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Data Communication Question Paper

Data Communication

Course:Diploma In Computer Studies (Computer Studies)

Institution: Kenya Polytechnic question papers

Exam Year:2005

1. (a) With the aid of a labelled diagram, describe the basic elements of ARQ in error control. (8 marks)
(b) State two advantages of digital transmission. (2 marks)
(c) Explain four hardware components of a LAN. (8 marks)
(d) State one advantage and one disadvantage of the fiber-optic cable. (2 marks)

2. (a) Describe the following:
(i) Switched networks.
(ii) Broadcast networks. (4 marks)
(b) Explain the role of the following protocols :
(i) Medium Access Control (MAC)
(ii) Peer to peer
(c) With the aid of a diagram, explain the transmission and connection of a multi-drop telephone line with 4-terminals to a central host computer. (5 marks)
(d) (i) Distinguish between Time-division multiplexity and Frequency division multiplexing. (4 marks)
(ii) List two objectives of routing methods. (2 marks)

3. (a) (i) Draw a well labeled CCITT x.25 user network interface diagram.
(ii) List one function performed by each layer in a (i). (7 marks)
(b) (i) With the aid of a diagram, describe a datagram network. (8 marks)
(ii) Explain the advantage of datagram networks over packet switching networks.
(c) (i) Explain Line coding
(ii) State three factors to consider in Line Coding. (5 marks)

4. (a) Outline two aims of each of following institutions.
(i) ISO
(ii) IEEE (4 marks)
(b) (i) With the aid of a diagram, illustrate the TC/IP layers.
(ii) Outline three benefits of layered architecture. (8 marks)
(c) Explain the differences between circuit switching and message switching in terms of :
(i) Message storage.
(ii) Message delay.
(iii) Mode of Transmission
5. (a) With the aid of waveforms, explain the following line encoding schemes; Assuming the input data is 001011.
(i) Return to zero.
(ii) Differential manchester.
(iii) Bipolar. (6 marks)
(b) State two advantages of Biphase encoding scheme. (2 marks)
(c) Describe the following devices :
(i) Concentrator.
(ii) Bridge.
(iii) Multiplexer. (6 marks)
(d) Distinguish between the following :
(i) Baseband and Broadband LAN.
(ii) In-band a Out-band signaling. (6 marks)

6. (a) Describe the functions of NIC. (3 marks)
(b) Explain with the aid of a diagram, the operation of a four-node Token-ring network configured to enhance its efficiency. (6 marks)
(c) Distinguish between centralized and distributed routing showing their suitability. (5 marks)
(d) (i) Distinguish between the network operating system features: Trustee security and Directory security.
(ii) Explain the function of Network operating system. (6 marks)
7. (a) Explain the following CMA schemed:
(i) I-Persistent.
(ii) Non-Persistent. (6 marks)
(b) With reference to a ring topology
(i) Define ring latency.
(ii) Distinguish between multitoken operation and single-token operation. (6 marks)
(c) With the aid of a diagram, distinguish between a command and a response as applied in HDLC.

8. (a) With the aid of a labeled signal flow diagram, describe the functions of the x 21 Interface signals. (9 marks)
(b) Explain the following modulation technique, showing the signals generated :
(i) Amplitude shift keying.
(ii) Frequency shift keying. (4 marks)
(c) Using a diagram, show the message format for synchronously transmitted data. (4 marks)
(d) (i) Define "hamming" distance.
(ii) Determine the hamming distance between the codes 111010 and 100000. (3 marks)

Data Communication Question Paper

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