Sit 306 Question Paper

Sit 306

Course:Bachelor Of Science In Information And Technology

Institution: Kenyatta University question papers

Exam Year:2011

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2010/2011
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN INFORMATION
TECHNOLOGY
SIT 306: DATA COMMUNICATIONS AND NETWORKING

DATE: Thursday 3rd February, 2011
TIME: 2.00 p.m. – 4.00 p.m.
_________________________________________________________________________________
INSTRUCTIONS
Answer question 1 and any other TWO.

QUESTION 1
a)
Define the term Computer Network.

[2 marks]
b)
Explain why there is no need for CSMA/CD on full duplex Ethernet LAN.
[3 marks]
c)
Explain the difference between unicast, multicast and broadcast as used in networking.

[3 marks]
d)
Describe the evolution of Ethernet technologies showing clearly the differences in the data rates.

[8 marks]
e)
What is DSL technology? Discuss the differences between DSL and leased lines.

[4 marks]
f)
Use the following address to answer the following questions:

193.40.58.0

i)
Identify the class this address belongs

ii)
Convert this address to binary

iii)
What is its subnet mask?

iv)
Calculate the number of subnets created. Hosts per subnet and the new subnet mask is 4
bits are borrowed in the process of subneting.

[10 marks]

QUESTION 2
a)
With the aid of a well labeled diagram, show the relation between TCP/IP and OSI model layers.

[6 marks]
Page 1 of 2

b)
Discuss the process of token passing as a network data communication method, and mention two
advantages of using a token passing over Ethernet.

[4 marks]
c)
With aid of a diagram describe FDDI and explain the advantages over token passing.

[5 marks]
d)
Discuss the functional differences between a switch and a hub.

[5 marks]

QUESTION 3
a)
A router receives a packet from a certain node; explain how such a packet is further forwarded to
the right segment.

[6 marks]
b)
Differentiate between a routing and routed protocols as used in IP routing.
[4 marks]
c)
Discuss the following VPN, Vlan, extranet and intranet.

[4 marks]
d)
State and explain the benefits of unguided networking.

[4 marks]

QUESTION 4
a)
Explain the differences between distant vector and link state algorithms as used in IP routing.

[5 marks]
b)
Distinguish between public and private IP addresses.

[2 marks]
c)
Write short notes on the following:

i)
ISDN

[4 marks]

ii)
ATM

[4 marks]

iii)
Frame relay

[3 marks]

iv)
Token

[2 marks]

QUESTION 5
a)
A network Engineer requires to add 6 subnets in the organizations’ network. Explain why he
may have seen the need to add the subnets. How many bits does he need to borrow and how
many hosts will each subnet accommodate? Identify the new subnet mask. (Assume that the IP
address 172.16.0.0)

[6 marks]
b)
State and explain the importance of a proxy server and Domain name server in a Network.

[6 marks]
c)
Clearly explain the differences between fibre optic and twisted pair cables based on structure,
performance and application.

[8 marks]

……………………………..
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Sit 306 Question Paper

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