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Internetworking With Tcp/Ip Question Paper

Internetworking With Tcp/Ip

Course:Bachelor Of Computer Science (It Telecommunication)

Institution: Kabarak University question papers

Exam Year:2010

KABARAK
UNIVERSITY

UNIVERSITY EXAMINATIONS
2010/2011 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF COMPUTER SCIENCE
COURSE CODE: COMP 461
COURSE TITLE: INTERNETWORKING WITH TCP/IP
STREAM:
Y4S2
DAY:

WEDNESDAY
TIME:

9:00 –11:00A.M.
DATE:

08/12/2010

INSTRUCTIONS
• Answer ALL questions in section A and any TWO questions in section B
• All questions in section B carry equal marks

PLEASE TURN OVER

Page 1 of 5

SECTION A: ANSWER ALL QUESTIONS IN THIS SECTION

QUESTION ONE (30 MARKS)

a) Which two statements concerning networking standards and protocols are true? (Choose two.)
[2 marks]
a) Adds complexity to networks encourages vendors to create proprietary protocols
b) provides consistent interconnections across networks
c) Ensures that communications work best in a single-vendor environment
d) simplifies new product development

b)
i).
State the OSI layer that offers reliable, connection-oriented data communication
services and identify the protocol responsible for this service
[2 marks]

ii).
Other than the service stated above outline THREE other services offered by the
protocol identified in b(i) above

[3 marks]

c)
i).
Which two functions of the OSI model occur at layer two? (Choose two.) and sate the
protocols responsible for each choice

[4 marks]

a) physical addressing
b) encoding
c) routing
d) cabling
e) media access control

Page 2 of 5

ii).
Refer to the exhibit. What two facts can be determined from the information that is
given? (Choose two.)

[2 marks]
a) The source port indicates that a Telnet session has been initiated.
b) The data is flowing from server to client.
c) The destination port indicates that an HTTP session has been initiated.
d) The data listed is associated with the transport layer.
e) The source port does not support communication with the destination port that is
listed.

iii).
Refer to the exhibit above. Which two statements describe the information that is
represented in the header? (Choose two.)

[2 marks]
a) This is a server response.
b) The UDP protocol is being used.
c) The destination port indicates a Telnet session.
d) The return segment will contain a source port of 23.
e) The next session originated from the client of this session will use the source
port number 13358.

Refer to the exhibit. The diagram represents the process of sending e-mail between clients. Identify
the protocol and /or mail handling programs used at each numbered stage of the diagram and state
its function

[8 marks]

d) State the protocols responsible for the following functionalities in data communication
networks.

[1 mark]
i).
Providing connections over regular telephone lines using modems on both ends
ii).
Providing remote logins.

Page 3 of 5

e) State with reasons the protocol that you would install in a network to fulfill each of the
following tasks

[6 marks]

i).
A protocol that Allow users to communicate over the internet
ii).
A protocol requiring minimal configuration to enable communication within the workgroup
iii).
A protocol that enables highs peed transmission of large amounts of audio, video and data
files simultaneously over a network

SECTION B: each Question is worth 20 Marks Answer Any TWO Questions
QUESTION TWO (20 MARKS)

a)
i).
Outline the THREE parameters used in the IEEE naming convention for Ethernet
standards

[3 marks]
ii).
In view of the naming convention standards explain the meaning of 100BaseT Ethernet
[3 marks]

iii).
Distinguish between fast Ethernet and gigabit Ethernet

[2 marks]

iv).
Ethernet has survived the test of time as the major LAN technology Outline FOUR
characteristics of Ethernet standard that has contributed to this dominance. [4 marks]

a) Link layer protocols can provide reliable or unreliable service. Why would one ever design a
protocol a protocol to provide unreliable service? Given an example, other than a reliable
physical layer of an application where a reliable data link layer would be a poor choice.

[5 marks]

QUESTION THREE (20 MARKS)
a) State the protocols responsible for the following functions
i).
Allow a remote user to log on to the system and run console programs by using the
command line
ii).
Define the way files are attached to SMTP messages
b) What information can be gathered by using the command netstat? (Choose two) [2 marks]
a. the default gateway
b. the routing protocol
c. active TCP connections
d. the locally configured subnet mask
e. active UDP connections

Page 4 of 5

c) Outline THREE aims of FTP protocol is to

[3 marks]
d)
i).
State the protocols involved to boot remote computers over a network. [3 marks]
ii).
Explain what happens when a remote client boots Cleary outlining how the protocols listed
above are involved

[10 marks]
QUESTION FOUR (20 MARKS)

a) State three characteristics of CSMA/CD

[3 marks]

b) What is Time Division Multiplexing (TDM)? Explain how it works. Feel free to use a
drawing to illustrate your answer.

[3 marks]

c) i) What is Statistical Multiplexing, a.k.a. broadcasting and how does it work? [3 marks]

ii) Outline the shortcoming of statistical Multiplexing. [2 marks]

iii) Under what circumstances is Statistical Multiplexing preferable to static multiplexing
techniques? [3 marks]

d) Consider a real-time network such as a one that is of a manufacturing process or a chemical
process. Assume that the network must carry regularly scheduled time-sensitive commands
and measurements between physical devices and the computerized control system. Would a
networking technology based on TDM be more or less desirable than one based on
CSMA/CD? Why?

[5 marks]
QUESTION FIVE (20 MARKS)

a)
i). Outline the role of a network access server (NAS) in a traditional remote access
scenario.

[2 marks]

ii). Explain how the services offered by the network access server in a traditional access
scenario are achieved by L2TP

[4 marks]

iii). Outline the advantage of the L2TP approach to remote connectivity over other
remote access technologies

[2 marks]
iv). Explain why security is an issue in L2TP

[2 marks]
b)
i). what is meant by a Virtual Private Network (VPN) [2 marks]
ii). Outline the meaning of a tunnel as applied in internetworking protocols [3 marks]
iii). Explain the process of building a VPN using Layer 2 Tunneling Protocol(L2TP)

[3 marks]
iv). What additional functionality does IPSec offer on L2TP implementation[2 marks]

Page 5 of 5

Internetworking With Tcp/Ip Question Paper

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