-
1.
Fisher
comparing
the
following
three
data
communication
systems.
local
area networks.
A
local
area
network
is
a
network
that
connects
computers
within
a
limited
geographical
area,
usually
within
a
single
office
or
building.
These
are
the
most
common
types
of
network
and
are
connected
using
direct
cables.
They
do
not
require
modems
to
connect
through
the
telephone system like
wide area networks do and each time the company
expends it must expand the network.
?
LANs link
computers within a single building or on one
site.
?
LANs can be linked to other
LANs.
?
LANs cannot span large
distances.
?
One
of
the
most
popular
LAN
systems
used
is
the
Ethernet
system
developed by Xerox
Corporation.
?
LANs are under the control of a single
authority.
Wide
Area Networks.
Wide area networks,
unlike LANs, cover large geographical areas.
An example would be
organizations based in different parts
of a city, a
different country or
anywhere in the world.
?
Used to
communicate across wide distance.
?
Uses the
telephone lines to communicate through a modem.
?
Is run by
several national organizations, unlike LANs.
?
Connection is
normally through the services of
service provider, for
example
BT,
One-Tel,
Tiscali.
These
are
just
a
few
of
the
many
service providers
available.
The
Internet
An Internet is a
global network made up of a number of smaller
systems.
It
has
been
estimated
that
it
comprises
approximately
2.5million
individual network systems throughout
the world.
The internet is world and
can be accessed from any location throughout
the
world.
Sending
emails to people
across the
world is almost
as
easy
and quick
as speaking to someone standing next to you.
2.1
How
the
three
data
communication
systems
would
benefit
ICT.
LAN
LAN make permits ICT to share resources
such as printers and LAN also
could
make ICT allows users to easily share files and
make permits quick
and easy
communication with staff.
WAN
it
could
permits
ICT
to
trade
in
a
virtual
manner
and
overcomes
ICT
’
s