How TCP/IP Became the Backbone of the Internet

Ayndri
Ayndri
Research Analyst - Policy & Advocacy, CyberPeace
PUBLISHED ON
May 16, 2025
10

Introduction

Have you ever wondered how the internet works? Yes, there are screens and wires, but what’s going on beneath the surface? Every time you open a website, send an email, chat on messaging apps, or stream movies, you’re relying on something you probably don’t think about: the TCP/IP protocol suite. Without it, the internet as we know it wouldn’t exist. Let’s take a look at why this unassuming set of rules allows us to connect to anyone anywhere in the world. 

The Problem: Networks That Couldn't Talk to Each Other

The internet is widely called a network of networks. A network is a group of devices that are connected and can share data with each other. 

Researchers and governments began building early computer networks in the 1960s and 70s. But as the Cold War intensified, the U.S. military felt the need to establish a robust data-sharing infrastructure through interconnected networks that could withstand attacks. At the time, each network had different standards and protocols, which meant getting networks to communicate wasn’t easy or efficient. One network would have to be subsumed into another. This would lead to major problems in the reliability of data relay, flexibility of including more nodes, scalability of the interconnected network, and innovation.

The Breakthrough: Open Architecture Networking

This changed in the 1970s, when Bob Kahn proposed the concept of open architecture networking. It was a simple but revolutionary idea. He envisioned a system where all networks could talk to each other as equals. In this conceptualisation, all networks, even though unique in design and interface, could connect as peers to facilitate end-to-end communication. End-to-end communication helps deliver data between the source and destination without relying on intermediate nodes to control or modify it. This helps to make data relay more reliable and less prone to errors. 

Along with Vint Cerf, he developed a network protocol, the TCP/IP suite, that would go on to enable different networks across satellite, wired, and non-wired domains to communicate with one another.  

What Is TCP/IP?

TCP/IP stands for Transmission Control Protocol / Internet Protocol. It’s a set of communication rules that allow computers and devices to exchange information across different networks. 

It’s powerful because: 

  • Layered and open architecture: Each function (like data delivery or routing) is handled by a specific layer. This modular design makes it easy to build new technologies like the World Wide Web or streaming services on top of it.
  • Decentralisation: There's no single point of control. Any device can connect to another across the internet, making it scalable and resilient.
  • Standardisation: TCP/IP works across all kinds of hardware and operating systems, making it truly universal. 

The Core Components

  • TCP (Transmission Control Protocol): Ensures that data is delivered accurately and in order. If any piece is lost or duplicated, TCP handles it.
  • IP (Internet Protocol): Handles addressing and routing. It decides where each packet of data should go and how it gets there.
  • UDP (User Datagram Protocol): A lightweight version of TCP, used when speed is more important than accuracy, such as for video calls or online gaming.

Why It Matters

The TCP/IP protocol suite introduced a set of standardised guidelines that enable networks to communicate, thereby laying the foundation of the Internet. It has made the Internet global, open, reliable, interoperable, scalable, and resilient, — features because of which the Internet has come to become the backbone of modern communication systems. So the next time you open a browser or send a message, remember: it’s TCP/IP quietly making it all possible.

References

PUBLISHED ON
May 16, 2025
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