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CE80N Introduction to Networks & The Internet

CE80N Introduction to Networks & The Internet. Dr. Chane L. Fullmer UCSC Winter 2002. Class Schedule change. Tuesday, February 12 No Lecture Advising Day Revised syllabus on-line now. Class Details. Web page tutorial available on-line Web page submission: Email to venkat@cse.ucsc.edu

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CE80N Introduction to Networks & The Internet

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  1. CE80NIntroduction to Networks&The Internet Dr. Chane L. Fullmer UCSC Winter 2002

  2. Class Schedule change Tuesday, February 12 No Lecture Advising Day Revised syllabus on-line now CE80N -- Lecture #11

  3. Class Details • Web page tutorial available on-line • Web page submission: • Email to venkat@cse.ucsc.edu • Subject: cmpe080n-assgn4 • Final Exam • Last class session • March 14, 2002 CE80N -- Lecture #11

  4. Bulletin Board Service • Bulletin Board Services are discussion groups focused on specific topics. • Allowing posting of notices • (UCSC bus stops) • Providing ongoing discussions CE80N -- Lecture #11

  5. Electronic Bulletin Boards • An electronic bulletin board service combines the features of many communication mechanisms: • Allows anyone to post • Conventional bulletin board • Distributes to many subscribers • Newspaper • Focuses on single topic • Club CE80N -- Lecture #11

  6. Electronic Bulletin Boards • Propagates messages quickly • Similar to electronic mail • Informal discussion groups • Users listen to conversations, asks questions, interjects comments • Can be much like a social gathering CE80N -- Lecture #11

  7. Many, Many Bulletin Boards With Diverse Topics • Electronic bulletin boards cover a widely diverse group of topics. • Ranging in: • Knowledge required to participate • Number of participants • New groups are easily created. • AKA • Computer discussion group • Computer conference service CE80N -- Lecture #11

  8. Network News (Netnews) • A newsgroup is a bulletin board in a netnews system. • An article is a message in a newsgroup. • Headers similar to email • From, Subject, etc.. CE80N -- Lecture #11

  9. USENET • Loose consortium of network news sites • All sites participate in the exchange of network news. CE80N -- Lecture #11

  10. Newsgroup Names • The netnews system assigns each newsgroup a unique name. • Separated by periods • Group.subject.topic • Example: • rec.sport.baseball • Comp.std.wireless • Alt.sex.bondage CE80N -- Lecture #11

  11. Examples of major newsgroup classifications (prefixes) used by network news.

  12. Obtaining Network News • The user must have: • A computer participating in network news • Newsfeed or connection to network news service • News Server • Software to read articles • News reader (client) CE80N -- Lecture #11

  13. How Network News Appears To A User • An article appears in the same form as electronic mail message. • Includes a Header • From • Date • Subject • Has a Body • Text message from sender CE80N -- Lecture #11

  14. Checking For News Articles • Network news does not notify user of new activity in a newsgroup. • User checks newsgroups regularly • Keeps activity record in the software. CE80N -- Lecture #11

  15. Article Expiration • Network news articles are erased after a specified number of days. • 10 days – 2 weeks CE80N -- Lecture #11

  16. Reading Network News • Reading network news is straightforward. News reader : • Checks newsgroups • Provides summary of how many new articles are available Figure 21.1 An example of the summary a news reader presents. CE80N -- Lecture #11

  17. Selecting Articles • News reader allows user to read article by: • Prompting user • Articles are displayed one screenful at a time. • Using Space bar to bring up next screen • (or the scrollbar in web browsers) CE80N -- Lecture #11

  18. Subscribing And Unsubscribing • News reader keeps track of: • Joined newsgroups • Read articles • Information stored in a file on the hard drive. CE80N -- Lecture #11

  19. Submitting An Article • Submitting an article to a network newsgroup is as easy as sending electronic mail. • Using the news reader application CE80N -- Lecture #11

  20. Moderated Newsgroups • Moderator previews all newsgroup articles. • Minimizing disruptions or irrelevant comments Comp.std.wireless • Discusses wireless communication standards, and related topics. • Moderated by yours truly…. CE80N -- Lecture #11

  21. Size of Network News • By 2000, there were over 10,000 newsgroups in over 500 categories. • No one person can reasonably participate in all newsgroups. CE80N -- Lecture #11

  22. How Network News Works • Network news optimizes communication. • Transferring each article once. • Automatically distributing new articles at a scheduled time • NNTP (Network News Transfer Protocol) CE80N -- Lecture #11

  23. Redundant Newsfeeds • Some sites have a backup newsfeed to avoid losing articles during failures. • Software detects duplicates • Stores only one copy of each article CE80N -- Lecture #11

  24. Netnews And Electronic Mail • The same software can be used for netnews and e-mail. • Netscape, Internet Explorer.. • Message formats automatically convert from one to the other. CE80N -- Lecture #11

  25. Network News And Mailing Lists • These technologies allow millions to participate. • This has an interesting social effect: • Allows people from around the world to exchange views • Communities develop over common interests CE80N -- Lecture #11

  26. On-Line vs. Usual Interactions • Emotions can not be expressed by voice or gestures. • Discussions may end quickly. • Most statements receive responses because of the large audience. CE80N -- Lecture #11

  27. Difficulties of Internet Etiquette • Learning proper etiquette may be difficult. • Spanning many: • Cultures • Economic backgrounds • Levels of education CE80N -- Lecture #11

  28. Internet Etiquette • Do not make assumptions about the author. • Choose your words carefully. • Use constraint. • Do not take insults personally. • Use emotion icons such as smiley face :-) • Uppercase is SHOUTING • Ask for help if you are a novice CE80N -- Lecture #11

  29. Summary • The major BBS available on the Internet is network news. • News reader software allows users to read and post articles to newsgroups • Articles are posted for all to see • Netnews consists of thousands of individual BBS on diverse topics • Network Etiquette….. CE80N -- Lecture #11

  30. Extra Credit project See Me after class

  31. Glossary • Bulletin board service • A service that permits one person to post a message for others to read. • Computer conference • A communication among a set of individuals that uses the computer. CE80N -- Lecture #11

  32. Glossary • FAQ • (Frequently Asked Questions) A document containing questions and answers regarding a specific topic, technology, or Internet service. CE80N -- Lecture #11

  33. Glossary • Network news • (Netnews) The name of the Internet bulletin board service. • News article • A message that appears on a bulletin board in the network news service. CE80N -- Lecture #11

  34. Glossary • Newsfeed • An agreement by which one site sends copies of network news articles to another. • USENET • The term that applies to the group of computers that exchange network news. CE80N -- Lecture #11

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