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<=KNEC Diploma in ICT module 3 Data Communication and Networking past paper: November 2014
An analog signal carries four bits in every signal element. If 1000 signal elements are send per second, determine the following: (6mks)
i) Band rate.
ii) Bit rate.
i) Band rate.
ii) Bit rate.
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Questions List:
1. Using examples describe the following concepts as applied in data communication: (6mks) i) Data Terminal Equipment. (DTE) ii) Half duplex connection. iii) Full duplex connection.
2. With the aid of a sketch describe each of the following transmission media. (4mks) i)Satellite link. ii)Microwave
3. Explain each of the following keying techniques: (6mks) i) Amplitude shift keying. ii) Frequency shift keying.: iii) Phase shift keying.
4. Describe the role of Carrier Sense Multiple Access/Collision Detection or [CSMA/CD] in data communication.
5. Explain the term ‘multiplexing’ as used in data communication
6. With the aid of a diagram explain Frequency Division Multiplexing
7. Describe the following mechanisms of packet switching: (6mks) i) Virtual circuit. ii) Datagrams networks. iii) Message switching.
8. Outline three advantages of Digital Transmission over analogue
9. Distinguish between centralized and distributed networks
10. Distinguish between unipolar and bipolar signals
11. An analog signal carries four bits in every signal element. If 1000 signal elements are send per second, determine the following: (6mks) i) Band rate. ii) Bit rate.
12. Describe the following encoding techniques: (4mks) i) NRZ-L; ii) NRZ-I
13. Define the concept ‘propagation delay’
14. Differentiate between blocking and non-blocking as used in switching giving one example in each case
15. Outline the operations of an electronic mailing system
16. Explain the operation of checksum generator
17. With the aid of a diagram, describe the operations of a Tree Topology Scheme computer networks
18. With the aid of a diagram, explain the work of an X-25 interface
19. Explain the following routing techniques: (6mks) i)Adaptive ii) Brouter iii) Flooding
20. Omega Club has been in operation in Kenya for the last two years. The club intends to extend its operations to the rest of east Africa countries. (8mks) i) Describe two networks they could implement. ii) List two advantages of networking they could implement.
21. Outline three services that an Integrated Service Digital Network (ISDN) offers to the user.
22. Ken has been requested to make a presentation in a workshop on the Open System Interconnection (OSI) model of communication. (9mks) i)Identify the three lowest levels in the model. ii)Explain the function of each level in (i)
23. Explain three advantages of layered architecture.
24. Describe the transport Control Protocol / IP (TCP/IP).
25. Discuss the following terms as used in data communication: - (4mks) i) Piggy backing; ii)Bit Stuffing
26. Outline two benefits to the user for applications of Basic Rate Interface (BRI) service as applied in Integrated Service Digital Network (ISDN).
27. Describe the Guided Transmission Media giving two suitable examples
28. Explain the causes and methods used to minimize each type of the following noise: i)Thermal noise. ii) Impulse noise iii) cross talk iv) Jitter
1. Using examples describe the following concepts as applied in data communication: (6mks) i) Data Terminal Equipment. (DTE) ii) Half duplex connection. iii) Full duplex connection.
2. With the aid of a sketch describe each of the following transmission media. (4mks) i)Satellite link. ii)Microwave
3. Explain each of the following keying techniques: (6mks) i) Amplitude shift keying. ii) Frequency shift keying.: iii) Phase shift keying.
4. Describe the role of Carrier Sense Multiple Access/Collision Detection or [CSMA/CD] in data communication.
5. Explain the term ‘multiplexing’ as used in data communication
6. With the aid of a diagram explain Frequency Division Multiplexing
7. Describe the following mechanisms of packet switching: (6mks) i) Virtual circuit. ii) Datagrams networks. iii) Message switching.
8. Outline three advantages of Digital Transmission over analogue
9. Distinguish between centralized and distributed networks
10. Distinguish between unipolar and bipolar signals
11. An analog signal carries four bits in every signal element. If 1000 signal elements are send per second, determine the following: (6mks) i) Band rate. ii) Bit rate.
12. Describe the following encoding techniques: (4mks) i) NRZ-L; ii) NRZ-I
13. Define the concept ‘propagation delay’
14. Differentiate between blocking and non-blocking as used in switching giving one example in each case
15. Outline the operations of an electronic mailing system
16. Explain the operation of checksum generator
17. With the aid of a diagram, describe the operations of a Tree Topology Scheme computer networks
18. With the aid of a diagram, explain the work of an X-25 interface
19. Explain the following routing techniques: (6mks) i)Adaptive ii) Brouter iii) Flooding
20. Omega Club has been in operation in Kenya for the last two years. The club intends to extend its operations to the rest of east Africa countries. (8mks) i) Describe two networks they could implement. ii) List two advantages of networking they could implement.
21. Outline three services that an Integrated Service Digital Network (ISDN) offers to the user.
22. Ken has been requested to make a presentation in a workshop on the Open System Interconnection (OSI) model of communication. (9mks) i)Identify the three lowest levels in the model. ii)Explain the function of each level in (i)
23. Explain three advantages of layered architecture.
24. Describe the transport Control Protocol / IP (TCP/IP).
25. Discuss the following terms as used in data communication: - (4mks) i) Piggy backing; ii)Bit Stuffing
26. Outline two benefits to the user for applications of Basic Rate Interface (BRI) service as applied in Integrated Service Digital Network (ISDN).
27. Describe the Guided Transmission Media giving two suitable examples
28. Explain the causes and methods used to minimize each type of the following noise: i)Thermal noise. ii) Impulse noise iii) cross talk iv) Jitter
