A load balancer distributes incoming requests across multiple servers. If one server dies, traffic goes to others. This gives you horizontal scaling (add more servers = handle more traffic) and high availability.

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High-Level Design0/247

OSI Model

IP Address

Domain Name System (DNS)

Proxy vs Reverse Proxy

HTTP/HTTPS

TCP vs UDP

Load Balancers

Load Balancing Algorithms

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easyPhase 2 · How the Internet Works 5 min read

Load Balancers

Interactive — Try it yourself!

How to use

1Click "Send Request" — watch it route to a server

2Switch algorithm: Round Robin → Least Connections → Random

3Click "Kill" on a server — see traffic reroute to healthy ones

4Turn on "Auto" for continuous traffic flow

In a nutshell

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