NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
SEPTEMBER 2020 EXAMINATION

COURSE CODE: CIT 305
COURSE TITLE: Networking and Communication Technology
CREDIT: 3 UNITS
TIME ALLOWED: 2 1/2 HOURS
INSTRUCTIONS: ANSWER QUESTION ONE (1) AND ANY FOUR (4) OTHERS

Question One:
1a. Outline and discuss any three of the five wireless technologies in use. (9marks)
1b. Write on the following:
i. Discuss briefly transmission impairment as relates to transmission medium... (2marks)
ii. Identify the four sources of transmission impairment. ( 2marks)
1c.i. What are the three common digital modulation techniques? (3marks)
ii. Evaluate on the advantages and disadvantages of Amplitude Shift Key (ASK). (4marks)
1d.i. Describe the term “Integrated Services Digital Network” (1mark)
ii. Compare ISDN over other digital communication technologies. (1mark)
 Total of 22mks

Question Two
2a. Briefly describe the following as relates to computer networking:
i. LAN (0.5mark)
ii. WAN (1mark)
iii. Backbone network (1mark)
2b. Describe the concept: telecommunication circuit. (1mark)
2c.i. Write short note on OSI model (1mk)
ii. The OSI reference model has seven layers: identify and describe the functions of any four of them. (7.5mks)

Question Three
3a. Identify the predefine enterprise networks that may be created upon installation.(1mark)
3b. Outline and discuss the four types of threat with respect to enterprise network.(3marks)

3c i. Identify the nine steps to effective network planning and design. (4.5marks)

ii. Summarize the design requirement process in network planning and design. (3.5 marks)

Question Four

4a. Identify the properties of digital information and explain any two briefly. (4.5 marks)

4b. Write short notes on the following:

i. Noise (0.5mark)

ii. Signal-to-noise ratio (S/N) (1mark)

4c. Identify the types of noise and discuss any two of them. (6marks)

Question Five

5a. Write on Bit Error Rate (BER). (3marks)

5b. Outline the six factors that affect BER. (6marks)

5c. Interpret the BER of 10-5 (3marks)

Question Six

6a. Evaluate packet switching as relates to computer networking. (4marks)

6b. Describe the concept”packets” based on the knowledge you have gotten from your course materials (4marks)
6c. Outline the weaknesses of packet switching. (4marks)