UNIVERSITY EXAMINATIONS: 2018/2019
EXAMINATION FOR THE DIPLOMA IN BUSINESS INFORMATION
TECHNOLOGY
DBIT 401: COMPUTER NETWORKS AND MANAGEMENT
DATE: AUGUST 2019 TIME: 2 HOURS
INSTRUCTIONS: Answer Question One & ANY OTHER TWO questions.
QUESTION ONE
a) Explain the five functions of a data communication system [5Marks]
b) Explain the functions of the following network components
i) Network adaptor [2Marks]
ii) Gateway [2Marks]
iii) Router [2Marks]
c) Explain four reasons why an organization may decide not to install a computer network
[4Marks]
d) State any four tools that are required to terminate a twisted pair cable [4Marks]
e) State four ways that a university student can benefit from the internet [4Marks]
f) Outline three advantages of client-server network architecture [3Marks]
g) Give four differences between a small and a large network [4Marks]
QUESTION TWO
a) IP addresses can be assigned either statically or dynamically. Explain the difference between the two
stating where each is appropriate [4Marks]
b) Describe the following data transmission modes
i) Simplex
ii) Duplex
iii) Parallel mode
iv) Half duplex mode [10Marks]
c) State three merits and three demerits of the OSI reference model [6Marks]
QUESTION THREE
a) Outline the four principles that were used to arrive at the seven layers of the OSI model [4Marks]
b) Explain two causes of signal impairment in data communication [4Marks]
c) Describe three applications of computer networks in an organization [6Marks]
d) Explain the three categories or units of internetworking [6Marks]
QUESTION FOUR
a) Describe any four types of servers found in a computer network. [8Marks]
b) Describe four measures that employers could put in place to deal with internet related threats at the
workplace [8Marks]
c) Briefly describe any four protocols that are relevant at the application layer of the TCP/IP reference
model [4Marks]
QUESTION FIVE
a) With the aid of a diagram, show the comparison between OSI reference model and TCP/IP reference
model [8Marks]
b) State four factors that may cause congestion in computer networks [4Marks]
c) 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. Explain four reasons why organizations should adhere to
network standards [8Marks]
