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Cisy 231:Data Communication Question Paper

Cisy 231:Data Communication

Course:Computer Information Systems

Institution: Kenya Methodist University question papers

Exam Year:2011

FACULTY : SCIENCE AND TECHNOLOGY

DEPARTMENT : CIS AND BIT

TIME : 2 HOURS

INSTRUCTIONS Answer Question ONE and any Other TWO Questions

Question 1

a) Define the following terms:

i) Flow control

ii) Error control

iii) IP address

iv) Sliding window method (6 marks)

b) Given a channel with an intended capacity of 32 Mpbs, the bandwidth of the channel is 4 MHZ. What SNR in db is required to achieve this capacity. (4 marks)

c) Briefly explain the purpose of ATM (Asynchronous Transmission Mode) and Frame relay technologies in wide area networks. (6 marks)

d) Differentiate between the terms Baud Rate and Transmission Rate as used in data communication (4 marks)

e) Compare applications of parallel and serial data transmission methodologies (4 marks) f) Briefly discuss the suitability of Ethernet and Token Ring technologies for a lightly loaded network or a heavily loaded network. (6 marks)

Question 2

a) Explain two major data transmission impairments (8 marks)

b) Discuss how the problems in (a) above have been reduced in copper, optic fiber and microwave media (12 marks)

Question 3

a) Briefly explain the role of the four successive layers of the TCP/IP network model (10 marks) b) Explain about the following statement, "TCP is connection-oriented, IP is connectionless". (4 marks)

c) How does encapsulation contribute to error free transmission of data between application programs in the source and the destination computer? (6 marks)

Question 4

a) Elaborate on the two main techniques used to establish a connection between two devices wishing to communicate with another and have no direct connection (10 marks)

b) What is a router? Give four reasons why a router is appropriate in connecting a College LAN to the internet. (6 marks)

c) A digital signaling system is required to operate at 56000 bps If the signal used has 8 levels, what is the minimum required bandwidth of the channel? (4 marks)

Question 5

a) Explain what a client/server network model is and demonstrate how the concept applies to an end user of email and browsing internet services. (10 marks)

b) Draw and explain the block diagram of fiber optic communication. State two light sources and two light detectors. (10 marks)

Cisy 231:Data Communication Question Paper

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