What is the role of the application server in the recommended architecture?

• A. To operate on the internal network and process application logic
• B. To face the Internet and handle incoming web requests
• C. To store and manage data
• D. To route traffic between networks

Answer: (A)

In a typical multi-tier setup, the application server is the layer that runs the business logic on the internal network. It takes input from the web front end (or API gateway), processes that input according to the application's rules, coordinates workflows, and talks to the database and other services to produce the needed results. It stays behind the firewall and isn’t exposed directly to the Internet; external requests are handled by the web server or gateway first, which then passes them to the application server.

This role differs from the tasks of other components: the web server (or gateway) faces the Internet and handles incoming web requests, the database server stores and manages data, and routers/firewalls route or control traffic between networks. Therefore, the application server’s primary function is to operate on the internal network and execute the application’s logic.