A second common condition where Cisco
IOS will permit an abbreviation term in the extended access list
wildcard mask is when the administrator wants to match all the bits of
an entire IP host address.
Consider a network administrator who
wants to specify that a specific IP host address will be denied in an
access list test. To indicate a host IP address, the administrator
would enter the full address-for example, 172.30.16.29; then to
indicate that the access list should check all the bits in the
address, the corresponding wildcard mask bits for this address would
be all zeros (that is, 0.0.0.0).
The administrator can use the
abbreviation host to communicate this same test condition to Cisco IOS
access list software. In the example, instead of typing 172.30.16.29
0.0.0.0, the administrator can use the word host in front of the
address. An example of using this abbreviation as an access list test
condition is the string host 172.30.16.29.
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