OSI & TCP/IP Models Explained + What Happens When You Type Google.com? (Networking Masterclass)

Master the fundamentals of computer networking in this comprehensive tutorial! Whether you are preparing for a DevOps interview, sharpening your SRE skills, or studying system administration, this video breaks down how data actually travels across the internet. We start with a deep dive into the OSI 7-Layer Model and compare it with the TCP/IP Model. Next, we take a real-world journey behind the scenes to see exactly what happens in the backend when you type google.com into your browser—from DNS resolution and the 3-way handshake to HTTP response rendering. Finally, we wrap up with practical, hands-on networking commands every engineer should know for troubleshooting connectivity. Timestamps / Chapters 00:00 - Introduction to Computer Networking 00:00 - The OSI 7-Layer Model Explained Simply 00:00 - TCP/IP Model vs. OSI Model Breakdown 00:00 - What Happens When You Type google.com in a Browser? (Backend Walkthrough) 00:00 - Essential Networking & Troubleshooting Commands (ping, dig, nslookup, nc) 00:00 - Conclusion & Summary Commands Covered in This Video ping – Check reachability and packet loss dig / nslookup – Query DNS records and troubleshoot name resolution nc / telnet – Test TCP port connectivity