The Internet as a Network of Networks
Picture how separate networks link together into the global internet.
The Internet as a Network of Networks is a free Network+ Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Network+ Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
One Giant Connection
The internet is not one company's network. It is many separate networks that agree to connect — which is why it is called a network of networks.
Autonomous Systems
Each big network that runs itself is an autonomous system (AS) — maybe a provider, university, or company. They cooperate to pass traffic along.
Common Rules Bind It
What unites all these networks is shared protocols, mainly the TCP/IP family. Common standards, not common ownership, hold the internet together.
No Single Owner
No one owns the internet. Groups like the IETF publish the standards everyone follows, and this decentralized design keeps it resilient and open.
Connecting the Pieces
Networks meet at an internet exchange point (IXP), swapping traffic directly. Without these junctions, data would take longer, costlier paths.
Routing Between Networks
To move data between autonomous systems, the internet uses BGP (Border Gateway Protocol). It is the glue deciding how packets cross providers.
Every Device Has an Address
To be reachable, every device needs a unique IP address. Each packet carries a destination address, and networks pass it along until it arrives.
Names Make It Usable
People cannot memorize numbers, so the Domain Name System (DNS) turns friendly names into the IP addresses machines use. It is the internet's directory.
Resilient by Design
The internet is built to keep working when parts break. With many possible paths between networks, traffic simply reroutes around a failed link. 🔁
Scale Beyond Imagination
Billions of devices, yet it works because no central system tracks everything. Each network handles its own part — the only way something this big can scale.
The Big Picture
Thousands of autonomous systems all speak TCP/IP and meet at exchange points. BGP routes between them, IP addresses identify devices, DNS names them.
Quick Check
What does network of networks mean?
Recap
The internet is a network of networks: independent autonomous systems cooperating via TCP/IP, with IP addresses and DNS, and no single owner.
Frequently asked questions
Is the “The Internet as a Network of Networks” lesson free?
Yes — the full text of “The Internet as a Network of Networks” is free to read here on the web, and the Network+ Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Network+ Academy course, upgrade to CoddyKit PRO.
What will I learn in “The Internet as a Network of Networks”?
Picture how separate networks link together into the global internet. You practise Network+ Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Network+ Academy?
No prior experience is required. Network+ Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “The Internet as a Network of Networks” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Network+ Academy lesson?
Yes. Every Network+ Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- The Internet as a Network of Networks
- What Happens When You Visit a Website
- Internet Service Providers and Backbones
- Bandwidth, Throughput, and Latency Basics