Internet brings... new time-space independency (web, telnet) new communication cultures. new information management possibilities new markets

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1 Internet brings... new time-space independency (web, telnet) new communication cultures new information management possibilities new markets cnlab / HSR 11/8/01 26

2 Time-space independency WWW-Client Browser telnet://rzubiz.unizh.ch WWW-Server Serverprogram Hypertext-/ HTML-Page (Homepage) Microsoft Internet Explorer Netscape Communicator cnlab / HSR 11/8/01 27

3 Time-space independency WWW-Client Browser Request, Input telnet://rzubiz.unizh.ch WWW-Server Serverprogram Hypertext-/ HTML-Page (Homepage) Microsoft Internet Explorer Netscape Communicator cnlab / HSR 11/8/01 27

4 Time-space independency WWW-Client Browser Request, Input telnet://rzubiz.unizh.ch WWW-Server Serverprogram Hypertext-/ HTML-Seite (Homepage) Reply, Output Hypertext-/ HTML-Page (Homepage) Microsoft Internet Explorer Netscape Communicator cnlab / HSR 11/8/01 27

5 Telnet (remote login) Local Host Remote Host Ausgabe CPU telnet Eingabe Netzwerk cnlab / HSR 11/8/01 30

6 Was nützt telnet? Zugriff zu Rechnern von Bibliotheken (ZB/ETH) speziellen Diensten (ETV) kommerziellen Datenbanken (Datastar) Supercomputerzentren cnlab / HSR 11/8/01 31

7 Time-Space the path of data packets cnlab01.cnlab.ch 1 router.cnlab.ch ( ) 7 ms 5 ms 5 ms 2 ascend.winweb.ch ( ) 302 ms 65 ms 34 ms 3 tointernet.twi.ch ( ) 36 ms 37 ms 39 ms 4 wi00-srl4.unisource.ch ( ) 84 ms 40 ms 41 ms 5 i79zhh.unisource.ch ( ) 513 ms 350 ms 113 ms 6 atlantacr2.bbnplanet.net ( ) 568 ms 303 ms 173 ms 7 atlantabr1.bbnplanet.net ( ) 171 ms 207 ms 223 ms ihtfp.mit.edu ( ) 1248 ms 1546 ms 2172 ms 15 e16rtrfddi.mit.edu ( ) 1735 ms 1297 ms 1250 ms 16 lexus.media.mit.edu ( ) 1364 ms 1105 ms 1315 ms 17 nexus2.media.mit.edu ( ) 1229 ms 1233 ms 1622 ms 18 ( ) 1279 ms 1393 ms 1354 ms tracert cnlab / HSR 11/8/01 32

8 WWW: Hypertext-Prinzip index.html LiveCam cnlab / HSR 11/8/01 33

9 WWW: Hypertext-Prinzip repertoire.html index.html LiveCam cnlab / HSR 11/8/01 33

10 WWW: Hypertext-Prinzip repertoire.html index.html findus.html LiveCam cnlab / HSR 11/8/01 33

11 WWW: Hypertext-Prinzip repertoire.html Internet index.html index.html findus.html LiveCam cnlab / HSR 11/8/01 33

12 WWW: Hypertext-Prinzip repertoire.html Internet index.html index.html findus.html LiveCam cnlab / HSR 11/8/01 33

13 Recap: Data Highway, Domain, Host, Directory, Page COM DE FAQ: How to Loire FR FR Bordeaux Château Latour cnlab / HSR 11/8/01 34

14 Recap: Data Highway, Domain, Host, Directory, Page COM DE FAQ: How to Loire FR FR Bordeaux Château Latour cnlab / HSR 11/8/01 34

15 Identify Resources: Uniform Resource Locator (url) 1. Scheme links talks cnlab.ch dfn.de switch.ch greenpeace.org cnlab / HSR 11/8/01 35

16 Identify Resources: Uniform Resource Locator (url) 2. Web-Server links talks cnlab.ch dfn.de switch.ch greenpeace.org cnlab / HSR 11/8/01 36

17 Identify Resources: Uniform Resource Locator (url) 3. Directory links talks cnlab.ch dfn.de switch.ch greenpeace.org cnlab / HSR 11/8/01 37

18 Identify Resources: Uniform Resource Locator (url) 4. File links talks cnlab.ch dfn.de switch.ch greenpeace.org cnlab / HSR 11/8/01 38

19 Access to Resources: Uniform Resource Locator (URL) and Helper Applikationen Browser WWW Server Mail news:ch.market News HTML-Seite telnet://pc-x.hsr.ch telnet ftp://ftp.ietf.org/ Mail Server mail.cnlab.ch FTP Server News Server ftp.ietf.org telnet Server pc-x.hsr.ch news.bluewin.ch telnet, https cnlab / HSR 11/8/01 39

20 Internet, Intranet, Extranet Internet Firewall Extranet WWW-Server Firewall Intranet Intra-WWW-Server cnlab / HSR 11/8/01 40

21 Internet, Intranet, Extranet Internet Public universal access No security Firewall Extranet WWW-Server Firewall Intranet Intra-WWW-Server cnlab / HSR 11/8/01 40

22 Internet, Intranet, Extranet Internet Public universal access No security Firewall Extranet WWW-Server Firewall Private, limited access Tightly controlled security Intranet Intra-WWW-Server cnlab / HSR 11/8/01 40

23 Internet, Intranet, Extranet Internet Public universal access No security Firewall WWW-Server Firewall Extranet Trusted partners members only Shared security Private, limited access Tightly controlled security Intranet Intra-WWW-Server cnlab / HSR 11/8/01 40

24 time and space independency conclusion: the world a mouseclick away Connect to any computer globally Get information from anywhere immediately Subsecond response time of the technology 7 times 24 hours availability of services High expectations on responsiveness Enormous speed of developments cnlab / HSR 11/8/01 41

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