🌐 Basics of the Internet
Interactive Learning Simulation (Unit 2)
🎬 Main Simulation: How a Website Loads
Step 1: User Input
Waiting to start...
🌐 The World Wide Web & Internet History
1969 - ARPANET
The first connected network by the US military. Sent the first message "LO" (meant to be LOGIN, but crashed!).
1989 - WWW Invented
Tim Berners-Lee created HTML, HTTP, and the first web browser at CERN.
2004 - Web 2.0 & Social Media
The internet became interactive. Facebook, YouTube, and user-generated content exploded.
2007+ - Mobile Era
Smartphones brought the internet to our pockets. 4G/5G made streaming possible.
💻 The Client-Server Model
🖥️ Client
Requests Web Pages
📡 ISP
Internet Service Provider
🖧 Router
Directs Data Traffic
🗄️ Server
Stores & Serves Data
🔍 Domain Name System (DNS) Hierarchy
1. Root Server
Knows where the TLD servers are (.com, .in, .org)
2. TLD Server
Top Level Domain server. Points to the authoritative server.
3. Authoritative
Holds the actual IP address for the specific domain.
📡 TCP/IP Reference Model
4. Application Layer
User interface & applications (HTTP, DNS)
3. Transport Layer
Data segmentation & reliability (TCP, UDP)
2. Internet Layer
Addressing and routing packets (IP)
1. Network Access / Link Layer
Physical hardware delivery (Ethernet, Wi-Fi)
🌍 HTTP Status Codes
🔎 How Search Engines Work
🕷️
1. Crawling
Spiders visit web pages via links.
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2. Indexing
Words are stored in a database.
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3. Ranking
Algorithms sort best results.
🎮 Test Your Knowledge
🧠 Quick Quiz
🧩 Match Protocol to Layer
Drag the blue protocol boxes to the correct empty layer boxes.