Evolution of Networking: ARPANET to Internet | Class 12th Computer Science | CBSE 2026

Welcome to Lecture 2 of the Class 12th Computer Science Quick Revision Course (CBSE 2026)! 🌐 In this video, we cover the Evolution of Networking, a topic that forms the foundation of Computer Network unit. We trace the complete timeline from the first experimental network (ARPANET) to the modern wireless Internet we use today. 🎯 Goal: To memorize the key dates and full forms for 1-Mark MCQs and understand the role of key milestones in the history of the Internet. In this video, we cover: ✅ The Beginning (1969): How ARPANET connected the first 4 computers (UCLA, SRI, etc.). ✅ The Backbone (1986): The role of NSFNET in expanding connectivity. ✅ The Internet: How TCP/IP standardized communication. ✅ Key Milestones: Email (1971), DNS (1983), and WWW (1990). ✅ Important PYQs: Full forms and "Who invented what?" questions. 📚 Quick Revision Notes (Timeline): 1969: ARPANET established (First Network). 1971: First Email sent by Ray Tomlinson (@ symbol chosen). 1982: TCP/IP introduced as the standard protocol. 1986: NSFNET created (High-capacity backbone). 1990: WWW invented by Tim Berners-Lee. 1997: Wi-Fi (802.11) standard introduced. 📚 About this Course: This "Quick Revision Series" is designed for CBSE Class 12 Computer Science students who want to cover the entire syllabus efficiently. We focus on: • Concept Clarity in minutes. • Previous Year Questions (PYQs) integration. • Exam-oriented tips and tricks. 🎓 Don't miss a single topic! Access the full ALL-IN-ONE course here: 👉    • CBSE 2026 Quick Revision Series   🔔 Next Video: We continue with the next topic: Data Communication Terminologies. 👉 Watch here:    • Video   Make sure to subscribe and hit the bell icon so you don't miss a lecture! ⏱️ Timestamps: 00:00 - Topic introduction and content overview 00:35 - Introduction to Computer Network 01:23 - Need of networking 02:22 - Timeline of Network Evolution 05:28 - Recap of importat milestones (ARPANET, NSFNET and Internet) 06:43 - PYQs on evolution of Networking 07:23 - Summary and end notes #EvolutionOfNetworking #arpanet #class12computerscience #cbse2026 #computernetworks #quickrevision #NSFNET #internethistory #class12cs