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8 Cards in this Set
- Front
- Back
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Factors which influence choice of network
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1.Cost of network- Initial purchasing of equipment -Installation and training -Maintenance/ Personnel costs 2.Size of organisation- Needs can range from a small LAN to a global WAN -Some communications media are limited by the distance they have to travel 3.How the system will be used- What type of applications do users require? - Will they need large data storage? 4. Existing systems to integrate- Any network must fit in with the existing operating systems and protocols -It must support any peripherals already in use e.g. bar code readers, printers ,etc.
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Client vs Peer to Peer
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What is a network topology?
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Physical configuration of layout of network and how it is linked/connected together
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Star topology
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Advantages: -Fault tolerant, if one cable fails then the other computers can still be used. -Easy to add extra computers- extra computers can be added without disturbing the network -Different speeds are possible on different spokes/arms of the network Disadvantages: -Higher cost, the larger amount of cabling needed makes it more expensive -Dependence on the central server/hub |
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Ring topology
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Advantages: -Each computer has the same access as the others so no one computer can hog the network -Higher transmission speeds, data flows in on direction only (so large volumes can be transmitted) -No collisions Disadvantages: -Faults are difficult to locate -Break in the cable and the network won't work |
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Advantages & Disadvantages of WiFi
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Advantages: -Allows inexpensive LANs to be set up without cables -Allows people the freedom of working anywhere a signal can be received -Ideal for networks in old listed buildings where cables would not be allowed to be installed -Global set of standards. you can use WiFi all over the world Disadvantages: -There may be security problems even when encryption is used -Transmission speed slower than cable -There may be health problems in using WiFi |
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Remote management
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-Send instant messages -Clear printer queues (at stations) -Shut down stations -Log off users who have forgotten to do so -Check to see right number of licences -Setting regular times for virus scanning/ checking virus scanning has been done |
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User accounts & logs
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-Allows the manager or system to manage accounts by ALLOCATING of access levels to users -Auditing is used to identify abuses of the system by authorised staff -Auditing investigates instances of unauthorised access (i.e. by hackers) |
