Load Balancing Interview Questions

Load Balancing Interview Questions

Load balancing questions test your understanding of how to distribute traffic across multiple servers effectively.

Expect discussions on algorithms (round-robin, least connections, consistent hashing), health checks, and failover strategies.

Interviewers evaluate whether you understand when and why to use different load balancing approaches.

536Questions
136Companies
Easy 27 • Medium 251 • Hard 258Difficulty mix

Common load balancing interview patterns

  • Round-robin vs least-connections vs consistent hashing
  • Layer 4 (TCP) vs Layer 7 (HTTP) load balancing
  • Health checks and automatic failover
  • Session affinity and sticky sessions
  • Global server load balancing (GSLB) for multi-region
  • Load balancer as a single point of failure and redundancy

Load balancing interview questions

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Common mistakes with load balancing

  • Forgetting that the load balancer itself can be a bottleneck
  • Using sticky sessions when stateless design is possible
  • Not considering health check latency and false positives
  • Ignoring the difference between L4 and L7 load balancing

How load balancing questions are evaluated

Demonstrate understanding of trade-offs between different algorithms.

Explain how the system handles server failures gracefully.

Consider the load balancer in the context of the overall system architecture.

Related system design concepts