C class subnetting
    • Step 2 : Expand the host part    
      27 26 25 24 23 22 21 20
      1 1 0 0 0 0 0 0 
               --> 27+26 = 128+64 = 192
    • Step 3 : Determine the number of subnets
         M = nb of bits reserved to the network --> 2M-2 = 22-2 = 2 subnets available
    • Step 4 : Determine the number of hosts per subnet
         N = nb of bits reserved to hosts --> 2N-2 = 26-2 = 64-2 = 62 hosts per subnet
    • Step 5 : Calculate the block size
         Block size = 256-nb of bits reserved to the network --> Block size = 256-192 = 64
    • Step 6 : Determine the subnet mask
         Subnet mask --> networkpart = all bits at 1 / host part = all bits at 0 --> Subnet mask = 255.255.255.192
    • Step 7 : List the subnets and their characteristics
         1st subnet = use the block size
         2nd subnet = use the block size x 2
         ( ... )
         Last subnet = Subnet mask - Block size    
      N° NetID IP range Broadcast
      1 192.168.10.64 65-->126 192.168.10.127
      2 192.168.10.128 129-->190 192.168.10.191
Dernière mise à jour : ( 02-06-2008 )
 
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