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Interview question · Network Security & Protocols

Your network is 'IPv4 only', but every laptop and server has IPv6 enabled. What security gaps does that create, and how do you close them?

Most networks that say they do not run IPv6 run it anyway, unmanaged. The scored answer finds the three places that matters and decides deliberately.

mediumNewPreparation tags: Cisco, Microsoft, CloudflareUpdated Nov 2026

Most networks that say they do not run IPv6 run it anyway, unmanaged. The scored answer finds the three places that matters and decides deliberately.

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 4 follow-ups like an interviewer would

A penetration tester on an office network that the IT team describes as IPv4 only captures Windows authentication from dozens of laptops within an hour, without touching ARP or DHCP.

  1. What did the tester most likely use?
  2. What stops this at the network?
  3. What reduces the damage even if a host does get the position?
  4. How do you summarise IPv6 risk on an IPv4 network?

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.

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