UNIVERSITY EXAMINATIONS: 2020/2021
EXAMINATION FOR THE DIPLOMA IN BUSINESS INFORMATION
TECHNOLOGY
DBIT 401: COMPUTER NETWORKS AND MANAGEMENT
DATE: DECEMBER, 2021 TIME: 2 HOURS
INSTRUCTIONS: QUESTION ONE IS COMPULSORY, CHOOSE TWO OTHER
QUESTIONS
QUESTION ONE (20 marks) Compulsory
a. Describe the FOUR functions of a data communication system [4 Marks]
b. Explain the functions of the following network components
i. Gateway [2 Marks]
ii. Router [2 Marks]
c. Describe FOUR reasons why an organization may decide not to install a computer
network [4 Marks]
d. Describe FOUR demerits of TCP/IP reference model [4 Marks]
e. Give FOUR differences between a small and a large network [4 Marks]
QUESTION TWO (15 marks)
a. With the aid of a diagram, show the comparison between OSI reference model and
TCP/IP reference model [8 Marks]
b. Explain THREE advantages of client-server network architecture [3 Marks]
c. Explain FOUR factors that may cause congestion in computer networks [4 Marks]
QUESTION THREE (15 marks)
a. Differentiate between the following with reference to computer networks [6 Marks]
i. Peer to peer and client server network architecture
ii. Thinnet and thicknet coaxial cable
iii. Fiber optic and twisted pair cable
b. Describe FOUR ways that KCA University student can benefit from the internet
[4 Marks]
c. Discuss FIVE factors to consider when choosing a Transmission Media [5 Marks]
QUESTION FOUR (15 marks)
a. Network standards are essential in creating and maintaining an open and competitive
market for equipment manufacturers and in guaranteeing national and international
interoperability of data and telecommunications technology and processes.
Due to the information above, explain FOUR reasons why organizations should adhere
to network standards [8Marks]
b. Define the term topology and state the difference between logical and physical network
topologies [3 Marks]
c. Describe FOUR advantages of wireless over wired networks [4 Marks]
