JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2021) — Question 9

Which statement defines the function of an Application Layer Gateway (ALG)?

Answer options

• A. The ALG uses software processes for permitting or disallowing specific IP address ranges.
• B. The ALG uses software that is used by a single TCP session using the same port numbers as the application.
• C. The ALG contains protocols that use one application session for each TCP session.
• D. The ALG uses software processes for managing specific protocols.

Correct answer: D

Explanation

The correct answer, D, accurately describes the ALG's primary function of managing specific protocols. Option A incorrectly focuses on IP address management rather than protocol oversight. Option B misrepresents the ALG's operation by suggesting it operates only within a single TCP session. Option C also fails to capture the essential role of the ALG by implying a limitation on application sessions.