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Computing Cg1

By | March 2013
Page 1 of 5
Protocols
networks consist of hardware/software that work together to exchange info. Only possible if agreed rules/procedures governing communication are in place , these are called protocols HTTP (Hyper Text Transfer Protocol) Stand method of transferring data between web server and browser FTP (File Transfer Protocol)- allows files to be transferred across the internet WAP (wireless application protocol) – open international standard for app layer network communications. Mainly to enable access to internet from mobile or PDA. SMTP (simple mail transfer protocol) – for sending e-mail between servers & computers POP3 (post office protocol) - downloads email from server to computer VoIP ( voice over ip) – allows internet to be used as phone HTTPS (secure HTTP) identical to http but signals browser to use added encryption4 IrDA ( infrared) – short range communicating by infrared light Bluetooth - wireless technology, allows phones computers and devices to talk over short distances up to 100 meters

Hardware and communications

Connecting portable devices
portable devices useful at home, working, meetings or travelling. Can connect to network or sync to a host computer e.g microsoft activesync for windows mobile device. Personal digital assistant (PDA) – Calculation, clock, calendar, address book, internet, emails, photos video recording, word processing, bar codes, radio/music player, games, GPS, can be connected to wireless network via wireless network connection. Other devices can also be connected by USB. Wi-fi replaces wired lans, allows you to move freely. Check emails everywhere. Places offer wi-fi airports, coffee shops, centers of education etc

Benefits of wireless
lack of cables allows networks in places it couldnt before e.g historic buildings, public areas, outdoors, on the road
Wireless security
having wirless connect means should protect data etc techniques include : WEP –...
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