Tools / Zero Trust Architecture (ZTA) Interview questions
Why doesn't Zero Trust eliminate the need for perimeter defenses entirely?
Perimeter controls, firewalls, network filtering, and DDoS protection, still serve a purpose: they reduce noise and stop large volumes of unauthenticated, opportunistic traffic before it ever reaches the more expensive, fine-grained identity and policy checks that Zero Trust relies on.
Zero Trust is a defense-in-depth addition on top of the perimeter, not a wholesale replacement for it. Removing perimeter filtering entirely would mean every single packet, including obvious scanning and flooding traffic, has to be evaluated by the policy engine, which is both wasteful and unnecessary.
The practical model pairs coarse, cheap perimeter filtering with the fine-grained, identity-aware verification Zero Trust adds, each layer catching what the other is poorly suited to handle.
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