Internet

global system of connected computer networks based on IP addressing and routing protocols From Wikipedia, the free encyclopedia

Internet
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The Internet is the world’s largest global communication network for computers and other devices. It connects many smaller networks from homes, schools, businesses, and governments. These networks share different kinds of information. The short form of the Internet is “the Net.” One of its most popular services is the World Wide Web, which is used by billions of people every day.

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Logo of DARPA, an organization funded by the US government, which helped develop the Internet

The Internet was developed in the United States by the Department of Defence Advanced Research Projects Agency (DARPA). The Internet was first connected in October 1969[1] and was called ARPANET. The World Wide Web was created at CERN in Switzerland in 1990 by a British (UK) scientist named Tim Berners-Lee.

Today, people use Internet services by paying Internet service providers (ISPs). Some websites and tools are free, while others may show ads to earn money. There are also ongoing debates about censorship and freedom of speech on the Internet.

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Services

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Visualization of Internet routing paths

The Internet is used for many things, such as electronic mail, online chat, file transfer and other documents of the World Wide Web.

The most used service on the Internet is the World Wide Web (which is also called the "Web" or “www”). The web contains websites, including social media, blogs, and wikis like Wikipedia. Webpages on the Internet can be seen and read by anyone (unless the page needs a password, or it is blocked).

The second biggest use of the Internet is to send and receive e-mail. E-mail is private and goes from one user to another. Instant messaging is similar to email, but allows two or more people to chat to each other faster.

Some governments think the internet is a bad thing, and block all or part of it. For example, the Chinese government thinks that Wikipedia is bad, so often no one in China can read it or add to it.[2] Another example of the internet being blocked is in North Korea.[3] Some parents and schools block parts of the Internet they think are bad for children to see.

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Dangers

The Internet makes communication easy. Yet, communication can be dangerous, too. People often send secret information, and sometimes other people can steal that information. They can use the Internet to spread lies, steal secrets, or give dangerously bad advice. For example, Facebook has had some problems with privacy settings.

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Outline and overview

The Internet is a worldwide network of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP). It is a "network of networks" that has millions of interconnected smaller domestic, academic, business, and government networks, which together carry various information and services, such as electronic mail, online chat, file transfer, and the interlinked Web pages and other documents of the World Wide Web. The general public are allowed to use the internet, in almost all countries.

Internet has these features,


Internet communication technology:

Internet infrastructure:

Internet communication protocols:

Internet protocol suite –

Link layer –

Internet layer –

  • Internet Protocol (IP) –
  • Internet Control Message Protocol (ICMP) –
    • ICMPv6 –
  • Internet Group Management Protocol (IGMP) –

Transport layer –

  • Transmission Control Protocol (TCP) –
  • User Datagram Protocol (UDP) –
  • Datagram Congestion Control Protocol (DCCP) –
  • Stream Control Transmission Protocol (SCTP) –
  • Resource reservation protocol (RSVP) –
  • Explicit Congestion Notification (ECN) –
  • QUIC

Application layer –

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Related pages

References

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