Thursday, April 17, 2008

Subnet Mask Vs Wildcard Mask

In general we can derive the subnet mask from the networks bits of a class, like for class A, the network bits are eight (8), so we have to on (1) only the first eight bits and off (0) the remaining bits so the subnet mask we will get is 255.0.0.0, because on the eight bits means 255. Likewise for class B, the networks bits are sixteen (16) twenty-four (24) for class C, so the subnet mask will be 255.255.0.0 and 255.255.255.0 consecutively. If we go in detail of subnet mask, the networks bits means that when data comes so it will check the network bits of the data and will then forward that data.
Some people called the wildcard mask the opposite of subnet mask, like
Class C IP address---------------------- 200.100.50.52
Subnet Mask-----------------------------255.255.255.0
Wildcard Mask---------------------------0.0.0.255

But it is not true always like because if we are asked to calculate wildcard mask for range 192.1.1.0 to 192.1.1.15 then it is know that this range belong to Class C and subnet mask for class C is 255.255.255.0 and the opposite is 0.0.0.255 which is not true. The correct wildcard mask can be calculated by the this way, Suppose we are asked to calculate wildcard mask for the range that is 192.1.1.0 to 192.1.1.15, so the procedure to calculate this range is, First open the last byte and then put 0 for all the same columns and put 1 for different column
192.1.1.0000 0000
192.1.1.0000 1111
0 . 0.0 0000 1111-------> 0.0.0.15------> Wildcard Mask

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