Protocol Explorer is a free interactive network simulator that shows how the internet works, packet by packet. Watch HTTP, HTTPS, TCP, TLS, DNS and 35+ other protocols in motion, with every packet decoded byte by byte.
Interactive lessons walk through real protocol behavior, from a DNS lookup to a complete TLS handshake, and animated explanations are available in 8 languages, making it a practical way to learn networking online. Lessons answer common questions such as how protocols work, what happens during a TCP three-way handshake, and how TLS encrypts traffic.
Try it free at Protocol Explorer.
