A packet filtering firewall looks at the data packet to get information about the source and
destination addresses of an incoming packet, the session’s communications protocol (TCP, UDP or
ICMP), and the source destination application port for the?

A.
Desired service

B.
Dedicated service

C.
Delayed service

D.
Distributed service.

Explanation:
This is true, the packets filters show the desired service port (Remember that they are layer 3
devices), this is because you can have many different referenced port number in the destination port

field of the different packets. You have to look for the well-known port numbers of the service
desired. For example, look in port 80 for HTTP and port 21 for FTP. This is the correct terminology,
see the features of Packet Filters in your CISSP documentation.