An access list control(ACL) is a list of permission attached to a computer file and also controls traffic into and out of your network. ACL specifies which users or systems processors are granted access to computer files, as well as what operations are allowed on given computer files. Each entry in a typical ACL specifies a subject and an operand(quantity on which an operation is performed). For example, if a file has an ACL that contains ( Hafiz, Read), means Hafiz is given the permission of reading the file.
Inbound ACLs:
Incoming packets are processed
before they are routed to an outbound interface. An inbound ACL is
efficient because it saves the overhead of routing lookups if the packet
will be discarded after it is denied by the filtering tests. If the
packet is permitted by the tests, it is processed for routing.
Outbound ACLs:
Incoming packets are routed to the outbound interface and then processed through the outbound ACL.
References
http://en.wikipedia.org/wiki/Access_control_list
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