Which features constitute a secure API gateway design for CDX?

Which features constitute a secure API gateway design for CDX?

• A. TLS termination is not necessary if the API gateway is trusted.
• B. Use client-side authentication only.
• C. Central authentication/authorization, TLS termination, rate limiting, input validation, logging and policy enforcement with threat protection.
• D. Rely solely on endpoint IP allow list without further protections.

Answer: (C)

A secure API gateway design integrates centralized controls and layered protections at the entry point to your services. Central authentication and authorization ensure every request is evaluated against a single, unified policy, so access decisions aren’t left to individual services or clients. TLS termination at the gateway is crucial because it allows the gateway to inspect traffic, apply encryption controls consistently, and enforce security policies before requests reach backend services. It also enables efficient handling of cryptographic operations and the option to re-encrypt traffic to back-end services if needed. Rate limiting is essential to prevent abuse and protect downstream systems from bursts or attacks. Input validation blocks malformed or dangerous payloads early, reducing the risk of injection flaws and other runtime errors. Logging provides visibility and traceability, while policy enforcement with threat protection delivers ongoing defense against evolving threats, including automated bots and common attack patterns. Relying solely on a trusted gateway to avoid TLS termination misses out on the ability to enforce policies, inspect traffic, and monitor activity. Using client-side authentication alone shifts risk to the client and doesn’t guarantee centralized enforcement or protection of the broader API ecosystem. Relying only on an endpoint IP allow list ignores application-layer security, is easy to bypass, and offers little protection against malformed requests or sophisticated attacks. The comprehensive combination of centralized controls, encryption management, rate limiting, input validation, logging, and threat-aware policy enforcement provides a robust, scalable defense for a CDX API gateway.

A secure API gateway design integrates centralized controls and layered protections at the entry point to your services. Central authentication and authorization ensure every request is evaluated against a single, unified policy, so access decisions aren’t left to individual services or clients. TLS termination at the gateway is crucial because it allows the gateway to inspect traffic, apply encryption controls consistently, and enforce security policies before requests reach backend services. It also enables efficient handling of cryptographic operations and the option to re-encrypt traffic to back-end services if needed.

Rate limiting is essential to prevent abuse and protect downstream systems from bursts or attacks. Input validation blocks malformed or dangerous payloads early, reducing the risk of injection flaws and other runtime errors. Logging provides visibility and traceability, while policy enforcement with threat protection delivers ongoing defense against evolving threats, including automated bots and common attack patterns.

Relying solely on a trusted gateway to avoid TLS termination misses out on the ability to enforce policies, inspect traffic, and monitor activity. Using client-side authentication alone shifts risk to the client and doesn’t guarantee centralized enforcement or protection of the broader API ecosystem. Relying only on an endpoint IP allow list ignores application-layer security, is easy to bypass, and offers little protection against malformed requests or sophisticated attacks. The comprehensive combination of centralized controls, encryption management, rate limiting, input validation, logging, and threat-aware policy enforcement provides a robust, scalable defense for a CDX API gateway.