Follow-up · depth 1
How would you test L4 vs L7 Load Balancing?
How would you test L4 vs L7 Load Balancing?
Answers use simple, clear English.
Audio N/AQuick interview answer
Test L4 vs L7 Load Balancing with unit checks for the happy path, integration tests for real I/O boundaries, and load/chaos checks so regressions show up before prod. Core idea: Baseline: L4 (TCP) routes by IP/port fast. L7 (HTTP) routes by path/header/cookie — enables sticky sessions, TLS, WAF integration.
Detailed answer
Interview answer for testing L4 vs L7 Load Balancing: 1) Unit: isolate the pure logic behind L4 vs L7 Load Balancing with deterministic fixtures. 2) Integration: exercise real timers/I/O/network boundaries the way production does. 3) Load & soak: prove the event path still meets SLOs under concurrency. 4) Failure injection: break dependencies and assert recovery/backpressure. Best practices to include: Health check app endpoint not TCP only; cross-zone LB. Call out mistakes: L7 LB without health checks; single LB bottleneck. Parent context: Baseline: L4 (TCP) routes by IP/port fast. L7 (HTTP) routes by path/header/cookie — enables sticky sessions, TLS, WAF integration.
Full explanation
Interviewers want a test strategy, not “I would write tests.” Tie each layer back to how L4 vs L7 Load Balancing fails: correctness, latency, and starvation. 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
Baseline: L4 (TCP) routes by IP/port fast. L7 (HTTP) routes by path/header/cookie — enables sticky sessions, TLS, WAF integration.
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