State three techniques used by a network administrator to detect and prevent computer crimes.

State three techniques used by a network administrator to detect and prevent computer crimes.

​(b) A company in town wishes to link its offices together. The linking may be through wireless or fibre optic network media.
(i) State two benefits that the company would gain from the use of metropolitan area network (MAN).
(ii) State three advantages of using wireless over fibre optic network media.
(iii) State two limitations of wireless communication. 
(iv) State two transmission media used in wireless transmission. 
(c) State three ways in which computer virus infection can be prevented other than through restricting the usage of removable storage media.

RESPONSES

(a) Audit trail

•  Use of antimalware software
•  Data encryption
•  Log files
•  Firewall
•  Intruder detection
•  User access levels
•  Password/Biometrics

(b)(i) High speed communication

•  Reduce data transfer charges
•  Provides a secured network .
•  Allow remote access
•  Media cannot be vandalised easily

(ii) No cumbersome cabling needed between sites.

•  Support multi-channel transmissions.
•  Wireless supports un-directed signals therefore allowing many recipients.
•  Do not require access rights on the land between the buildings.

(iii)Line of sight requirement.

•  Expensive towers required/high initial cost.
•  Subject to interference such as passing radio waves and weather conditions.
•  Very difficult to restrict access if it is un-directed.
•  Hard to secure
•  Easy to hack 

(iv) Satellite

•  Microwave
•  Radio waves/blue-tooth/infrared

(e) Firewalls

•  Antivirus
•  Policy formulation on the usage of internet/password/security
•  Using email instead of storage devices to transfer document files.
•  Use genuine/authentic/unpirated software

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