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Year 2 - Chapter 6/Cisco 3 - Module 6 ACLs - page 24 / 40

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Extended ACLs – TCP Relational Operators

The access list TCP protocol option supports both source and destination ports. You can access each by using either the port number or a mnemonic or acronym. Keyword relational operators such as those shown in the following code output precede these:

Lab-X(config)#access-list 101 deny tcp any ?

 A.B.C.D  Destination address.

 any      Any destination host.

 eq       Match only packets on a given port number.

 gt       Match only packets with a greater port number.

 host     A single destination host.

 lt       Match only packets with a lower port number.

 neq      Match only packets not on a given port number.

 range    Match only packets in the range of port numbers.

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