Slides in this set

Slide 1

Preview of page 1

19 Computer networks
A computer network is a collection of computers linked
together so that they can communicate with each other.
A computer that is not connected to a network is called a
stand-alone computer.
There are two different types of computer network:
Local Area Network or LAN - the computers are all in the
same building or in different buildings on one site
permanently connected to each other with special cables.
Wide Area Network or WAN - the computers are spread
over a large geographical area not permanently connected to
each other communicate using telephone lines, radio
transmitters or satellite links.
GCSE ICT 3rd Edition
GCSE ICT 3rd Edition…read more

Slide 2

Preview of page 2

19 Computer networks
Local Area Network
GCSE ICT 3rd Edition
GCSE ICT 3rd Edition…read more

Slide 3

Preview of page 3

19 Computer networks
Wide Area Network
GCSE ICT 3rd Edition
GCSE ICT 3rd Edition…read more

Slide 4

Preview of page 4

19 Computer networks
Network security measures are needed to protect
programs and data from the threats that come from other
users and hackers.
Data can be kept secure by:
giving each network user their own user identity and
password;
reducing unauthorised access by allowing users different
levels of access;
physically restricting access to computer rooms by locking
doors or providing users with entry codes or special swipe
card keys.
GCSE ICT 3rd Edition
GCSE ICT 3rd Edition…read more

Slide 5

Preview of page 5

19 Computer networks
The topology of a network describes the way cables are
used to connect network devices like servers, workstations
or printers.
In a bus topology all the computers are connected through
their own cable to a single central cable - this is the
simplest type of topology.
GCSE ICT 3rd Edition
GCSE ICT 3rd Edition…read more

Slide 6

Preview of page 6

19 Computer networks
In a ring topology computers are connected to each other
forming a large circle.
Data is sent around the ring until it reaches its final
destination.
A problem with this topology is that if one computer fails
the entire network will break down this is one reason why
ring topologies are not used much anymore.
GCSE ICT 3rd Edition
GCSE ICT 3rd Edition…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Comments

No comments have yet been made

Similar ICT resources:

See all ICT resources »