Follow-up · depth 5
How would you debug production issues related to L4 vs L7 Load Balancing?
How would you debug production issues related to L4 vs L7 Load Balancing?
Answers use simple, clear English.
Audio N/AQuick interview answer
Debug L4 vs L7 Load Balancing by confirming blast radius, checking lag/error metrics, grabbing profiles/traces, then mitigating before deep root-cause. Use L4 vs L7 Load Balancing as the core idea. Example shape: ALB routes /api → API target group, /static → S3; NLB for gRPC TCP passthrough..
Detailed answer
Production debug playbook for L4 vs L7 Load Balancing: 1) Stabilize: rate-limit, shed load, or roll back if users are hurting. 2) Orient: dashboards for latency, errors, saturation tied to L4 vs L7 Load Balancing. 3) Evidence: traces, profiles, logs with correlation IDs. 4) Hypothesize + prove with a safe experiment. 5) Fix + add a regression test/alert so it cannot silently return. Watch for: L7 LB without health checks; single LB bottleneck. Parent context: Use L4 vs L7 Load Balancing as the core idea. Example shape: ALB routes /api → API target group, /static → S3; NLB for gRPC TCP passthrough..
Full explanation
Interviewers score structured incident thinking: mitigate → measure → root cause → prevent. L4 (TCP) routes by IP/port fast. L7 (HTTP) routes by path/header/cookie — enables sticky sessions, TLS, WAF integration.
Follow-up questions
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Parent context — L4 vs L7 Load Balancing
Use L4 vs L7 Load Balancing as the core idea. Example shape: ALB routes /api → API target group, /static → S3; NLB for gRPC TCP passthrough..
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