100 SRE Interview Questions & Answers
Every question paired with a complete, real answer — not just a hint — organized into 10 categories so you can study your weak spot first.
What you get
- 100 real interview questions across 10 categories
- A complete, spoken-style model answer for every single one
- A 4-step study loop that builds real recall, not passive familiarity
- Organized so you can target your weakest category first
- How the same questions map to seniority level, from junior to staff/principal
What's inside
- How to Use This Guide
- Linux & Systems Fundamentals
- Networking
- Kubernetes
- Terraform & Infrastructure as Code
- CI/CD
- Observability & Monitoring
- Incident Response & On-Call
- Cloud Platforms (AWS / Azure / GCP)
- Scripting & Automation
- System Design & Behavioral
- How These Questions Map to Seniority Level
A look inside: Networking
Tests whether you can reason about a request's whole journey, not just recite protocol trivia.
Q: How do you debug a 'connection refused' vs. a 'connection timeout' error?
Connection refused means something at the destination actively rejected the connection — usually nothing is listening on that port, or a firewall explicitly rejected it. Connection timeout means no response came back at all — the packet may have been silently dropped by a firewall, or the host is genuinely unreachable. Refused points you to the destination's service config; timeout points you to network path/firewall rules.
100 SRE Interview Questions & Answers: Mastery Edition
Every question, with the answer written out exactly as you'd say it out loud — plus the mental models underneath, and 20 follow-ups interviewers ask next.