| 3.5 |  | Task 3: Port to Application Mapping (PAM) |
| 3.5.2 |  | System-defined port mapping |

| PAM creates a table, or database, of system-defined mapping entries using the well-known or registered port mapping information set up during the system startup. The system-defined entries comprise all the services supported by CBAC, which requires the system-defined mapping information to function properly.

The system-defined mapping information cannot be deleted or changed. Therefore, it is impossible to map HTTP services to port 21, the system-defined port for FTP, or FTP services to port 80, the system-defined port for HTTP.

Figure illustrates the default system-defined services and applications found in the PAM table.