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AQA Comp 3 Networks

Communication methods, networks, server-side scripting and internet security.

TermDefinition
Data transmission Movement of data from one place to another
Serial data transmission Single bits are sent one after another along a single wire
Parallel data transmission Bits are sent simultaneously down several wires
Baud rate The rate at which signals on a wire or line may change
Bit rate The number of bits transmitted per second
Bandwidth The range of signal frequencies that can be transmitted over a particular medium
Asynchronous serial data transmission The arrival of data cannot be predicted by the reciever, so a start bit is used to synchronise the transmitter and reciever temporarily
Commication protocol A set of pre-agreed signals, codes and rules to be used for data and information exchange between computers and/or peripherals
Handshaking protocol The sending and recieving devices exchange signals to establish that the recieving device is connected and ready to recieve, then co-ordinate the sending, and finally that the reciever is ready to recieve again
Baseband system A system that uses a single data channel in which the whole bandwidth of the transmission medium is dedicated to one data channel at a time
Broadband system A multiple data channel system in which the bandwidth of the transmission medium carries several data streams at the same time
Local area network (LAN) Linked computers in close proximity
Stand-alone computer A computer that is not networked
Topology The shape, layout, confiuguration or structure of the connections that connect devices to the network
Wide area network (WAN) A set of links that connect geographically remote computers and local area networks
Internet A collection of LANs and computers that are interconnected by a WAN
Network segment A portion of a computer network, where all devices are connected
Thin-client network A network where all processing takes place in a central server; the clients are dumb terminals with little or no processing power or local hard disk storage
Thick-client (rich client) network A network where the applications are run in the client workstations, which have local processing power
Peer-to-peer network A network that has no dedicated servers, meaning all computers (peers) are equal
Client A computer that uses the services provided by a server
Server A computer that provides shared resources to network users
Server-based network A network in which resources, security, administration and other functions are provided by dedicated servers
Web 2.0 Software that becomes a service accessed over the internet
Web services Self-contained, modular applications that can be described, published, located and invoked over a network, generally the internet
Software as a service (SaaS) A model of software deployment where an application is hosted as a service and provided to customers across the internet
Web services architecture All components in the system are services
Ajax A web technology that allows only the part of a web page that needs updating to be fetched from the web server
Wireless network Any type of LAN in which the nodes are not connected by wires but use radio waves to transmit between them
Wi-Fi Trademarked IEEE 802.11 technologies that support wireless networking of home and business networks
Bluetooth A wireless protocol for exchanging data over short distances from fixed and mobile devices
Router A device that recieves packets or datagrams from one host or router and passes them, correctly formatted, to another host or router
Gateway A device used to connect networks using different protocols so that information can be passed from one system to another
Web server extension A program written in native code that is interpreted by an interpreter running on the web server, that extends the functionality of the web server and allows it to generate content at the time of the HTTP request
Common gateway interface A gateway between a web server and a web server extension that tells the server how to send information to a web server extension, and what it should do after recieving information in return
Dynamic web page content Conten that is generated when the web browser request is recieved
Virus A small program attached to another program or file, which replicates itself by attaching itself to other programs, and usually attacking the computer
Spam Unsolicited junk emails
Created by: 1482536663
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