Q: What is an API Gateway, and how does it differ from a standard Load Balancer?
A standard Load Balancer (like a Network Load Balancer) primarily operates at Layer 4, simply forwarding raw TCP packets to backend IPs.
#General DevOps #General DevOps — Scenario-Based Interview Questions #L1 #DevOps #SRE #Architecture
🎙️ Candidate Opening & Architectural Context
""When an interviewer asks about this scenario, I explain how we balanced incident response with long-term prevention. The interviewer is testing: OSI Layer 7 routing, API management, authentication offloading.. I structure my answer around systematic triage first, root cause analysis second, and permanent remediation third.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Production Solution & Architecture
A standard Load Balancer (like a Network Load Balancer) primarily operates at Layer 4, simply forwarding raw TCP packets to backend IPs. An API Gateway operates at Layer 7 and is specifically designed to manage API logic. While it performs load balancing, its primary job is routing HTTP requests based on URL paths (/users goes to Service A, /billing to Service B), handling rate limiting, request validation, payload transformation, and acting as a centralized authentication layer (e.g., verifying JWT tokens) before traffic ever reaches the backend microservices.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: A standard Load Balancer (like a Network Load Balancer) primarily operates at Layer 4, simply forwarding raw TCP packets to backen."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: A standard Load Balancer (like a Network Load Balancer) primarily operates at Layer 4, simply f
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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