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Another subject that seems to vex a lot of new CCNA students and
others ( I
know it did me), is finding wildcard masks.
A wildcard mask is the inverse (or reverse - whatever-) of the
subnet mask. Example:
OK. So how did we come up with that? You can do it two different ways:
1. Take 255.255.255.255 and subtract
2. Convert everything to binary 11111111.11111111.11111111.11000000
I hope this information will be of use to someone.