Internet

Internet

1. A worldwide collection of computer networks

2. An infrastructure

3. Usually confused with the World Wide Web. IT'S NOT THAT!!!

   • The WWW is a collection of pages hosted on the Internet

4. A facillity for sending data between computers

5. A network of networks

   • Worldwide

6. Uses standard protocols such as TCP/IP

7. Can be used for email, file sharing, telephone conversations as well as looking at web pages

8. Hardware needed to connect to the internet

   • Modem
     • Short for modulator/demodulator
     • Translates the digital signal from computer into analogue so it can go along the telephone system
   • Router
     • Large networks connect to digital transission media using routers
     • A router decides where a data packet should go
       • Uses a conficuration table that contains information about devices on a network
     • Useful for joinng two networks
     • The internet relies on routers to ensure data packets delivered by the most efficient routs available

9. IP addressing

   • Made of four 8-bit numbers
   • Routers use IP addressing to direct the data to the right place
   • IP addresses are given to all web sites
     • The IP address is converted to a domain name so the user can remember it more easily
       • E.G: bbc.co.uk
       • DNS = Domain name services
         • Translate the domain names into IP addresses