National Open University of Nigeria, University Village Plot 91 Cadastral Zone,
Nnamdi Azikiwe Express Way, Jabi, Abuja
Faculty of Sciences
CIT 303: PRINCIPLES OF COMMUNICATION TECHNOLOGY – (3 Credits)
Answer Question one (1) and four (4) other questions in 21/2 Hours.
Total of 70, Question 1 is 22 marks and others 12 marks each
1(a) Explain Data Communication and outline and explain their features. (5 marks)
1(b) Describe an Encryption and Decryption? (3 marks)
1(c ) Outline and explain three Network criteria (3 marks)
1(d) Outline four (4) basic networking devices. (4 marks)
1(e) Differentiate between Symmetric-Key Cryptography and symmetric-Key Cryptography
4 marks)
1(f) List three broad groups of wireless transmission: radio
waves, microwaves, and infrared waves (3 marks)
2 (a). Describe with diagram the components of data communication (4 marks)
2(b) What is a protocol and list its key elements (4 marks)
2(b) List and explain different forms of information (4 marks)
3(a) Describe the following with diagrams :
(i) Bus Topology
(ii) Tree Topology
(iii) Star Topology
(3 marks each)
3(b) Outline the three (3) types of keys in cryptograph (3 marks)
4(a).Write short notes on the following:
(i) Simplex
(ii) Half- Duplex
(iii) Full – Duplex
(3 marks each)
4(b) 4(b) List and explain two (2) types of connection ( 3 marks)
5.(a) What is OSI model ? (3 marks)
5(b) Outline five (5) types of topology (5 marks)
5 ( c) Explain Cryptography algorithms, Use the shift cipher with key = 12 to encrypt the message “HELLO.” (4 marks)
.
6 (a) Distinguish between Analog Signal processing and Digital Signal processing (3 marks)
6 (b) 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
