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

Source: KCSE Computer Studies 2012 - Paper 1
Question Number: 18 (a)(b)(c) 
Marks: 15 Marks
From Topic: Career opportunities in ICT
From Subtopic: System Administrators
Question Level: Form 4

(a) State three techniques used by a network administrator to detect and prevent computer crimes. (3 marks)

Expected Response

1. Audit trail
2. Use of anti malware software
3. Data encryption
4. Log files
5. Firewall
6. Intruder detection
7. User access levels
8. Password/Biometrics

​(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). (2 marks)
From Topic: Introduction to Networking and Data Communications
From Subtopic: Types of networks
Question Level: Form 4
Expected Response

1. High speed communication
2. Reduce data transfer charges
3. Provides a secured network
4. Allow remote access
5. Media cannot be vandalized easily

(ii) State three advantages of using wireless over fibre optic network media.
(3 marks)
From Topic: Introduction to Networking and Data Communications
From Subtopic: Elements of Networking
Question Level: Form 4
​Expected Response

1. No cumbersome cabling needed between sites.
2. Support multi-channel transmissions.
3. Wireless supports un-directed signals therefore allowing many recipients.
4. Do not require access rights on the land between the buildings.

(iii) State two limitations of wireless communication. (2 marks)
​From Topic: Introduction to Networking and Data Communications
From Subtopic: Elements of Networking
Question Level: Form 4
​Expected Response

1. Line of sight requirement.
2. Expensive towers required/high initial cost.
3. Subject to interference such as passing radio. Waves and weather conditions.
4. Very difficult to restrict access if it is undirected.
5. Hard to secure
6. Easy to hack

(first 2 x 1 = 2 marks)

(iv) State two transmission media used in wireless transmission. (2 marks)
​From Topic: Introduction to Networking and Data Communications
From Subtopic: Elements of Networking
Question Level: Form 4
Expected Response

1. Satellite
2. Microwave
3. Radio waves/bluetooth/infrared

(first 2 x 1 = 2 marks)

​(c) State three ways in which computer virus infection can be prevented other than through restricting the usage of removable storage media. (3 marks)

​From Topic: Data Security and Controls
From Subtopic: Security Threats and Control Measures
Question Level: Form 2
Expected Response

1. Firewalls
2. Antivirus
3. Policy formulation on the usage of internet/password/security
4. Using email instead of storage devices to transfer document files.
5. Use genuine/authentic/un-pirated software

(first 2 x 1 = 2 marks)

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