Backward compatibility testing in the EPD Pilot aims to prevent what risk?

• A. Operational disruptions when newer versions interact with older peers
• B. Improved performance due to newer features
• C. Unintended incompatibilities between new versions and older peers
• D. Eliminates the need for version negotiation

Answer: (C)

Backward compatibility testing focuses on ensuring that newer versions can still interoperate with older peers without surprising behavior. The risk it targets is unintended incompatibilities that arise when interfaces, data formats, or expected protocol sequences change in ways older peers can’t handle. By validating interactions across version combinations, you catch mismatches in message structures, feature support, or timing that could lead to misinterpretation of data, failed negotiations, or broken communications. The goal is to prevent outages or degraded operation after an upgrade, not to boost performance from new features, and not to assume version negotiation is unnecessary. While disruptions can happen if changes aren’t compatible, the test’s central aim is to detect and prevent those unintended mismatches between new and older versions.