Wildcard for the USG2000&5000

The wildcard is the reverse bits of the obverse mask. For example, mask 255.255.255.0 of network C is expressed as 1111111111111111 11111111 00000000 in binary format. Conversely, the binary format is displayed as 00000000 00000000 00000000 11111111. Accordingly, the wildcard in decimal format is 0.0.0.255. In an ACL, the wildcard is adopted for matching IP addresses, whereas the obverse mask is adopted for matching MAC addresses.

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