Load Balancing

We introduced load balancers briefly in Networking Essentials. This lesson goes deeper. It covers the algorithms, placement patterns, and operational details that come up when interviewers probe your high-level design.

Every non-trivial system design includes a load balancer. The question isn't whether to add one. It's how to use it effectively, and what to say when the interviewer asks "what happens when one of those servers goes down?"