Nearly all applications can be proxied effectively.

• A. TRUE
• B. FALSE
• C. Sometimes
• D. Not sure

Answer: (B)

The idea being tested is whether a proxy can effectively handle nearly every application. In practice, proxies work well for many common, TCP-based services like web traffic, email, and some streaming, but a lot of applications don’t fit neatly into proxying or require a direct, end-to-end connection to function properly. For example, UDP-based real-time communications (voice, gaming), peer-to-peer file sharing, and VPNs often don’t proxy well through standard proxies because UDP and dynamic port behavior are hard to manage, and the proxy can add latency or block traffic. Some apps use certificate pinning or end-to-end encryption, which prevents a proxy from inspecting or modifying the data without breaking the application's security guarantees. Others rely on multi-channel protocols or dynamic port negotiation that a typical proxy can’t reliably handle. Because these scenarios show that proxies cannot effectively cover every application, the statement isn’t accurate.