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Interview question · Systems, OS & Memory Safety

How does application allowlisting work on Windows, macOS and Linux, and why do attackers still run code on allowlisted machines?

Default-deny execution is one of the strongest endpoint controls there is, and one of the least deployed. The scored answer explains the rule types, the bypass classes and how to roll it out without a revolt.

hardNewPreparation tags: Microsoft, Apple, CrowdStrikeUpdated Nov 2026

Default-deny execution is one of the strongest endpoint controls there is, and one of the least deployed. The scored answer explains the rule types, the bypass classes and how to roll it out without a revolt.

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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 company enforces AppLocker with default path rules allowing anything under Program Files and Windows. Incident responders find attacker tooling ran on several laptops anyway.

  1. How could tooling run under these rules?
  2. What policy would you move to?
  3. How do you stop the policy from being abandoned after complaints?
  4. How do you summarise application allowlisting?

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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