On-callMediumoc-p035

Subject Incident responseLevel Mid–Senior~20 minCommon in Reliability & on-call interviewsIndustries Technology

Question

Your CDN (or DNS) provider is having a major outage, and large parts of your site are unreachable for many users even though your origin is healthy. What can you do?

What a strong answer looks like

Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.

Learn the concepts

Diagram & narrate the incident

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Run or narrate your approach, then ask the coach.