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Bridge


A bridge is a device, which connects two local area networks. The two local area networks are linked so the network can be more powerful. If a file server uses this, then it can use it for its own needs. This enables it to be used at a great rate.


A fibre optic cable is need so the data is sent easily. Although a metal wire can be used, it can also create a problem.


A bridge can be linked to a file server, which can be more than hundred metres apart. The downside is that if the data signal is too far, then the signal begins to break up. So the signal has to be regenerated by a repeater.


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E-mail


E-mail means electronic mail. An e-mail sends transmits messages over the network. An email can send messages typed through keyboards or they can also send attachments of files. E-mail systems can sometimes are just configured to just one computer. Usually the computers have gateways, which are linked to other computers that means they can send e-mails worldwide. Large organisations and companies use e-mails. Also friends and families use e-mails so they can contact friends and families from one side of the world to the other side.


There are many e-mail services. Most of them allow you to edit your e-mail layout by adding emocitions, which are smiley faces and objects. Also the editor allows you to change the style, size and colour of the font.


E-mails are very secure and reliable. Most services allow up MB of storage but more can be purchased. Also e-mails allow you to get rid of Spam. Spam is e-mail sent to the e-mail users by people advertising junk etc. E-mail services allow you to block Spam mails.


Also e-mails allow you to create folders so that you can put your e-mail in the specified places you want to.


Advantages and disadvantages of a standalone computer to a LAN and the Internet


Advantages of a LAN


§ With a standalone computer you can share printers.


§ Users can log onto any workstation and logo on to their user account


§ The data that is stored goes centrally to the network, which enables users to access it


§ With a LAN it is much cheaper because, the resources can be shared. So this means that the printer can be shared and only one will be needed.


Disadvantages of a LAN


§ If there is no LAN then that means that if the network is down, then none of the users can access their work and personal files.


§ It will be very easy for hackers to take over the system


§ If one of the workstations get a virus this will mean that all the rest will catch the virus too


§ The workstations would run slower than the faster rate a LAN would give them. This is because all the workstations will be connected to one network and also share the Hub.


Advantages of the Internet


§ With an internet you can make searches on online databases


§ The users can check your e-mail


§ The users can check for information that is needed from certain websites


§ The users can check all the weather, news etc


Disadvantages of the Internet


§ Any hacker can take over your computer, while you may be going on a certain website


§ The internet connection can cost a lot


Conferencing


There are many types of conferencing, such as audio conferencing, audio graphic teleconferencing, computer conferencing, teleconferencing and video conferencing.


Audio conferencing


Audio conferencing is when there is use of sound whilst communication between people.


Audio graphic conferencing


An audio graphic conferencing is where voice connection and an electronic white board are both used so people can communicate.


Teleconferencing


The “tele” means long distance. Teleconferencing is when there is interactive communication between many people at different places. This can include data, video or even audio conferencing.


Computer conferencing


This is when there is communications amongst people at different places. The communication can be done by text or graphics. The information is sent through interconnected computers.


Video conferencing


This is very similar to teleconferencing, but here the pictures are sent, which do not move but sound and text can be sent with the picture. Video conferencing was first introduced by analog TV’s, which gradually got adapted by digital video systems and then computer networks.


Bulletin boards


Bulletin boards are basically just like physical bulletin boards, but instead they are computerized. On the boards people can leave messages, adverts. Computer groups normally use them. The computer groups use them so they can let people download stuff they need to. Many web pages also have bulletin boards.


This is the bulletin board for the Beauchamp college website.


Online Database


An online database is where you can search virtually anything. This screen shot is of the yahoo online database. On this online database you can search by putting in what ever you want to search in the search box. Then you click search.





E.g. I have put in “Manchester United”. So when I click search it would give me a search results.





Here is a screen shot, which show the search results of the online database.


Online databases are very good because you can find out many things you really need to know, such as the weather, sport, news etc.


File transfer


A file transfer is where a file or files are moved from one place or another. A large amount of electronically stored files can be placed to another area by moving the hard disk, diskette or compact disk. This can also be done by sending the files over a telecommunication medium.


The Internet is a common way to send a file or more files from one computer to another computer. If you want to send a file with a large amount of data, then you can compress a file. A zip file is normally used for this sort use.


This screen shot shows an example of a file transfer





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