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System Design · Concept

Single Point of Failure

A load balancer distributes client requests across backend resources. Multiple balancers can improve availability, while routing rules can use health, load, cookies, or network and application data.

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  • Reverse proxy
  • Horizontal scaling
  • Layer 4 load balancing
  • Layer 7 load balancing
  • Session persistence
  • Active-passive
  • Active-active

Source: system-design-primer/README.md at master · donnemartin/system-design-primer · GitHub. Checked 2026-11-03.