NATIONAL OPEN UNIVERSITY OF NIGERIA
PLOT 91, CADASTRAL ZONE, NNAMDI AZIKIWE EXPRESSWAY, JABI – ABUJA
FACULTY OF SCIENCES
JULY 2017 EXAMINATIONS
COURSE CODE: CIT722
COURSE TITLE: COMPUTER NETWORKS
CREDIT UNITS: 3
TIME ALLOTED: 2 HOURS, 30 MINUTES
INSTRUCTION:
Answer Question 1 and any other FOUR questions. Cordless nonprogrammable calculators may be used.
1.
a) Write short notes on the following:
i. Campus Area Network
ii. Metropolitan Area Network
iii. Wide Area Network (6 marks)
b) Distinguish between point-to-point and broadcast networks. (3 marks)
c) Name and describe three physical network topologies. (6 marks)
d) Explain what the OSI Reference model is, listing the layers in their proper order. (7 marks)
2.
a) Distinguish between Transmission Control Protocol (TCP) and User Datagram Protocol (UDP)
(6 marks)
b) Using three examples describe what a transmission medium is. (6 marks)
3.
a) Write a brief note on multiplexing, describing two techniques used to implement it. (6 marks)
b) Briefly explain what Media Access Control is listing two types of protocols used for it. (6 marks)
4.
a) Distinguish between adaptive and non-adaptive routing algorithms. (6 marks)
b) Write brief notes on each of the following:
i. Shortest Path routing
ii. Flooding (6 marks)
5.
a) Briefly explain the function of a Domain Name System (DNS) in a TCP/IP Network. (6 marks)
b) Write a brief note on each of the following:
i. Switch
ii. Bridge
iii. Hub
iv. Router (6 marks)
6.
a) Briefly explain what an ATM Network is listing four of its benefits. (6 marks)
b) Write a brief note on each of the following types of communication using examples to illustrate:
i. Baseband
ii. Broadband (6 marks)
You can get the soft copy for this course or the exam summary answers for this course from 08039407882
Exam summary sample below
