TheSecondAssignment › SatelliteTelevision › IndependentProductions › GraduateStudentConsulting › DecipheringTheHueriglyphics › OnLineMediaAndTheirUse/Presentation
How the Internet works?
before do the presentation, download materials from the computer
ftp://hkim@202.30.23.142/
with command line method.
before do the presentation, download materials from the computer
ftp://hkim@202.30.23.142/
with command line method.
and
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
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.,
Daum casee.g.,
Daemon
A document which is composed of tags + information<!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>
<html>
<head>
<body>
</html>
Now this information goes back to where the request came from (that is, your computer).<head>
Some information (meta info) goes here such as
<title>
</head><title>
this is the title of this page
</title><body>
Some information goes here. This is the body information of this web page.
</body></html>
4. Transferring method: How is it transfer? ¶
TCP/IP
These name should not be duplicated! (The right to use the domain name should be assigned by the authority).
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).
Then how is it delivered?
- TCP/IP -> IP packet (-ized) information
disecting the information into many parts (which has the same specification).
Also
- 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.Hence, we have 256 x 256 x 256 x 256 numbers which can be used as computer addresses!
If you count this numbers, there are 256 numbers.
These numbers can be assigned to every (networked) computer on the earth!
- Daum.net? Let's check with samspade.org service
211.115.77.213
Who assign these? --> some organization assigned by each nation.
- But, I used domain name, a URL daum.net, not the strange looking number.
We use domain name
Domain name | ||||||
211 | . | 115 | . | 77 | . | 213 |
one-byte number | separator | . . . | ||||
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).
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).
5. Then, what else than http ¶
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, programs that we might not know all for more information.
ssh
smtp
imap
NNTP
...
ftp e.g., ftp://hkim@commres.org/ or ftp://202.30.23.144
and many other. see, programs that we might not know all for more information.
6. History ¶
- TCP/IP
- Gutenberg Project from 1971
- Usenet uses
Usenet
[PNG image (17.9 KB)]
[PNG image (89 KB)]
[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 Eternal September
- kill file
- list of newsgroups
- MSTing
- scorefile
- sock puppet
- sporgery
- Trolling
- Usenet Death Penalty
- Usenet cabal
- Wackyparsing
- X-No-Archive
- Breidbart Index
- WWW
- Yahoo, Google, naver, etc.
- Web 2.0 ?
7. Points ¶
- The internet once was open technology and still is.
- Gutenberg, Usenet -> flicker, 지식인, facebook, cyworld, . . .
- Gateway computer design
- TCP/IP design, etc.
- Gutenberg, Usenet -> flicker, 지식인, facebook, cyworld, . . .
- Under these environment, many things (that are considered good) happened.
- asynchronous, synchronous communication through many technologies
- yahoo, dell, google
- yahoo, dell, google
- These companies are not just results from a vacuum state.
- They need an open sphere
- asynchronous, synchronous communication through many technologies
- This should happen to us, too. . . .
See, InternetDevelopment#s-2 Internet portal