© folens 2008 transfer of data in ict systems using ict networks
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Transfer of data in ICT systems
Using ICT networks
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Basic elements of an ICT network
There are four basic elements of an ICT network.These are:• communication devices• network software• data transfer media• network standards and procedures
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Communication devicesA network interface card:• prepares data for sending
over the network• sends the data• controls the flow of data
from the computer terminal to the transmission medium
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Communication devicesA hub:• is used to join computers in
a network• allows the connection of
cables• allows the sharing of files
and Internet access
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Communication devicesA switch:• is a similar device to a hub
but more intelligent• can look at a packet of data
to decide where it should go• reduces the number of
packets of data on a network, which speeds the network up
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Communication devicesA router:• can be wired or wireless• is used to join several
networks together• is often used to connect
several computers in the home to the Internet
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Networking softwareNetwork software consists of:• network operating systems – specialist operating
systems designed specifically for networks• network management software – used to help a network
manager run a network by keeping track of software, keeping software up-to-date, installing software security patches, helping to manage the help-desk, etc.
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Data transmission medium
The medium/method bywhich the data is transmitted in a network can be:• metal wire• fibre optic cable• wireless
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Standards and protocols
• communication software manages the flow of data across the medium
• it also establishes certain rules, called protocols, by which computers can communicate
• standards are needed so that all network devices work in a similar way