Communication

Communication, Network and Internet:

Internet terms

**TCP/IP -** The internet protocol suite the communication protocols that can be used in internets and other networks. **World wide web -** A wide network with lots of files for people to access throughout the world. **Hypertext -** Something that allows you to access similar information that is the text on the screen. **Hypermedia -** An extension of hypertext, allow multimedia facilities such as videos, sound ... **Hyperlink -** A link from a word or phrase from hypertext to another file of a different location, usually seen as a blue underlined text on a piece of text. **Web server -** A computer program that delivers HTTP files, Hypertext Transfer Protocol from one place to another. **Client -** A computer able to obtain applications or informations from a different computer. **Cyberspace -** A place where computer communicate, such as the internet. **Web browser -** An applications that allows the computer to use the internet and connect to different HTTP files. **IP address -** Internet protocol, a address that is for your computer, basically a passport for your computer, the name of your computer that is seen on the internet. **Static address -** Placing a permanent IP address to a system. **Dynamic address -** A IP address given by the internet service provider to know who you are. **Web address -** An address so that other computers can locate your file/data that you have uploaded up in the internet. **URL -** Uniform resource locator, the address on the web page. **Surfing -** Moving from site to site in the internet. **.com -** top level domain commerce **.co.uk -** top level domain commerce based in uk **.ac.uk -** academic uk  **.org.uk -** organization uk  **.html -** hypertext markup language **.htm -** Hand to mouth **Directory service -** Network identify service, responds the users to find the web page. **Search engine -** Something that defines the webpages, so you can find the files in the net much simpler and faster. **Spider -** A program that is used to automatically fetch web pages **Web bot -** Runs automated tasks in the web. **HTTP -** Hypertext Transfer Protocol

Network


 * Joining up the hardware’s so that they can send files to one another.
 * Cheaper so you don’t need a printer for everyone in a school.
 * LAN (Local area network)
 * o Easy to share files
 * o Easy to back up
 * o There is a file server which links up all computer
 * o Only for people who can see the network, limited range (short range)
 * Wan (Wide are network)
 * o Companies have their factories, offices all over the world; to link them together they need a Wan.
 * o Wan is to connect the LANs together and creating a bigger network.
 * Bus
 * o A simple way of getting the workshops, scanners together in a network.
 * o If the bus fails will cause the network to disconnected.
 * o Data collision can happen when the bus is too busy
 * o Low security as everyone in the network can see each other’s work
 * Ring
 * o Computers are connected in a ring passing from 1 computer to another till the data is reached to the destination computer
 * o 1 way travel so it is simple
 * o No collision
 * o Computer can be added into this network any time
 * o If a computer is switched off then this network is disconnected
 * o As data travel from 1 computer to another, meaning it would be slow
 * o If there is a problem hard to identify
 * Star
 * o The best network layout as each computer is connected to the hub directly.
 * o Hard to set up
 * o Experts are needed
 * o Extra hardware is needed
 * Broadband
 * o Data transmission using ADSL
 * o Uses telephone line to send data
 * o Usually using communication satellites