Networks
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- Created by: Mandy7367
- Created on: 03-06-18 18:56
Factors to Consider When Choosing a Network (1/5)
Cost of the Network
- Initial purchasing of equitment.
- Installation, training and maintenance.
- Size of avaliable budget - determines what can be done (E.g. fibre optic cables are faster, but more expensive.
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Factors to Consider When Choosing a Network (2/5)
Size of Organisation - NOT 'Size of Network'
- Needs can range from a small LAN to a global WAN.
- Some communication medias are limited by the distance they can travel.
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Factors to Consider When Choosing a Network (3/5)
How the System will be Used?
- What type of applications will the users require? Are the users going to require a wide range of applications?
- Will they need a large amount of data storage? Are the users going to store a large number of data files?
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Factors to Consider When Choosing a Network (4/5)
Existing Systems to Integrate
- Networks are not always developed from scratch.
- It is important that they support any peripherols already in use (E.g. bar code readers, printers, etc.).
- Sometimes an extension is required (e.g. when a new branch office opens).
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Factors to Consider When Choosing a Network (5/5)
Performance in Terms of Speed of Processing
- Different parts of the organisation may require different perfromance requirements.
- E.g. A real time e-commerce system may require greater speeds than an in-house payroll system.
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Network Topology (1/4)
What is meant by the term Network Topology?
It's the physical configuration/shape of a network, which shows how everything is linked/connected together.
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Network Topology (2/4)
Ring
Advantages of Ring
- Network not dependant on central computer.
- Each computer has the same access as the others, so no one computer can hog the network.
- Higher transmission speeds (flows in one direction only), so no data collisions.
Disadvantages of Ring
- If there's a break in the connection, then the whole network fails.
- Fault Intolerant - faults are difficult to locate
- Impossible to keep network running whilst equitment is added/removed, because there is only one path for the data to follow.
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Network Topology (3/4)
Bus
Advantages of Bus
- Cost effective option because of the small amout of cables needed.
- Simple cabling makes it easy to install.
- Extra devices can be attached easily to the network.
Disadvantages of Bus
- Load Intolerant - if more than 12 devices are added then the performance of the network is degraded.
- If there is a fault/break in the main backbone, the network cannot be used.
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Network Topology (4/4)
Star
Advantages of Star
- Fault Tolerant - if one of the cables fail, then the other computers can still be used.
- Load Tolerant - extra computers can be added without much loss in performance. This is because all computers have their own independant path to the server.
- Different speeds are possible on different arms of the network.
Disadvantages of Star
- Higher costs due to large amount of cabling needed.
- Very dependant on the central server.
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Remote Management
Run by network manager, who can:
- See which users are using the network.
- Check on which sites employees visit on the network.
- Check what hardware needs upgrading.
- Log off users, if they have forgotten to do so themselves.
- Shut down/control stations.
- Clear printer queues at stations.
NOT - Manage Passwords/Delete Passwords
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Peer2Peer v Client Server (1/2)
Peer2Peer
Advantages of Peer2Peer
- Cost saving, since no central server is needed.
- No network manager is needed. All users take responsibility for the network.
- Easy to setup. they are the simplest of the computer networks, so can be set up by anyone.
Disadvantages of Peer2Peer
- Backups can not be made centrally. This places the responsibility on all the users to back up their own data, which you cannot be sure all users will.
- Users need more IT knowledge, as they are responsible for their own files.
- Users may experience difficulty in finding files as they are not organised or held centrally.
- Only suitable for a network or less that 15 computers.
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Peer2Peer v Client Server (2/2)
Client Server
Advantages of Client Server
- Load Tolerant - for larger networks, extra computers can be added without the loss of performance.
- Better security because everything is centralised and one person is responsible for this.
- Backups are centralised. They take place regularly, which means data and programs are less likley to be lost.
Disadvantages of Client Server
- More expensive becase servers are expensive.
- Need someone who has specialist expert IT knowledge and understands the technicalities of the network.
- Software is more sophisticated and expensive.
- For larger client server networks, it is necessary to buy network management software.
- If the server breaks down it renders the whole network unusable until it is repaired.
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