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Interview question · Network Security & Protocols

How would you secure remote access: a traditional VPN or zero-trust network access? What attacks target each?

A VPN answers 'are you allowed on the network?'. Zero-trust access asks 'may this user, on this device, reach this application right now?'. The interview tests whether you can explain why the second question is safer.

mediumNewPreparation tags: Google, Microsoft, CiscoUpdated Nov 2026

A VPN answers 'are you allowed on the network?'. Zero-trust access asks 'may this user, on this device, reach this application right now?'. The interview tests whether you can explain why the second question is safer.

Make your first attempt

What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A company debates replacing its VPN with zero-trust network access after a critical vulnerability in its VPN appliance.

  1. What does a traditional VPN do?
  2. Why are VPN appliances a target?
  3. How does ZTNA differ?
  4. What about apps ZTNA cannot front?
  5. How would you migrate?
  6. What would you recommend?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
Next in this trackHow do SPF, DKIM and DMARC work together to stop email spoofing, and what do they not stop?Next in this trackHow do WPA2, WPA3 and enterprise Wi-Fi authentication work, and what attacks remain on wireless networks?Next in this trackWalk through denial-of-service attacks by layer, from volumetric floods to application abuse, and the defence for each.
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