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October/November 2011<br />Scenario 3<br />Question 7 and 8(a)<br />
Scenario<br />A passport office has an intranet to enable internal communications.<br />They also have a website where cus...
Question 7 (a)<br />A passport office has an intranet to enable internal communications.<br />They also have a website whe...
Answers Question 7 (a)<br />
Question 7 (b)<br />The data transferred is sometimes subject to corruption and must be checked.<br /> One method which is...
Answers Question 7 (b)<br />Any five points from:<br />- verifies data transmitted accurately/correctly<br />- parity can ...
Question 8 (a)<br />The passport office has invested in the latest technology to allow reliable customer services and ensu...
Answers Question 8 (a) #1<br />Any seven points from:<br />Ring:<br />- drawing/description of ring topology<br />- advant...
Answers Question 8 (a) #2<br />Bus:<br />- drawing/description of bus topology including terminator<br />- advantages:<br ...
Answers Question 8 (a) #3<br />Star:<br />- drawing/description of star topology<br />- advantages:<br />- if one device f...
Answers Question 8 (a) #4<br />Tree:<br />- drawing/description of tree topology:<br />- advantages:<br />- brings togethe...
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October november 2010 scenario 3 question 7,8(a)

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Transcript of "October november 2010 scenario 3 question 7,8(a)"

  1. 1. October/November 2011<br />Scenario 3<br />Question 7 and 8(a)<br />
  2. 2. Scenario<br />A passport office has an intranet to enable internal communications.<br />They also have a website where customers can get information and also fill out forms (e.g. passport applications). <br />The intranet links into the website. <br />The data transferred is sometimes subject to corruption and must be checked.<br /> One method which is used by the passport office is parity checking.<br />The passport office has invested in the latest technology to allow reliable customer services and ensure good network security.<br />
  3. 3. Question 7 (a)<br />A passport office has an intranet to enable internal communications.<br />They also have a website where customers can get information and also fill out forms (e.g. passport applications). <br />The intranet links into the website. <br />Customers can access information over the internet which involves the transfer of data to and from a central server.<br />(a) Describe the network protocols needed to transfer data in this situation. Your answer should include references to types of protocol, communication layers and give examples. [8]<br />
  4. 4. Answers Question 7 (a)<br />
  5. 5. Question 7 (b)<br />The data transferred is sometimes subject to corruption and must be checked.<br /> One method which is used by the passport office is parity checking.<br />The passport office has invested in the latest technology to allow reliable customer services and ensure good network security.<br />Describe the process of parity checking.[5]<br />
  6. 6. Answers Question 7 (b)<br />Any five points from:<br />- verifies data transmitted accurately/correctly<br />- parity can be even or odd according to number of 1 – bits<br />- first bit of a byte is parity bit; next 7 are packet of data<br />- e.g. 1 0 1 1 0 1 0 0 needed a 1-bit to give even parity 0 1 1 1 0 1 0 0 only needed a 0 since already even parity<br />- if packet arrives at destination and parity doesn’t match up then an error in transmission has occurred<br />- if more than one bit has been changed or bits transposed, parity check may not pick up transmission error<br />- references to block parity to locate errors in blocks of data<br />
  7. 7. Question 8 (a)<br />The passport office has invested in the latest technology to allow reliable customer services and ensure good network security.<br />Discuss the advantages and disadvantages of common LAN topologies. [7]<br />
  8. 8. Answers Question 8 (a) #1<br />Any seven points from:<br />Ring:<br />- drawing/description of ring topology<br />- advantages:<br />- performs well if network traffic is heavy<br />- disadvantages:<br />- faulty connection between 2 stations can cause network crash<br />- difficult to add a new device once network already set up<br />
  9. 9. Answers Question 8 (a) #2<br />Bus:<br />- drawing/description of bus topology including terminator<br />- advantages:<br />- easy to add in new devices even if network already set up<br />- one device failing doesn’t affect rest of network<br />- no need to rely on hub or switch<br />- less cabling needed reducing cost<br />- disadvantages:<br />- hard to identify problem if fault occurs<br />- if there is a fault in spine, all stations on network fail<br />- network topology is out-dated<br />
  10. 10. Answers Question 8 (a) #3<br />Star:<br />- drawing/description of star topology<br />- advantages:<br />- if one device fails, rest of network is not affected<br />- can investigate network problems while it is running<br />- disadvantages:<br />- if the hub breaks down the whole network crashes<br />- requires more cabling<br />
  11. 11. Answers Question 8 (a) #4<br />Tree:<br />- drawing/description of tree topology:<br />- advantages:<br />- brings together advantages of star and bus topologies<br />- disadvantages:<br />- brings together all the disadvantages of star and bus topologies<br />- difficult network to wire up<br />
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