PHS CyberSchool

Computer Studies SG Grade 12 - 2006

Last updated 07 Jun 2006

Theory examination May 2006 - 90 minutes - 71 marks - Answers

Question 1 - Multiple-choice questions - 1 mark each - 10 marks

1. D
2. D
3. D
4. D
5. B
6. B
7. C
8. D
9. C
10. A

/10/

Question 2 - Matching columns - 1 each - 10 marks

1. L
2. G
3. H
4. D
5. A
6. E
7. B
8. K
9. F
10. I

/10/

Question 3 - System software - 20 marks

1. Viruses
   1. In primary memory (1)
   2. New viruses are being developed all the time, hence it must be regularly updated (1)
   3. On the anti virus software web site  (1)
2. Network operating systems
   1. Server based (1)
   2. Peer to peer (1)

3. Features of network operating systems not found in modern operating systems

   • Control and maintain a database of users, user groups and their respective access rights to the network
   • Allow users to share files / printers, etc.
   • Control and manage mail on the local network / Internet
   • ‘Publish’ web pages for viewing on the Internet
   •  Protect a computer / network from malicious code / hacker
   • 'Cache’ the pages accessed from your network to speed up the Internet (2)
4. Give TWO examples of utility packages and indicate how each is used.  (2)
5. Free up space
   • Defrag
   • Zip files - then remove 'big' file
   • Delete unwanted old files
   • Uninstal unwanted programs
   • Empty rcycle bin.
   • Delete temporary files  Describe one in detail (2)
6. Application creates something on the computer, e.g. Word; System software helps manage and run the computer. (2)
7. Backup, Defrag, Anti virus update - Explain the function of each task. (3)
8. Functions of operating system
   • Controlling the CPU
   • Controlling memory – memory management
   • Controlling storage – storage management
   • Controlling the peripherals – device I/O
   • Managing the way programs access these resources  - process control
   • Managing security (who can access what) (4)

   /20/

   Question 4 - Networking and data communications - 31 marks

   1. W
      1. token passing or polling (1)
      2. electro magnetic (1)
      3. digital (1)
      4. bus, hierarchical (1)
   2. T
      1. Novell, Unix, Linux, Windows NT or Windows 2000 (1)
      2. Client (1)
      3. /d deliver / provide  (1)  or require (1)
   3. T
      1. Twisted-pair cable, coaxial cable, fiber-optic cable (1)
      2. Broadcast radio, cellular radio, microwave radio, communications satellite, infrared, bluetooth  (1)
   4. A communications device that enables computers to communicate via telephone lines. A computer's digital signals must be converted to analogue signals. (2)
   5. Passwords
      1. Use numbers and letters, at least 5 letters long, change regular basis, keep secret, use a mixture of caps and small letters (2)
      2. Access to particular files only.  Level depends on position (2)
   6. An Intranet is an internal network using Internet and Web technologies within an organisation and for their exclusive use.  An Extranet is an Intranet that extends its use to (authorised) users outside of the organisation or company.  (2)
   7. U
      1. Use numbers and letters, at least 5 letters long, change regular basis, keep secret, use a mixture of caps and small letters (2)
      2. Access to particular files only.  Level depends on position (2)
      3. Reduction of capital expenditure, centralisation of data, improved communication and sharing of data, better security (2)
   8. N
      1. Share expensive hardware like laser printers.
         Share information and data.
         Share software and programs by loading one copy on a server for all users.
         Communication across a network with other users. (2)
      2. Configuration or physical arrangement of the devices in a network  (1)
      3. Name TWO functions of a network administrator. (2)
      4. star, ring, bus, mesh, hierachical (3)
      5. Restricting physical access.
         Passwords/logon-names.
         Set access rights per group/user.
         Set file/folder rights.
         Logout accounts after a significant number of attempts to enter a password.
         Force passwords to be reset on a regular basis.
         Restricting hours.
         Use a firewall (3)

   /31/

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