Understanding Online Media and Their Uses - Science Communication Program

How the Internet works?
before do the presentation, download materials from the computer
ftp://hkim@202.30.23.142/
with command line method.

and

^<| Slide show


1. Intro

Hyo Kim (김효동)

아주대학교 정보통신대학 미디어학부
http://wiki.commres.org
hkim@commres.org
hkimscil

2. Sending your request with a browser, IE 

http://google.com
Google.png
google page [PNG image (34.01 KB)]

http://naver.com
Naver.png
naver page [PNG image (326.87 KB)]

http://daum.net
Daum.png
daum page [PNG image (271.3 KB)]

3. Server Side

Address URL: http://www.daum.net
The computer at the address (URL), daum.net is responding "Who talked to me? http "
WWW daemon response
Things (software) called WWW daemon, WWW server, HTTPD
e.g.,
[http]Apache.org(http://Apache.org)
[http]Using IIS(http://www.webwizguide.com/kb/asp_tutorials/installing_iis_winXP_pro.asp) Internet Information Service, the MS Windows

Daum case
Daemon

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="ko" xml:lang="ko">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Daum - 우리들의 UCC 세상, 다음</title>
<link rel="alternate" type="application/rss+xml" title="Daum - Top Stories [RSS]" href="http://www.daum.net/rss.xml" />
<link rel="search" type="application/opensearchdescription+xml" href="http://top-sc.daum-img.net/w3c/OpenSearch.xml" title="다음" />
<style type="text/css">
 . . . . 
</style>
</head>

<body>
<div id="tier_top_wrap">
<div id="tier_top_alpha"></div>
<div id="tier_top_expand"></div>
</div>
<div id="wrap">
<div id="tier_head_wrap">
<div id="tier_head_expand"></div>
</div>
<div id="head_wrap">
<div id="logo_area">
<h1><a href="http://www.daum.net/?t__nil_logo=daum" rel="home"><img src="http://icon.daum-img.net/top/cms/logo/2009/03/nano54000661083828358.gif" width="200" height="107" alt="다음" /></a></h1>
<ul>
. . . . 

</body>
</html>

A document which is composed of tags + information
<html>
<head>
Some information (meta info) goes here such as
<title>
this is the title of this page
</title>
</head>
<body>
Some information goes here. This is the body information of this web page.
</body>
</html>

Now this information goes back to where the request came from (that is, your computer).

4. Transferring method: How is it transfer?

TCP/IP
  1. TCP/IP -> IP packet (-ized) information
    disecting the information into many parts (which has the same specification).
    (see http://www.networksorcery.com/enp/protocol/ip.htm)
    Also
  2. IP address
    IP address? 202.30.23.142
    32 bits addressing number is used in TCP/IP
    8 bits = 1 computer bytes
    Hence, 32 bits address = 4 computer bytes
    One bytes = (256 variation)
    00000000, 00000001, 00000010, 00000011, 00000100, 00000101, 00000110, 00000111, 00001000 .......and all the way up to 11111111.
    If you count this numbers, there are 256 numbers.
    Hence, we have 256 x 256 x 256 x 256 numbers which can be used as computer addresses!
    These numbers can be assigned to every (networked) computer on the earth!
  3. Daum.net? Let's check with [http]samspade.org service(http://samspade.org)
    211.115.77.213
    Who assign these? --> some organization assigned by each nation.
  4. But, I used domain name, a URL daum.net, not the strange looking number.
    We use domain name
Domain Name
Domain name
211.115.77.213
one-byte numberseparator . . .
translated to . . .
daum.net
terms.co.kr

These name should not be duplicated! (The right to use the domain name should be assigned by the authority).
see, http://www.nic.or.kr/

Also, we need to some machine to match these two (IP -> domain name and domain name -> IP address).
This is called DNS (Domain Name Server).
[http]What happened(http://ko.wikipedia.org/wiki/1%C2%B725_%EC%9D%B8%ED%84%B0%EB%84%B7_%EB%8C%80%EB%9E%80) in Korea.

Then how is it delivered?
See [http]packet method(http://www.pbs.org/opb/nerds2.0.1/geek_glossary/packet_switching_flash.html) (You need flash player installed in (with) your favorite browser)

5. Then, what else than http

TcpipApplication.png
application in tcpip [PNG image (13.04 KB)]

Or many other such as
telnet
ssh
smtp
imap
NNTP
...
ftp e.g., ftp://hkim@commres.org/ or ftp://202.30.23.144
and many other. see, WikiPedia:programs that we might not know all for more information.

6. History

See Internet History for more information. See also WikiPedia:Usenet.

  1. TCP/IP
  2. [http]Gutenberg Project(http://www.gutenberg.org/wiki/Main_Page) from 1971
    see, Free Software
    e.g., [http]Moniwiki bbs(http://kldp.net/forum/?group_id=210) at [http]kldp/moniwiki(http://kldp.net/projects/moniwiki/)
  3. Usenet uses
    Usenet
    usenet.png
    [PNG image (17.9 KB)]

    300px-Usenet_Big_Nine.svg.png
    [PNG image (89 KB)]

    Top30giganews.png
    [PNG image (12.89 KB)]

    Terms used in the Usenet
    • Breidbart Index
    • Cross-post
    • FAQ
    • Flaming and flame war
    • Flood aka flooders and flooding
    • FWAK
    • Godwin's Law
    • It's always September See WikiPedia:Eternal September
    • kill file
    • list of newsgroups
    • MSTing
    • scorefile
    • sock puppet
    • sporgery
    • Trolling
    • Usenet Death Penalty
    • Usenet cabal
    • Wackyparsing
    • X-No-Archive
  4. WWW
    see InternetHistory#s-1.25
    also TimBerners-Lee
  5. Yahoo, Google, naver, etc.
    see Internet Development
  6. Web 2.0 ?

7. Points

  1. The internet once was open technology and still is.
    1. Gutenberg, Usenet -> flicker, 지식인, facebook, cyworld, . . .
    2. Gateway computer design
    3. TCP/IP design, etc.
  2. Under these environment, many things (that are considered good) happened.
    • asynchronous, synchronous communication through many technologies
      • yahoo, dell, google
    • These companies are not just results from a vacuum state.
    • They need an open sphere
  3. This should happen to us, too. . . .
    See, InternetDevelopment#s-2 Internet portal

8. Portal service ?

Retrieved from http://wiki.commres.org//OnLineMediaAndTheirUse/Presentation
last modified 2012-05-08 14:46:24