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Standard IP Access Lists
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A Standard Access List only allows you to permit or deny traffic from specific IP addresses. The destination of the packet and the ports involved do not matter.

Here is an example:

access-list 10 permit 192.168.3.0 0.0.0.255

This list allows traffic from all addresses in the range 192.168.3.0 to 192.168.3.255

You can see how the last entry looks similar to a subnet mask, but with Cisco ACLs they use inverse subnet masks. Also realize that by default, there is an implicit deny added to every access list. If you entered the command:

show access-list 10

The output would be:

Access-list 10 permit 192.168.3.0 0.0.0.255 access-list 10 deny any