Which is the MAIN advantage of having an application gateway?

A.
To perform change control procedures for applications.

B.
To provide a means for applications to move into production.

C.
To log and control incoming and outgoing traffic.

D.
To audit and approve changes to applications.

Explanation:
“An application-level gateway firewall is also called a proxy firewall. A proxy is a
mechanism that copies packets from one network into another; the copy process also changes the
source and destination address to protect the identity of the internal or private network. An
application-level gateway firewall filters traffic based on the Internet service (i.e., application) used
to transmit or receive the data.” – Shon Harris All-in-one CISSP Certification Guide pg 92