Today, application proxy firewalls are commonly used ________.

• A. to protect internal clients from malicious external servers
• B. as main border firewalls
• C. Both A and B
• D. Neither A nor B

Answer: (A)

Application proxy firewalls sit between internal clients and external servers and evaluate traffic at the application layer. By terminating the application protocol and inspecting the actual content of requests and responses, they can enforce detailed policies, authentication, and content filtering before anything reaches internal systems. This deep level of inspection helps block exploits, malware, and other harmful activity carried by external servers, effectively shielding internal clients from threats that travel over application-layer protocols. While they can be placed at the network edge, their strength lies in safeguarding internal systems through application-level controls rather than serving as the primary perimeter device, which is why they’re best described as protecting internal clients from malicious external servers rather than as the main border firewall.