📖 Lesson Introduction to Networks 1 скачать в хорошем качестве

📖 Lesson Introduction to Networks 1

📖 Lesson: Introduction to Networks 🧠 Essential Question What networks do you use daily, and how do they impact your life? 🧩 What Is a Network? A network is a group of two or more devices connected together to share information or resources. These resources might include files, printers, apps, or even an internet connection. Think of a network like a digital road system. Devices are the cars, and the cables or Wi-Fi signals are the roads. Just like cars move from one place to another, data moves across the network from one device to another. There are many kinds of networks, depending on their size and purpose: Type of Network Description Example PAN Personal Area Network Bluetooth between phone and earbuds LAN Local Area Network Your school Wi-Fi MAN Metropolitan Area Network City-wide university network WAN Wide Area Network The Internet 🌐 Internet vs. Intranet vs. Extranet Not all networks are open to everyone. Here’s how we distinguish between the three most common types: Network Type What It Means Example Internet A global network that anyone can access. Browsing Google, YouTube, TikTok Intranet A private network used inside an organization (school, company, etc). Accessing Canvas or internal file servers Extranet A private network that allows limited access to outside users. Logging into the school VPN from home 🔎 Tip: Intranet = Internal Extranet = External users with permission 🖥️ Common Networking Devices To understand how networks work, you need to recognize the hardware that connects everything together: Device What It Does Router Connects different networks (like your LAN to the Internet) Switch Connects multiple devices inside a LAN Access Point Provides wireless connections to a wired network Modem Translates data between your network and your Internet provider Client Any device that uses the network (e.g., your phone or laptop) Server A device or system that provides data or services over the network 🧠 Real-Life Example Let’s walk through a simple example of how you use networks daily: You open your school laptop, connect to the Wi-Fi, and access Canvas to turn in an assignment. You’re on your school’s LAN. Canvas runs on the school intranet. If you go home and access Canvas using a VPN, you’re now connecting via an extranet. The router sends your data to the Internet and back. Your laptop is the client, and Canvas is the server.