Wildcard masks are essential to learn because they are used as part of command line configuration in ACLs and some routing protocols. They exist because there has to be a way to tell the router which parts of an IP address or network address you want to match.
The matching is done at the binary level, but you can easily configure wildcard masks using the same notation you use for subnet masks. A binary 1 tells the router to ignore the digit and a 0 means match the digit.
The easy way to perform wildcard masking for the CCNA exam . . .
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