Question 1:
a) Identify the benefits that a LAN provides to a business compared with the use of standalone computers.
b) A company intends to install a LAN in its headquarters building. Choose an appropriate network configuration for each of the following situations. In each case:
i) Describe the network you have chosen
ii) Explain why this configuration would be appropriate.
The building is a long, narrow building and might need additional terminals to be added at a later date in any part of the building. Costs must be kept as low as possible.
The building is square. It is necessary which must one of the terminals fail; the others are not influenced by this problem.
c) Describe how a packet switching system works.
Question 2:
a) Describe in detail how a user can send a copy of a spreadsheet model to a friend by e-mail. List all the steps.
b) If the receiver is in a distant country, explain:
• The route that the e-mail will take and
• WHEN each step will take place after the sender selects SEND
c) An e-mail account holder can normally customize the manner that his INBOX is presented. Explain the options he can choose and how they are accomplished.
d) Describe why an e-mail user must clear out his IN and OUT boxes at regular intervals.
Question 3:
a) Explain the role the network administrator performs in a large organization.
b) Describe what is meant by a computer virus. Describe how it is:
• Created
• Transmitted
• Controlled
c) Describe in brief the process of public key encryption.
Question 4:
a) Differentiate between amplitude and frequency modulation of data transmission with references to the carrier wave.
b) With particular reference to business situations, explain the merits of network systems.
Identify demerits that the use of a network might impose.
c) Describe how packet-switching works.