Discussion
Which of the following is an example of a standard IP access list?
Answer: B
Correct answer: access-list 1 deny 172.16.10.1 0.0.0.0
A standard IP access list is numbered 1 to 99, matches on the source address only, and uses a wildcard mask. This entry satisfies all three, and 0.0.0.0 as a wildcard means every bit must match - equivalent to writing host 172.16.10.1. The 110 example is an extended list, and the option with 255.255.0.0 uses a subnet mask where a wildcard is required.
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