OSI Model and TCP/IP — Study Resources & PYQs

Curated resources, past papers and PYQs for OSI Model and TCP/IP.

Study resources

OSI Model Explained (Article) — Cloudflare's widely-cited, clear explanation of the seven OSI layers.
System Design for Beginners Course (Video) — A detailed, well-regarded introduction to system design covering the core building blocks used throughout this roadmap.
Networking Fundamentals for Cybersecurity (Video) — NetworkChuck's practical introduction to networking concepts security professionals need.