Tools / Zero Trust Architecture (ZTA) Interview questions
Why should you separate the control plane from the data plane in ZTA?
The control plane, holding the policy engine and policy administrator, makes decisions and stores sensitive policy logic and credentials. The data plane, the proxies and gateways that actually forward traffic, only executes decisions it has already been given.
Separating them limits blast radius: if an attacker compromises a data-plane proxy, they gain the ability to disrupt or observe the traffic passing through that one component, but they gain no authority to mint new access or change policy elsewhere, since that logic never lived there in the first place.
This separation also allows each plane to be hardened and scaled independently; the control plane, being a smaller, higher-value target, can receive tighter access controls and monitoring than the many distributed data-plane enforcement points.
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