Version 4.1 - 5.2.c Port-to-application mapping
PAM (port-to-application mapping) is a feature of the IOS Firewall feature set. The information in the PAM table enables CBAC supported services to run on nonstandard ports.
Of course, there is Cisco Documentation that outlines PAM.
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 start-up. 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; that is, you cannot map HTTP services to port 21 (FTP) or FTP services to port 80 (HTTP).
That looks like something I would probably use to base a question on PAM. But, the most likely scenario would related to HTTP on a nonstandard port.
access-list 10 permit 192.168.32.43
ip port-map ftp port 8000 list 10
access-list 50 permit 192.168.92.0 0.0.0.255
ip port-map http 8080 list 50
CBAC uses the information in the PAM table to identify a service or application from traffic flowing through the firewall. With PAM, CBAC can associate non-standard port numbers with specific protocols.
For this section, you will want to look at all the use examples. I wouldn't memorize any of them, just get an idea of its use. Know that "ip port-map" should associate with PAM in your head. I would be surprised if there was more than one question on this. Once you understand the concept and its uses, move on.