Explain the principle of operation of load balancers in network systems

A load balancer distributes incoming network traffic across multiple servers or resources to ensure even load and increase system fault tolerance.

Working principle:

• When a request arrives, the load balancer selects a server from the pool based on a specific algorithm (e.g., round-robin, least connections, IP-hash).
• The request is forwarded to the selected server.
• The load balancer monitors the status of servers and excludes unavailable ones from the pool.

This allows:

• To increase the system's throughput.
• To ensure uninterrupted operation in case of server failures.
• To optimize resource utilization.

An example of the round-robin algorithm is that requests are sequentially directed in a circular manner to each server.