1. 7. WWW Internet Service Provider (ISP) E.g. AOL, Freeserve Internet Service Provider (ISP) E.g. AOL, Freeserve ISDN (64kbps/128kbps) Modem (28.8/56kbps) Router (T1 - 1.544Mbps) Internet Router (Frame Relay: 256kbps) Local Area Network

2. 7.1WWW operation HTML/Java WWW server WWW browser HTTP protocol WWW browser HTTP TCP IP HTTP protocol HTML/Java WWW page Presentation Session Transport Network Internet (TCP/IP)

3. 7.2WWW Topology Germany Japan UK USA France User Links to other Web servers Sweden Canada Hyper Text Language Hyper Text Language Hyper Text Language Hyper Text Language Hyper Text Language Hyper Text Language Hyper Text Language

4. 7.3Advantages/Disadvantages of the WWW Global information flow Less control of information by the media, governments and large organisations.  Lack of control on criminal material, such as certain types of pornography and terrorist activity. Global information flow Less control of information by the media, governments and large organisations.  Lack of control on criminal material, such as certain types of pornography and terrorist activity. Global transmission Communication between people and organisations in different countries which should create the Global Village.  Data can easily get lost or state secrets can be easily transmitted over the world. Global transmission Communication between people and organisations in different countries which should create the Global Village.  Data can easily get lost or state secrets can be easily transmitted over the world. Internet connections Many different types of connections are possible, such as dial-up facilities (perhaps over a modem or with ISDN) or through frame relays. The user only has to pay for the service and the local connection.  Data once on the Internet is relatively easy to tap into and possibly easy to change. Internet connections Many different types of connections are possible, such as dial-up facilities (perhaps over a modem or with ISDN) or through frame relays. The user only has to pay for the service and the local connection.  Data once on the Internet is relatively easy to tap into and possibly easy to change. Global information Creation of an ever-increasing global information database.  Data is relatively easy to tap into and possibly easy to change. Global information Creation of an ever-increasing global information database.  Data is relatively easy to tap into and possibly easy to change. Increasing WWW usage Helps to improve its chances of acceptance into the home.  Increased traffic swamps the global information network and slows down commercial traffic. Increasing WWW usage Helps to improve its chances of acceptance into the home.  Increased traffic swamps the global information network and slows down commercial traffic. Multimedia integration Tailor-made applications with good presentation tools.  Lack of editorial control leads to inferior material, which is hacked together. Multimedia integration Tailor-made applications with good presentation tools.  Lack of editorial control leads to inferior material, which is hacked together. WWW links Easy to set up and leads users from one place to the next in a logical manner.  WWW links often fossilise where the link information is out-of-date or doesn’t even exist. WWW links Easy to set up and leads users from one place to the next in a logical manner.  WWW links often fossilise where the link information is out-of-date or doesn’t even exist. Education Increased usage of remote teaching with full multimedia education.  Increase in surface learning and lack of deep research. It may lead to an increase in time-wasting (too much surfing and too little learning). Education Increased usage of remote teaching with full multimedia education.  Increase in surface learning and lack of deep research. It may lead to an increase in time-wasting (too much surfing and too little learning).

5. 7.4Example Connections to the Internet Internet Service Provider (ISP) E.g. AOL, Freeserve Internet Service Provider (ISP) E.g. AOL, Freeserve ISDN (64kbps/128kbps) Modem (28.8/56kbps) Router (T1 - 1.544Mbps) Internet Router (Frame Relay: 256kbps) Local Area Network

6. 7.5URLs + http (hypertext transmission protocol) aaaa:bbb.bbb.bbb/ccc/ccc/ccc?dddd + ftp (file transfer protocol) + https (secure hypertext transmission protocol) + mailto (mail to) + telnet (remote login program) + news (news server) + Server name (e.g www.intel.com) + File path name + Additional Examples mailto:fred.bloggs.co.uk http://www.intel.com/search/index.html ftp://anonymous:none@www.co.uk/src/info.txt telnet://fred:pword@www.dcs.napier.ac.uk/ Examples mailto:fred.bloggs.co.uk http://www.intel.com/search/index.html ftp://anonymous:none@www.co.uk/src/info.txt telnet://fred:pword@www.dcs.napier.ac.uk/

7. 7.6WWW browser design RefreshHomeSearchFavs.HistoryBackForward History Stop