What is the purpose of a proxy server?

• A. To forward client requests to external servers, provide caching, filtering, and additional privacy or security.
• B. To act as the primary DNS server for the internal network.
• C. To replace the gateway in the network path.
• D. To host all public-facing applications in the DMZ.

Answer: (A)

A proxy server acts as an intermediary between you and the servers you access, forwarding your requests and returning the responses. It can cache commonly requested content to speed things up, reduce bandwidth, and improve responsiveness. It can also filter traffic and enforce security or access rules, and it helps protect privacy by masking internal addresses and providing additional authentication and monitoring. This combination—forwarding requests, caching, filtering, and enhanced privacy/security—is what makes a proxy valuable. A DNS server, by contrast, mainly translates domain names to IP addresses, not the broader request-forwarding and filtering role of a proxy. Replacing the gateway would muddle routing responsibilities at a network level, whereas a proxy operates at the application level to handle specific traffic like web requests. Hosting public-facing apps in a DMZ is a deployment choice for security zoning, not the defining purpose of a proxy.