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Simplified Supernetting

Simplified Supernetting - Simplified Supernetting An easier...

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Simplified Supernetting An easier way to learn how to supernet is to create a table as follows: # of Bits (b) X=8-b # of Networks (2 x ) 1 7 128 2 6 64 3 5 32 4 4 16 5 3 8 6 2 4 7 1 2 Use the above table to you find the number in column 3 that is equal to, or just greater than, the number of networks you’re needing to combine. (Keep in mind, though, if you use the next largest increment, you could run into problems if your organization doesn’t own all the addresses in that range) Notice that the number of Networks is equal to 2 8-b where b is the number of bits used for supernetting. Example 1 For example, suppose you want to supernet the 16 Class C networks 201.168.0.0 through 201.168.15.0 into a single Supernetted Address Range. You would find the number 16 in the column labeled # of Networks and discover you need to supernet on 4 bits. This really means borrowing 2 bits from the bits normally reserved for the network portion of the address. Since 201.168.0.0 is a Class C address with a Standard Subnet Mask of 255.255.255.0 we know we will be modifying the 3 rd octet (the last range normally reserved for network addresses) and using the first 4 bits for our network mask.

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