Network Guru

In networking, a port number acts like a door or channel inside a device that allows specific types of data to enter or exit. While the IP address tells you where data should go, the port number tells you which application should receive it. Think of it like this: IP Address = Apartment Building Port Number = Apartment Number 🎯 Why Are Port Numbers Important? 🟦 1. They Keep Apps Talking to the Right Services Your web browser, email app, games, and video calls all use different ports. 🔐 2. Essential for Security & Firewalls Firewalls allow or block traffic based on port numbers . Open ports = entry points Closed ports = safer system 🛠 3. Helps Troubleshoot Network Issues If an app isn’t loading, the port is often the issue. 🧠 Real-Life Examples of Port Numbers Everyday Activity Port Number Why It's Used Browsing websites 80 / 443 HTTP/HTTPS Online banking/login 443 Secure HTTPS WhatsApp Web 5222 / 443 Messaging protocol Email ...

TCP vs UDP: Understanding the Internet’s Two Most Important Messengers Every time you open a website, watch a YouTube video, or play an online game, your data travels across the internet using specific rules called transport protocols . The two most widely used ones are TCP and UDP . Think of them as two different postal services - one focused on accuracy, the other on speed. Understanding them gives you a deeper look into how the internet really works. 🧑‍🤝‍🧑TCP - The Reliable Courier Imagine sending a fragile package that must arrive safely and in order. That’s how TCP (Transmission Control Protocol) behaves. Why TCP Is Reliable Connection-oriented handshake TCP starts with a “Ready? Ready. Go!” conversation before any data moves. Guaranteed delivery Every packet is tracked, acknowledged, and resent if lost. Proper sequencing Packets arrive exactly in the order they were sent. Flow and congestion control TCP adapts to network conditions to avoid overwhelming the ...

  If you have ever sent a Message, joined a Zoom call, streamed a Movie, or asked Google a question - congratulations, you have used networking. But the irony is… most people use networks all day without realizing what’s happening behind the scenes. In today’s hyper-connected world, computer networking is not just a technical concept. It’s the  engine that keeps our businesses, homes, and digital lives running smoothly . Let’s break it down in a simple and friendly way. What Exactly Is Networking? At its core, networking is all about  connecting devices so they can communicate . Think of it like a digital highway system: Your  phone , laptop, TV, smartwatch, and office computers are the  vehicles . The  network cables, Wi-Fi, and routers  are the  roads . And the  rules  that decide how data travels (like TCP/IP) are the  traffic laws . When these elements work together, your device knows exactly where to send information - whether ...