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computer science

Usenet

Usenet is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Usenet rather than just read about it. In short: Usenet (), short for User's Network, is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture.

Usenet — main illustration
Usenet — illustration

Key takeaways

  • Usenet belongs to computer science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Usenet to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Usenet from memory before moving on to harder problems.

Reference excerpt

Usenet (), short for User's Network, is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Ellis conceived the idea in 1979, and it was established in 1980. Users read and post messages (called articles or posts, and collectively termed news) to one or more topic categories, known as newsgroups. Usenet resembles a bulletin board system (BBS) in many respects and is the precursor to the Internet forums that were developed after the introduction of the World Wide Web. Discussions are threaded, as with web forums and BBSes, though posts are stored on the server sequentially. A major difference between a BBS or web message board and Usenet is the absence of a central server and dedicated administrator or hosting provider. Usenet is distributed among a large, constantly changing set of news servers that store and forward messages to one another via "news feeds". Individual users may read messages from and post to a local (or simply preferred) news server, which can be operated by anyone, and those posts will automatically be forwarded to any other news servers peered with the local one, while the local server will receive any news its peers have that it currently lacks. This results in the automatic proliferation of content posted by any user on any server to any other user subscribed to the same newsgroups on other servers. As with BBSes and message boards, individual news servers or service providers are under no obligation to carry any specific content, and may refuse to do so for many reasons: a news server might attempt to control the spread of spam by refusing to accept or forward any posts that trigger spam filters, or a server without high-capacity data storage may refuse to carry any newsgroups used primarily for file sharing, limiting itself to discussion-oriented groups. However, unlike BBSes and web forums, the dispersed nature of Usenet usually permits users who are interested in receiving some content to access it simply by choosing to connect to news servers that carry the feeds they want. Usenet is culturally and historically significant in the networked world, having given rise to, or popularized, many widely recognized concepts and terms such as "FAQ", "flame", "sockpuppet", and "spam". In the early 1990s, shortly before access to the Internet became commonly affordable, Usenet connections via FidoNet's dial-up BBS networks made long-distance or worldwide discussions and other communication widespread.

The name Usenet comes from the term "users' network". The first Usenet group was NET.general, which quickly became net.general. The first commercial spam on Usenet was from immigration attorneys Canter and Siegel advertising green card services. On the Internet, Usenet is transported via the Network News Transfer Protocol (NNTP) on Transmission Control Protocol (TCP) port 119 for standard, unprotected connections, and on TCP port 563 for Secure Sockets Layer (SSL) encrypted connections.

… excerpt ends here. Continue reading the full article.

Illustrations

Usenet: A 2004 discussion in the Usenet group comp.text.tex
A 2004 discussion in the Usenet group comp.text.tex
Usenet: A diagram of Usenet servers and clients. The coloured dots on the servers represent the newsgroups they carry. Coloured arrows between servers indicate newsgroup content exchanges (news feeds). Arrows between clients and servers indicate that a user is subscribed to a certain newsgroup and reads or submits articles there.Notably, clients never connect with each other, but still have access to each other's posts even when they also never connect to the same server.
A diagram of Usenet servers and clients. The coloured dots on the servers represent the newsgroups they carry. Coloured arrows between servers indicate newsgroup content exchanges (news feeds). Arrows between clients and servers indicate that a user is subscribed to a certain newsgroup and reads or submits articles there.Notably, clients never connect with each other, but still have access to each other's posts even when they also never connect to the same server.
Usenet illustration
Usenet: Usenet Provider Map
Usenet Provider Map
Usenet: The "Big Nine" hierarchies of Usenet
The "Big Nine" hierarchies of Usenet

Worked examples

Example 1 — a first encounter with Usenet

Start with the simplest possible case. Write down what Usenet claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Usenet before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Usenet ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Usenet

In research
Usenet appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Usenet in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Usenet is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1980 establishments in North Carolina, Computer-mediated communication, Computer-related introductions in 1980, so understanding it makes those chapters shorter.
In everyday life
Look for Usenet outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Usenet in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Usenet means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Usenet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Usenet in simple terms?

Usenet (), short for User's Network, is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture.

Why does Usenet matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Usenet?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Usenet.

Tags

  • 1980 establishments in North Carolina
  • Computer-mediated communication
  • Computer-related introductions in 1980
  • Computer networks
  • Fediverse
  • History of the Internet
  • Internet Protocol based network software
  • Internet Standards
  • Internet properties established in 1980
  • Internet protocols
  • Online chat
  • Pre–World Wide Web online services

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