National Open University of Nigeria
Plot 91, Cadastral Zone, Nnamdi Azikiwe Expressway, Jabi – Abuja
Faculty of Science
NOVEMBER, 2018 EXAMINATIONS
COURSE CODE: CIT 303
COURSE TITLE: PRINCIPLES OF COMMUNICATION TECHNOLOGY
CREDIT: 3 Units
TIME ALLOWED: 2½ Hours
INSTRUCTION: Answer Question ONE (1) and any other FOUR (4) Questions
QUESTIONS
1.
a) Distinguish between Analog Signal processing and Digital Signal processing (4 marks)
b) Explain Data Communication and outline and explain their features. (3 marks)
c) Describe an Encryption and Decryption? (3 marks)
d) Outline and explain three Network criteria (3 marks)
e) Outline four (4) basic networking devices. (2 marks)
f) Differentiate between Symmetric-Key Cryptography and symmetric-Key Cryptography
(4 marks)
g) List three broad groups of wireless transmission: radio waves, microwaves, and infrared waves (3 marks) (22 Marks)
2.
a) Differentiate between guided media and unguided media with examples (4 marks)
b) Discuss the five services provided by Network security. (5 marks)
c) Outline three (3) examples of Network node or hardware equipment (3 marks)
3.
a) Describe with diagram the components of data communication (4 marks)
b) What is a protocol and list its key elements (4 marks)
c) List and explain different forms of information (4 marks)
4.
a) Describe the following with diagrams :
(i) Bus Topology
(ii) Tree Topology
(iii) Star Topology
(3 marks each)
b) Outline the three (3) types of keys in cryptograph (3 marks)
5.
a) Write short notes on the following:
(i) Simplex
(ii) Half- Duplex
(iii) Full – Duplex
(2 marks each)
b) List and explain two (2) types of connection (3 marks)
c) What is OSI model (3 marks)
6.
a) Outline five (5) types of topology (5 marks)
b) Explain Cryptography algorithms, Use the shift cipher with key = 12 to encrypt the message “HELLO.” (4 marks)
c) Write short notes on the following
(i) LAN
(ii) WAN
(ii) Wireless
(3 marks each)
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
