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Comp 222:Telecommunications And Computers December 2008 Question Paper

Comp 222:Telecommunications And Computers December 2008

Course:Bachelor Of Computer Science

Institution: Kabarak University question papers

Exam Year:2008

KABARAK UNIVERSITY
EXAMINATIONS
2008/2009 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF COMPUTER
SCIENCE
COURSE CODE: COMP 222

INSTRUCTIONS:
Attempt Question One and any other Two Questions.

Question 1(30 marks)
a)
Name two well known data transport protocols provided by the Internet Transport
Layer.
Provide a brief description of each service and indicate what type of application might
use that service. [6 Mks]
b)
Describe the token bucket mechanism for congestion control.
With which other technique is token bucket usually combined to achieve complete flow
control?
What problems in the simpler approach are addressed by using a token bucket
mechanism? [9 Mks]
c)
Networks may be divided into three main categories, differing primarily in their
geographical range, discuss those three network types. [6 Mks]
d)
One way of describing networks is by their shape, or topology. Networks can be laid out in
different ways. Using diagrams discuss the three basic topologies. [9 Mks]
Question 2: (20 marks)
Describe the OSI seven layer model. Name each of the layers in the model and draw
a diagram that shows the ordering of these layers. Write a paragraph describing the
areas of function that each layer is responsible for.
Contrast the OSI model you have just described with the TCP/IP reference model.
Using a diagram show the correspondence between relevant protocol layers in the two
models.
Discuss the relative merits of each of these models in the context of modern computer
networking. [20 Mks]
Question 3: (20 marks)
Describe the physical construction characteristics of the following transmission media.
If there is more than one type of each media then present the choices of type, and
identify the differences between them.
i. Twisted pair
ii. Coaxial cable
iii. Optical fibre cable
Possible choices for data communication infrastructure for long distance data transfer
include microwave, optical fibre and radio transmission.
Discuss the advantages and disadvantages of each of these media, in terms of cost,
political impact, ease of installation and adaptability in providing a range of services
to clients. [20 Mks]
Question 4: (20 marks)
a)
Define the role of a firewall and draw a diagram that shows where a firewall should
be positioned with relation to protecting a local network. In defining the role of a
firewall, you should discuss the techniques that a firewall uses at different levels to
prevent external attacks on the network and control traffic flow through the firewall.
[8 Mks]
b)
We are at the edge of a wireless revolution that is transforming computing and
information systems. This way end-users are availed computing resources with virtually
no time and place limitations. Thus, it makes possible for computing and information to
be placed at finger tips of end-users anywhere anytime. There are developments that
boost achievement of this goal and include devices and standards.
Discuss any of these four devices. [12 Mks]
Question 5: (20 marks)
a)
State and explain any four forms of information that can be carried by data
communication equipment. [8 Mks]
b)
Briefly explain the three main element of a communication system. [6 Mks]
c)
Differentiate between parallel and serial transmission stating one advantage and one
disadvantage for transmission method. [6 Mks]

Comp 222:Telecommunications And Computers December 2008 Question Paper

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