What is the primary purpose of load balancing in a network?

• A. Increase bandwidth of a single server
• B. Distribute traffic across multiple servers
• C. Encrypt data between clients and servers
• D. Reduce latency by caching content

Answer: (B)

Distributing traffic across multiple servers to share the workload and keep services responsive is the main idea behind load balancing. A load balancer sits in front of several servers and routes incoming requests to one of them based on factors like current load, number of connections, or a simple round-robin scheme. This approach prevents any single server from becoming a bottleneck, improving throughput and handling more simultaneous users.

It also provides fault tolerance: if one server goes down, the load balancer redirects traffic to the remaining healthy servers, keeping the service available. That combination of better performance under load and higher availability is what makes distributing traffic across multiple servers the core purpose of load balancing.

Note what it isn’t doing: increasing the capacity of a single server, encrypting data between clients and servers, or caching content to reduce latency. Those are separate techniques (upgrading hardware, TLS/SSL, and caching/CDN respectively).