System Design Crash Course in 4 Hours

How Internet Works? How API Works? What is DNS? What is TCP? What is TLS? HTTP vs HTTPS? What is a Server? IPv4 vs IPv6 address? What is a Firewall, Gateway, Load Balancer? L3 vs L7 Gateway? L4 vs L7 Load Balancer? Timeline (API + Internet Explained) 00:00 Precap 03:30 What is API 04:08 What is Client 04:49 What is Server 08:53 What is Database 10:57 API Request and Response Example 14:36 What is DNS 19:18 Find IP Address of Website 20:45 How DNS Works 33:19 Is There Only One DNS 38:09 How Request Reaches Nearest DNS 39:39 How DNS Chooses Server IP 49:14 Who Provides DNS 56:30 Who Pays for DNS 1:04:54 What is TCP and 3-Way Handshake 1:15:43 New TCP for every Request? 1:23:45 What is TLS and Why TLS Handshake 1:31:42 Check TLS Certificate in Browser 1:39:19 API Request Example 1:41:10 Check API Response in Browser 1:45:18 How API Request Travels Over the Internet 1:53:37 IPv4 vs IPv6 1:57:56 Role of Firewall 2:00:45 Role of Gateway 2:07:54 Role of Load Balancer 2:16:58 Gateway vs Load Balancer 2:27:34 Are Firewall, Gateway, and Load Balancer Servers 2:30:06 Who Provides Firewall, Gateway, and Load Balancer 2:31:30 API System Diagram 2:41:59 L3 Gateway vs L7 Gateway 2:45:03 L4 Load Balancer vs L7 Load Balancer 2:46:12 Complete API Flow End to End 2:49:41 How Gateway Routes Requests to Microservices 2:56:28 How Responses Are Sent Back to Client 3:27:13 Summary – How API and Internet Work ⭐️⭐️ Don't forget to subscribe to my channel! ⭐️⭐️ ■ Subscribe URL :    / @mohitchhabratech   Thank you for your support! Subscribe ‪@MohitChhabraTech‬ ╔═╦╗╔╦╗╔═╦═╦╦╦╦╗╔═╗ ║╚╣║║║╚╣╚╣╔╣╔╣║╚╣═╣ ╠╗║╚╝║║╠╗║╚╣║║║║║═╣ ╚═╩══╩═╩═╩═╩╝╚╩═╩═╝ How API Works | Client Server Architecture Explained | DNS, TCP, TLS, Gateway, Load Balancer, Firewall | Internet Basics Ever wondered how the Internet really works behind the scenes? In this detailed video, I’ll explain everything from Client-Server Communication, API Requests, DNS resolution, TCP & TLS handshakes, to Load Balancer, Gateway, and Firewall architecture — in the simplest way possible. By the end of this video, you’ll clearly understand how an API request travels across the internet — from your browser to the backend server — and how different components like DNS, TCP, TLS, Gateway, and Load Balancer make it secure and reliable. 📘 Topics Covered: What is API, Client, Server, and Database How DNS Works & Finds IP Address TCP 3-Way Handshake Explained TLS & HTTPS Security Role of Firewall, Gateway & Load Balancer L3, L4, and L7 Gateways & Load Balancers Complete API Flow from Request to Response 💡 Perfect for beginners preparing for System Design, Backend Development, or Network Fundamentals. 🔔 Subscribe for more videos on System Design, DSA, and Software Engineering concepts explained in simple Hindi! #API #SystemDesign #InternetWorking #BackendDevelopment #NetworkingBasics #TechEducation how api works what is api api explained client server architecture how internet works dns explained tcp handshake tls handshake firewall explained gateway explained load balancer explained l3 vs l7 gateway l4 vs l7 load balancer api flow explained backend architecture system design basics networking basics for beginners how api request works how server works api request and response system design interview backend development tutorial internet working explained how dns works tcp vs udp tls vs ssl how api connects to server #API #SystemDesign #InternetWorking #BackendDevelopment #NetworkingBasics #SoftwareEngineering #TechExplained #ComputerScience #WebDevelopment #LearnSystemDesign DISCLAIMER: All opinions shared on this channel are our own and don't express views or opinions of our employers. We only use our experiences and public knowledge to make our content. NO CONFIDENTIAL INFORMATION of our employers is used or shared on this channel.