Networking Essentials
Ever wondered how the internet actually works? From home Wi-Fi to global connections, it all starts with networks. Learn the basics of LAN and WAN, Foundations of subnetting, routers, switches and IP addresses, the key internet protocols and NAT that make everything run.
If you're new here, we recommend starting with What is an IP Address? to understand the foundation. Then, check out Internet Infrastructure Components and How the Internet Works for a behind-the-scenes view of how data travels across the web. Want more context? Explore The History of the Internet and the Evolution of IP Addressing to see how we got here.
By the end of this section, you’ll have a clear understanding of how devices—from your smartphone to global servers—communicate across the web. We break down complex networking concepts into simple, digestible parts so you can truly understand how the internet connects everything around us.
Ready to dive in? Start exploring the essentials below.
Foundations of LAN & WAN
What Are Local Area Networks (LAN) and Wide Area Networks (WAN)?
Understand the basics of LAN and WAN, how they work, why they matter, and the vital role they play in connecting homes, offices, and the global internet.
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Foundations of Subnetting
What Is Subnetting and Why Does It Matter?
Explore how subnetting organizes networks, improves efficiency, and keeps data flowing smoothly. Learn the basics of subnet masks, CIDR, and how data travels from your device to the web.
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How Networks Transfer Data: Switches, Routers & IP Addresses
Learn how switches, routers, and IP types connect devices to the internet.
Learn how data flows online through routers, switches, and IP addresses. Understand public vs. private IPs and how devices get assigned dynamic or static IPs.
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Core Internet Protocols
Explore the Essential Protocols That Power Internet Communication
Learn how core protocols like ARP, DHCP, DNS, HTTP/HTTPS, TCP/IP, and more work together to enable web browsing, data transfer, and online connectivity.
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What is NAT (Network Address Translation)?
How One Public IP Can Power an Entire Network
Learn how NAT works to share IP addresses. Understand the differences between Static NAT, Dynamic NAT, and Hide NAT (also called NAPT), and how they impact your internet connection and security.
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