Networks

Networks

1. Choosing a network for a company ?

   • How will the system will be used ? What type of applications do useres require and where does the proceessing get done
   • Size of the organstion Needs Can range from a small LAN to a global wan.Some communcations media are limted by the distance they have to travel
   • Existing systems to intergate More often networks are not devolped from scratch but need to fit in with existing networks
   • Performance in terms of reliability diifernt parts of the organztion may have diifernt performance rquirements

2. Diffrences Between Peer To Peer and Client server

   • Peer To Peer COst saving no server is needed so all the computers can be the same.Low operating costs less set up and maintince osts. Status all machines have the same status and rights .
   • Client Server More expensive as servers are expsenive to buy.The cost of set up and maintence is higher. One manchines is more important tha the rest.

3. Toplogies

   • Ring
     • Advantages Of ring Eaach computer has the same access sa the others so no one computer can hog the netwokr.Also No collions
     • Disadvantges Of ring Faults are diffcult to locate If a brethere is aak in the cable the network wont work
   • Star
     • Advantges of star Fault tlerant if one of the cable fails then other computers can still be used
     • Disadvantges of star Higher cost large amount of cabiling Depenedce on the central server

4. Wifi

   • Advantges 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 Wi-Fi all over the world can use a variety of devices such as tablets, mobile phones, etc
   • Disadva6tnges power consumption is high – which means laptops soon exhaust their rechargeable batteries there may be health problems in using Wi-Fi there may be security problems even when encryption is used Wi-Fi networks have a very limited range (e.g. 150 ft) can get interference if wireless network signals start to overlap