Tools / Zero Trust Architecture (ZTA) Interview questions
When should you implement Zero Trust for legacy applications?
Legacy applications that cannot be modified to support modern authentication are still worth bringing under Zero Trust, but the approach differs from a cloud-native app. Rather than rewriting the application, you typically wrap it with an identity-aware proxy or SDP gateway that brokers access in front of it, applying identity verification and posture checks at the network boundary the app sits behind.
Implementation should be prioritized by risk: start with legacy systems that hold sensitive data or have historically been hard to patch, since those carry the most exposure if left on flat, trusted network access.
Where even a proxy in front of the app isn't feasible, network-level microsegmentation around that system, isolating it to the smallest possible set of permitted callers, is the fallback rather than leaving it exposed on a broad internal subnet.
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