CIT303 : Principles of Communication Technology (2017)

NATIONAL OPEN UNIVERSITY OF NIGERIA

University Village, Plot 91, Cadastral Zone, NnamdiAzikiwe Express Way, Jabi, Abuja

Faculty of Sciences

July 2017

Course Code: CIT 303                                                                                    Course Unit: 3
Course Title: Principles of Communication Technology
Instruction: Answer Question One and Any Four Other Questions
Time allowed:  2 1/2 hrs
 
1a.          Define the term ‘Data Communication’                                                                                                 2 marks
b.            Outline and discuss four components of data communication.                                                    6 marks
c.             Mention 4 different forms in which data is represented today                                                    4 marks
d.            Define the following terms
i. Cipher               ii. Key                                                                                                                                    4 marks
e.            list and explain three causes of transmission impairment.                                                             6 marks
 
2a.          Enumeratethree major criteria that a networkmust be able to meet                                       3 marks
b.            With the aid of a well labeled diagram write a short note on the following possible connection types
i. Point-to-Point
ii. Multipoint                                                                                                                                                      4 marks
c.             Explain what is meant by the physical topology of a network                                                       3 marks
d.            List the key elements of a protocol.                                                                                                         2 marks
 
3a.          Describe the OSI model                                                                                                                                                4 marks
b.            State the role of the Session Layer of the OSI model                                                                       3 marks
c.             Enumerate the five layers of the TCP/IP model                                                                                  5 marks
 
4a.          Explain why the TCP/IP is the most widely used protocol in the world.                                    3 marks
b.            Define the following terms
i. LAN
ii. WAN
iii. Router
iv. Hub
v. Firewall
vi. Modem                                                                                                                                                          6 marks
c.             Write a short note on the technical barriers in VOIP                                                                         3 marks
 
5a.          Give two major disadvantage of the bus topology                                                                            3 marks
b.            Distinguish between guided media and unguided media.                                                                              3 marks
c.             Explain four characteristics that determine the effectiveness of a data communications system                                                                                                                                                                                                 6 marks
6a.          Differentiate between the following
i.                     A computer with a NOS and one without an NOS
ii.                   Peer-to-Peer and Client/Server networks
4 marks
b.            Define the following modes of data communication between two devices
i. Simplex             ii. Half-Duplex          iii. Duplex                                                                                      3 marks
c.             Use the Caesar cipher with the key = 9 to encrypt the message “NOUN”                                               2 marks
d.            Enumerate the five services provided by Network Security                                                          3 marks
You can get the soft copy for this course (2014-till date) at a little token or the exam summary answers for this course from 08039407882

Exam summary sample below

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