---
title: "How the internet evolved"
subject: "Web Technology"
chapter: 1
key: "semester_7/web_technology:internet-evolution"
source: https://www.bctengineer.com/q/semester_7/web_technology/internet-evolution
site: BCT Engineering
---

# How the internet evolved

Web Technology · Chapter 1: Introduction

- Asked in: 2076 Chaitra, 4 marks
- Video: [Evolution of the Internet!](https://www.youtube.com/watch?v=p5mASvEvDZc) — Sabin Civil Engineering
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/web_technology/internet-evolution
- Whole chapter: https://www.bctengineer.com/md/semester_7/web_technology/chapter-1

## Question

Explain how internet evolved.

## Short answer

The Internet evolved from ARPANET (1969) with packet switching, then TCP/IP in 1983 enabling internetworking, followed by NSFNET backbone, commercialization and World Wide Web in the 1990s, and later broadband, mobile, and cloud.

## Answer

The **Internet** is a global network of interconnected computer networks that use the TCP/IP protocol suite. It grew from a small research project into the worldwide network of today.

#### Stages of evolution
1. **1960s – ARPANET:** The US Department of Defense (ARPA) funded a packet-switching network to link research computers. The first message was sent from UCLA to the Stanford Research Institute (SRI) in 1969. Packet switching (Paul Baran, Donald Davies) made the network robust.
2. **1970s – Internetworking:** Many separate networks appeared (ARPANET, packet radio, satellite). Vint Cerf and Robert Kahn designed TCP/IP so that different networks could talk to each other. Email appeared in 1971 (Ray Tomlinson).
3. **1983 – TCP/IP adoption:** ARPANET switched to TCP/IP on 1 January 1983. DNS was introduced in 1984 to replace host tables.
4. **1980s – NSFNET:** The National Science Foundation built a high-speed backbone linking universities and supercomputer centres. This became the backbone of the academic Internet.
5. **1990s – Commercialisation and the Web:** Restrictions on commercial traffic over NSFNET were eased from 1991, commercial ISPs started selling access, and NSFNET was retired in 1995 when commercial networks took over the backbone. Tim Berners-Lee created the World Wide Web (1989-91) and browsers such as Mosaic and Netscape made the Internet easy for ordinary users.
6. **2000s onward – Broadband, mobile and social:** Broadband, Wi-Fi, smartphones, social media, cloud computing and the Internet of Things made the Internet part of daily life.

```text
ARPANET (1969) -> TCP/IP (1983) -> NSFNET (1986)
      -> Commercial ISPs + WWW (1990s)
      -> Broadband / Mobile / Cloud / IoT (2000s+)
```

In Nepal, commercial email service began in 1994 through Mercantile Communications, and full Internet access followed in 1995.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Why did Vint Cerf and Robert Kahn design TCP/IP in the 1970s?
   A. So that many different separate networks could communicate with each other
   B. To create the World Wide Web
   C. To replace email with a faster service
   D. To make ARPANET use only satellite links
   Answer: A. Many separate networks (ARPANET, packet radio, satellite) existed, and TCP/IP was designed to let them interwork. (Key point: Role of TCP/IP)

2. What did packet switching give the early ARPANET?
   A. Graphical browsing
   B. Robustness of the network
   C. Free commercial access
   D. Domain names
   Answer: B. The answer states packet switching made the network robust. (Key point: Packet switching)

3. What was the role of NSFNET in the 1980s?
   A. The first web browser
   B. The protocol that replaced DNS
   C. A high-speed backbone linking universities and supercomputer centres
   D. A commercial ISP for home users
   Answer: C. NSFNET was built by the NSF as the academic backbone of the Internet. (Key point: NSFNET)

4. Which events made the Internet easy and available for ordinary users in the 1990s?
   A. Introduction of DNS and email only
   B. Adoption of TCP/IP by ARPANET only
   C. Arrival of smartphones and cloud computing
   D. Lifting of NSFNET restrictions (1995), ISPs selling access, the Web and browsers like Mosaic
   Answer: D. ISPs, the Web and graphical browsers made it accessible; smartphones and cloud came in the 2000s. (Key point: Commercialisation)

## Related in Web Technology

- [Internet evolution and importance of web technology](https://www.bctengineer.com/question.md?key=semester_7%2Fweb_technology%3Ainternet-evolution-web-importance) — Web Technology, chapter 1