Internet (1)

Chapter 1: Introduction

  • The Internet is defined as a network of computer networks, the largest worldwide communication network.

  • It connects various main networks like Google, Yahoo, and Amazon.

  • Protocols are guidelines that enable communication and data exchange between computers on the Internet.

Internet History

  • 1962: JCR Licklider envisioned a globally interconnected set of computers for access to data/programs.

  • J.C.R. Licklider: An influential figure in computer science and psychologist.

  • 1969: ARPANET was created for military purposes to share information in case of a nuclear attack.

  • Lawrence Roberts noted Licklider's vision of intergalactic networking.

Chapter 2: Internet Protocol

  • Ray Tomlinson sent the first email in 1971.

  • 1972: Public demonstration of ARPANET and the introduction of email applications.

  • 1983: Adoption of TCP/IP protocols, allowing for larger networks.

  • 1989: Birth of the World Wide Web (WWW), which is based on HTTP protocol.

  • 1995: The web became commercialized, distinguishing it from the broader Internet.

Chapter 3: World Wide Web

  • The World Wide Web is a collection of interlinked multimedia documents stored on the Internet.

  • It is accessed via the HTTP protocol.

  • Tim Berners-Lee founded the Web Consortium (W3C) to regulate the web's standards and guidelines.

  • Three fundamental technologies of the WWW: HTML, URL (Uniform Resource Locator), and HTTP.

  • Protocols are crucial for data transmission reliability and security.

Secure Protocols

  • HTTPS: A secure version of HTTP that encrypts information to protect it from eavesdropping.

  • Commonly used by financial institutions for secure transactions.

Chapter 4: Internet Protocol (continued)

  • Internet Service Providers (ISPs) connect users to the Internet using various technologies: dial-up, DSL, cable modem, wireless, fiber optic.

  • IP Address: A unique number assigned to every device on the Internet, usually dynamic and provided by the ISP.

  • Domain Name System (DNS): Translates domain names (e.g., www.example.com) into IP addresses for easier access to websites.

Chapter 5: Other Internet Protocols

  • Besides HTTP, other protocols include FTP (File Transfer Protocol) and SMTP (Simple Mail Transfer Protocol for emails).

  • Intranets are private networks used by organizations, employing Internet technologies but accessible only to limited users.

Chapter 6: Conclusion

  • The Internet has become an integral part of everyday life, connecting diverse devices beyond just computers.

  • The rapid evolution of the Internet raises questions about future developments and innovations.