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Interview question · Security Foundations & Threat Modeling

How do real intrusions unfold from first access to impact, and where should a defender spend effort to stay ahead of attackers?

Attackers are not wizards; they repeat a small number of moves because those moves keep working. The answer names the moves and the choke points where one control breaks many intrusions.

mediumEssentialNewPreparation tags: CrowdStrike, Google, MicrosoftUpdated Nov 2026

Attackers are not wizards; they repeat a small number of moves because those moves keep working. The answer names the moves and the choke points where one control breaks many intrusions.

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 5 follow-ups like an interviewer would

A mid-size company asks you to explain how a typical ransomware intrusion would reach them and where they should invest first. They have a VPN appliance, SMS-based MFA, a shared local admin password on workstations and backups on a network share.

  1. How would an attacker most likely get in?
  2. What does the shared local admin password give them?
  3. Why do the backups matter to the attacker?
  4. Where would you detect them before impact?
  5. What is the investment order?

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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