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a network is a group of computers linked together. it
consists of at least two computers joined by cables
on the same desk or same office, but it can also
mean thousands of computers across the world. the
users of a network can share hardware (scanner,
printer, fax machine, access data in other
people's computers and run other programs stored in
the network although not installed on their own
computer.
a network consists of:
• nodes, that is to say different computers and
devices;
• a connecting medium, such as cables or a wireless
connection;
• routers, which are specia l computers enabled to
send messages;
• switches, that is to say devices which help to
select a specific path to follow.
networks can be connected in different ways
according to the area they cover.
a lan (local area network) is generally located in a
limited space, such as a building or a campus.
on the contrary, a wan (wide area network)
operates in a larger area and it can reach most of the
world, so it could be described as a collection of
lans all over the world.
the exchange of information in a network is
controlled by communications protocols, which
define the formats and rules that computers must
follow when talking to one another.
well-known communications protocols are ethernet,
which is a family of protocols used in lans, and the
internet protocol suite, which is used in any
computer network.
computer networks offer many advantages. for
example, they fa cilitate communication , al lowing
people to send emails and texts, make phone/video
calls and videoconference. furthermore, networks
allow people to share files, data, and other types of
information as users may access data and information
stored on other computers in the network.
on the other hand , networks may be difficult to set
up and may be insecure as computer hackers can
send viruses or computer worms to the net computer.
they may also interfere with other technologies, as
power line communication strongly disturbs certain
forms of radio communication and access technology
such as adsl.
1 what does a network consist of?
2 what is a router?
3 what is a lan?
4 what is a wan?
5 what is the function of communications protocols?
6 what is ethernet used for?
7 what are the advantages of usi ng a network?
8 what are the disadvantages of using a network?

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razi2008900

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