KNEC Diploma in ICT module 3 Data Communication and Networking past paper: July 2009. Answers

Answers for Data Communication and Networking past paper: July 2009.

Course Name:  Information and Communication Technology
Also Done By:
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Course Level:  Diploma
Sub Level:       Module III
Course Unit:   Data Communication and Networking
Exam body:    KNEC
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1. Distinguish between microwave and infrared signals as used in data communication ()
2. Explain the one advantage of synchronous over asynchronous data transmission ()
3. A bank is to transmit data from Kenya to United States of America. Describe three transmission impairments likely to affect data while on transit ()
4. State the sampling theorem as applied in pulse code modulation ()
5. Explain the function of a demultiplexer ()
6. With the aid of a diagram describe delta modulation technique ()
7. Distinguish between wavelength division multiplexing and code division multiplexing ()
8. Explain one advantage of distributed routing algorithm ()
9. Explain the function of each of the following layers of the OSI reference model: i) Data link ii)Session iii)Presentation ()
10. Explain two factors that necessitate network segmentation ()
11. With the aid of a diagram, describe circuit switching technique ()
12. Distinguish between the two types of ISDN interfaces ()
13. Outline the procedure for manually assigning a computer an IP address. Assume window based operating system environment ()
14. Explain one danger that may arise due to use of telnet service by organizational employees ()
15. Figure 1 shows a typical port in a computer system. State two devices that may be connected to the port. ()
16. Identify two levels of synchronization that may be applied to a communication system ()
17. State two disadvantages of a mesh topology ()
18. Explain the following terms as used in error control: i) overhead bits; ii) Sliding window ()
19. Outline three security levels that can be applied in a network ()
20. Distinguish between a datagram and a frame ()
21. During a network configuration, a student used the commands ping and traceroute. Distinguish between the two commands ()
22. Describe the operation of a bridge ()
23. Define the following terms as applied in data communication: I)protocol II)Parity bit ()
24. Explain the term piggy backing as used in data communication ()
25. Figure shows a window generated during a browsing session. Use it to answer the questions that follow i)State two possible causes of the message generated. ii)Other than the web browser displayed in the window, state two other browsers that can be used. iii) Explain the function of each of the following features labeled I and II ()
26. Outline four advantages of fibre optic cable over coaxial cable ()
27. Plazo international company has won a tender to install a wide area network for a particular bank across the country. Explain four factors to be considered during network design ()
28. Explain one disadvantage of flooding routing technique ()
29. State one application of flooding routing technique ()
30. Study figure 5 and then answer the question that follows Identify the multiplexing technique represented by the diagram ()
31. Explain two advantages of installing air conditioning systems in a computer room ()
32. Distinguish between data and baud as applied in data transmission ()
33. Describe a virtual circuit ()
34. The following are typical IP addresses for computers in a network. Identify the class for each IP address. i) 129.151.4.8 iii) 192.110.103.22 iii) 122.117.100.21 ()
35. Describe the following network standards: i) 10Broad36; ii)1000BaseT ()
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