Which option describes the role of a proxy in web security testing?

• A. It modifies DNS records only.
• B. It forwards traffic and allows inspection and modification.
• C. It blocks all incoming traffic unconditionally.
• D. It only logs traffic without modification.

Answer: (B)

A proxy in web security testing acts as an intermediary that forwards traffic between your testing tool and the target, while giving you visibility into and control over that traffic. It intercepts requests and responses so you can inspect headers, parameters, cookies, and payloads, and you can modify them to test how the application handles unusual inputs, authentication flows, and error conditions. This interception capability is what lets you perform controlled Man-in-the-Middle tests and verify how the application reacts to manipulated data, security controls, and input validation. It’s not simply about changing DNS records, it doesn’t inherently block all traffic, and it’s more than just logging—it's a flexible tool for observing and altering traffic in real time.