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Slide 1

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Local Area Network (LAN) ­ network in a small
geographical area (e.g. Within a building)
Wide Area Network (WAN) ­ network over a large
geographical area (e.g. Several sites in a country or across
the world)…read more

Slide 2

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Factors that will influence
choice of network
·Cost of network
·Size of organisation
·How system will be used
·Existing systems
·Performance required
·Security issues…read more

Slide 3

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Measures of network
·Cost…read more

Slide 4

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Costs associated with a
·Staffing costs
·Network maintenance costs (upgrades,
adding terminals)
·Hardware costs (cables, routers)
·Training costs
·Cost of third party communication lines (BT,
·Software costs (network operating systems,
network management software)…read more

Slide 5

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Types of networks
·Client-server ­ network where several
Client Client
computers are connected to one or more
servers. Usually a more powerful computer
Client Client is used as the central computer because
computers in client-server network are not
the same status.
Client - Server network
·Peer-to-peer (P2P) ­ network where each computer
is of equal status.
Peer-to-peer network…read more

Slide 6

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·Advantages ·Disadvantages
·Better security ­ because centralised & ·More expensive ­ servers are more
only one person responsible for it. expensive.
·Centralised data ­ data all held on file ·Need specialist knowledge ­ need person
server so all users have access to same who understands technicalities of network
set of data. in charge of network.
·Back-ups taken centrally ­ regular ·Software is sophisticated and expensive ­
backups taken by network manager so data network operating systems are expensive.
and programs less likely to be lost. Larger client-server networks it may be
necessary to buy network management
·Faster access to programs and files ­ software.
servers used, which is a powerful computer
so whole network runs faster. ·If server breaks down ­ renders network
unusable until it can be repaired.
·Centralised administration ­ all
administration of network (e.g. Allocation of
usernames and passwords, help etc)
performed centrally so users don't have to
worry about it.…read more

Slide 7

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Slide 9

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Slide 10

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A useful summary of key points for the topic

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