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Interview question · Network Security & Protocols

DMARC is at reject, yet phishing still arrives. How do email gateways and API-based filters stop what sender authentication cannot?

Sender authentication proves which domain sent a message, not that the message is safe. The scored answer walks the layers after it and where each one is blind.

mediumNewPreparation tags: Microsoft, Google, CiscoUpdated Nov 2026

Sender authentication proves which domain sent a message, not that the message is safe. The scored answer walks the layers after it and where each one is blind.

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 finance employee receives a well-written email from a known supplier's real address, passing SPF, DKIM and DMARC, asking to update the bank account for next month's invoices. The supplier's mailbox was compromised.

  1. Which email controls could flag this message?
  2. What process control matters most?
  3. The employee also clicked a link in a follow-up message from the same mailbox. What now?
  4. How do you describe email security in layers?

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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