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Access lists applied to interfaces default to outbound if no direction is specified.

-1 is used with IPX access lists to specify wildcard networks.

Limiting broadcast traffic is important because a broadcast frame is more likely to cause a collision than a unicast frame.

There are two types of access lists

Standard access lists; standard IP access lists check the source address of packets. The result permits or denies the packet output for the ENTIRE PROTOCOL SUITE based on the only source address. Standard access lists do not specify destination addresses. Standard access list have a number from 1 to 99. IPX standard access lists are numbered from 800 to 899.

Extended access lists; extended IP access lists check for both source and destination packet addresses. They can also check for SPECIFIC PROTOCOLS, port numbers, and other parameters, which give administrators more flexibility and control. Extended access lists have a number from 100 to 199. IPX extended access lists are numbered from 900 to 999.

Access List Testing Process:

1. Access list statements operate in a sequential, logical order. They evaluate packets from the top down, one statement at a time. Placing more frequent access list statements at the top will reduce CPU overhead for the router.

2. If a packet header and an access list statement match, the rest of the statements are skipped, and the packet is either permitted or denied.

3. If a packet header does not match an access list, it is tested against the next statement in the list until the end of the list is reached, at which time the packet is denied by an implicit deny.