Data communication and OSI layer Model

✍️ Introduction: The Internet is the largest and most powerful network in the world. It connects millions of devices globally, enabling communication, data sharing, research, social interaction, and business. But what really is the internet? Let’s break it down in simple terms. --- 🌐 What is the Internet? The Internet is a global network of interconnected computers and servers that communicate using standardized protocols like TCP/IP. It allows users to: Access websites and online services Send emails and messages Stream videos, play games Use cloud storage Access real-time information Example: When you open Google.com, your device connects to Google’s server via the Internet, fetches the page, and displays it in seconds. --- 🎯 Key Features of the Internet: 1. Global Connectivity – Links the world together 2. Decentralized System – No single owner 3. Multimedia Access – Text, video, audio, images 4. Always Growing – Billions of websites 5. Supports Many Services – Web, email, file sh...

  🧠 Goals and Applications of Computer Networks 🎓 Explained with logic, tricks & real-world examples 📘 Introduction – Why Networks? Imagine a classroom where students can’t talk to each other. Or 10 computers in an office, but none of them connected. That’s a disconnected world. Now imagine: One computer has internet Another has a printer Third has your favorite movies Still, you can access all of them from any system. That’s what computer networks make possible. A network is like the nervous system of technology — it connects , shares , and communicates across distances. 🎯 Goals of Computer Networks – What Do They Really Do? ✅ 1. Resource Sharing “Why buy 10 printers when one printer + network = win?” Networks allow multiple users to share: Printers Files Internet connection Applications (like MS Office, Photoshop) ➡️ Cost saved. Efficiency gained. ✅ 2. High Reliability “If one path fails, another opens.” Like Google Maps r...