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networks presentation

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by

natasha mafanda

on 1 October 2012

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Transcript of networks presentation

Spark (cc) image by nuonsolarteam on Flickr what is a network
Two very common types of networks include:
•Local Area Network (LAN)
•Wide Area Network (WAN) A network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams. networks what is a stand alone computer A 'standalone computer' is the one which is not linked with the network. It can't be connected with the internet or LAN or WAN. A standalone computer simply means that it can't receive or transfer information to other computers. Also, you can't browse or check e-mail in a standalone computer. network benifits and drawbacks what is a network
benifits

A user can logon to a computer anywhere on the network and access their work files from the file server
Computers can be managed centrally - with the same software installed on each one
Security - the Network Manager can allocate usernames and passwords to all users to try to prevent unauthorised access
Time - it is much faster to install an application once on a network - and copy it across the network to every workstation
Sharing printers, plotters, modems etc saves money and time
I is easy and convenient to monitor users - for example websites visited or documents printed - this can be done using software running on the server drawbacks

Users may use too much bandwidth - for example when listening to music files or watching video clips - preventing others from using the network facilities properly
Users may use up too much of the storage space and this may cause problems on the network
It can be frustrating to print to a printer in another room - and then find after a long trek - that there is no paper in the printer!
It would take a long time to install software applications on each computer - one at a time!
The technical skills needed to manage a network are much higher than working on a stand-alone computer
If something goes wrong with the file server the whole network is unable to operate benifits

Fewer Hardware requirements. No extra cabling or equipment needed. Just a PC!
Reliability and Performance. Not effected by network traffic. Performance should stay relatively the same.
Security. A virus would not effect other machines (hmm!) Hackers etc would have to be on the actual machine. The machine can be locked away!
Little ICT Knowledge Required. No complex understanding of networks etc is required for a stand alone system drawbacks

Harder to communicate. No real electronic means to communicate (unless they all had a separate connection to the internet – again, costly!)
Individual Backups. Each person would be responsible for backing up data on their machine. Imagine the duplication of data in a business!!!
Software installed on every machine. Costly and Timely!
No hardware sharing. You would have to switch to different machines (taking your data with you), to use different hardware (e.g. if a scanner was on another computer). What is a LAN?

A local area network (LAN) supplies networking capability to a group of computers in close proximity to each other such as in an office building, a school, or a home. A LAN is useful for sharing resources like files, printers, games or other applications. A LAN in turn often connects to other LANs, and to the Internet or other WAN.

Local Area Network. A series of interconnected computers restricted to one site.
Usually connected and based with various types of cables and wireless technologies. the lan machines are linked together using a crossover cable What is a WAN?

A Wide Area Network (WAN) is a network that covers a broad area (i.e., any network that links across metropolitan, regional, or national boundaries). The Internet is the most popular WAN, and is used by businesses, governments, non-profit organizations, individual consumers, artists, entertainers, and numerous others for almost any purpose imaginable.

Wide Area Network. A series of interconnected computers over more than one physical site (area, town, city or even country!)

Connected with a range of technologies such as phone lines, satellite links, broadband, physical fibre optic link. Each computer connected to a central server.
Server is a high specification PC.
Everything goes through the central server.
Huge dependence on central server.

+ Central Backup
+ Network stays active if one line breaks.
+ Easy to expand
+ Fewer security problems due to central control.
+ High performance. Each client has its own cable. star topology All connected to one closed loop.
No main computer
Communication happens by passing data
around the ring.
All data passes through all computers.
Security problem!
To add a new client, the whole network must be switched off.
Backup issues
A break in the line causes whole network failure.

+ Very fast transmission rates.
+ Not dependant on single server
+ Cheap to install (no server, no major cabling). ring topology Cheap to install. Only one cable needed.
Straightforward and easy to install.
Extra computers can be added easily.
No central server.
Data sent to every machine (security issues).
Backup issues.
Network down if main cable is damaged.

+ Fast transmission.
+ Easy to set up and install
+ New clients can be added easily. bus topology The End by natasha mafanda
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