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DataStructures / Cyber Security Interview Questions

How does Zero Trust Architecture change traditional network security?

Traditional network security assumes that anything inside the corporate perimeter, behind the firewall, is trusted by default. Zero Trust discards that assumption entirely: no user, device, or request is trusted just because it's on the internal network.

flowchart LR A[Traditional Model] --> B[Trust anything inside the perimeter] C[Zero Trust Model] --> D[Verify every request individually] D --> E[Micro-segmented resources] B --> F[Single perimeter firewall]
  • Every request is authenticated and authorized individually, regardless of where it originates
  • Access is granted per-session and per-resource, not network-wide
  • Micro-segmentation limits how far an attacker can move even after breaching one system
  • Continuous verification replaces a one-time login check

This matters most with cloud adoption and remote work, since there's no longer a clean network perimeter to defend; users and services now connect from everywhere.

What does Zero Trust assume about internal network traffic?
What limits attacker movement after one system is breached in a Zero Trust model?

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