Abbreviated as PAM, Port to Application Mapping is a feature of the Cisco IOS Firewall that allows you to customize TCP or UDP port numbers for network services or applications. Using the port information, PAM establishes a table of default port-to-application mapping information at the firewall. PAM also supports host or subnet specific port mapping, which allows you to apply PAM to a single host or subnet using standard access control lists (ACLs).
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