Which non-standard port is commonly used for HTTP proxy or application servers?

• A. 3128 TCP
• B. 8080 TCP
• C. 80 TCP
• D. 8000 TCP

Answer: (B)

8080 is commonly used as the go‑to non-standard HTTP port because it’s easy to remember, sits above the privileged range (so it can be run without special permissions), and many HTTP proxy and application server packages default to or document it as a convenient alternative to port 80. This widespread convention makes 8080 a familiar choice for services that handle HTTP traffic when port 80 isn’t available or desirable.

While other ports like 3128 are indeed used by some proxy setups (notably certain proxy servers), they’re less universal across different software. Port 80 is the standard HTTP port, so it isn’t non-standard, and 8000 is often used for development rather than as a broadly adopted default for production-style HTTP proxies or apps.