Data Base Communications And Telecommunications Network 1 Question Paper

Data Base Communications And Telecommunications Network 1

Institution: Kenya Methodist University question papers

Exam Year:2010

FACULTY : SCIENCE AND TECHNOLOY

DEPARTMENT : CIS AND BIT

TIME : 2 HOURS

INSTRUCTIONS Answer Question ONE and any Other TWO Questions

Question 1

a) Compare the following stating the advantages and disadvantages of each as computer Networking Media.

i) UTP and Coaxial (5marks)

ii) Fibre Optic and Shielded Twisted Pair (5marks)

b) Briefly describe the following errors in data communication (6marks)

i) Jitter

ii) Echo

iii) Crosstalk

c) What do the terms simplex, half-duplex and duplex mean. Illustrate with examples. (6marks)

d) What is the difference between a multiplexer and a concentrator (2marks)

e) Compare the following network topologies and state the their advantages and disadvantages

i) Ring topology and mesh topology (6marks)

Question 2

a) ‘10BaseT’ is a commonly deployed LAN standard. What do the terms ‘10’, ‘Base’ and ‘T’ denote respectively? (3marks)

b) Using a block diagram explain the major components of a digital data communications system. (8marks)

c) Briefly describe THREE elements of a computer network. (6marks)

d) Briefly explain the following techniques used in modulation for data i) Amplitude shift keying

ii) Phase shift keying

iii) Frequency shift keying (6marks)

Question 3

a) Explain the roles of the OSI Model (14marks)

b) What are the advantages of Guided media over wireless media in computer Communications. (6marks)

Question 4

a) Distinguish, with the help of an example between proprietary, de facto and de jure systems used in computer data communications (4marks)

b) Write short notes on the following media access methods in computer networks. (6marks)

i) Polling

ii) Contention

iii) Token passing

c) State THREE Telecommunications Standard Organizations and Explain their Roles in Data Communications and Telecommunications Networks (2marks)

d) Distinguish between analog and digital communication. What are the advantages of digital communications systems? (2marks)

e) Briefly describe the functions of the following internetworking device. (6marks)

i) Bridge

ii) Router

iii) Gateway

Data Base Communications And Telecommunications Network 1 Question Paper

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