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what is difference between subnet-mask and wildcard mask?
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Answer Posted / sarbjeet sohi
Subnet-mask is used to match contigous bits, means in subnet mask there is no 1 after 0. Its always from high (1's) to low (0's).
EXAMPLE:- subnetmask-----255.255.0.0
BInary----- 11111111.11111111.00000000.00000000
In above example there is continous 1's and continous 0's
It cannot be like this :-
11111111.00000000.11111111.00000000 = 255.0.255.0
Because subnet mask is used only for the classful and when CIDR comes WILDCARD mask is launched. The above bit pattern in WCM tells to match 2nd and 4th octect.1st and 3rd can be ignored.
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