NATIONAL OPEN UNVERSITY OF NIGERIA
University Village, Plot 91, Cadastral Zone,
Nnamdi Azikiwe Expressway, Jabi, Abuja
FACULTY OF SCIENCES
Course Code: CIT722 Time Allowed: 21/2 Hours
Course Title: Computer Networks
Course Credit Unit: 3
Instruction: Answer Question 1 (22 marks) and any other four questions (12 marks each)
1(a) Compare and contrast the functions of Carrier Sense on Multi-Access Networks (CSMA) and Carrier Sense Multiple Access with Collision Detect (CSMA/CD). (4 marks)
1(b) In trouble shooting a network, what are the possible reasons why a network may be dysfunctional (5 marks)
1(c) Differentiate between simplex and full-duplex modes of data transmission (2 marks)
1(d) what are the major disadvantages of a physically direct-wired LAN? (4 marks)
1 (e) How can a star-wired LAN remedy the disadvantages in 1 (d). (2 marks)
1(f) Mention four benefits of asynchronous transfer mode (4 marks)
2. (a) Describe specifically the three major categories of computer networks (6 marks)
2. (b) Choosing a network topology is critical to the functionality of the network discuss the factors that influence the choose of network topology. (6 marks)
3 (a) Elucidate on the concept of Protocol highlighting its key elements. (7 marks)
(b) Write on the workings of TCP/IP model (5 marks)
4 (a) Describe the concepts Time-Domain and Frequency Domain (6 marks)
(b) What is Network addressing? (3 marks)
(c) Define Private IP Addresses (3 marks)
5 (a) Outline the guide lines to employ when installing a cable (5marks)
(b) List and explain the seven layers of the OSI model (7 marks)
6 (a) Elucidate on Circuit switching and Block switching (6 marks)
(b) Contrast between;
i) LAN (2 marks)
ii) MAN (2 marks)
iii) WAN (2 marks)
You can get the soft copy for this course or the exam summary answers for this course from 08039407882
Exam summary sample below
