NATIONAL OPEN UNIVERSITY OF NIGERIA
14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS
SCHOOL OF SCIENCE AND TECHNOLOGY
MARCH/APRIL 2014 EXAMINATION
COURSE CODE: CIT 722
COURSE TITLE: COMPUTER NETWORKS
TIME ALLOWED: 3HOURS
INSTRUCTION: Answer Any Five Questions
1a. What do you understand by network topology? 4 marks
b. What is Multiplexing? 4 marks
c. Name the three categories of Multiplexing 3 marks
d. Distinguish between Time and Latency? 3 marks
2a. What is Protocol. 2 marks
b. Explain the key elements of a protocol. 9 marks
c. What is the advantage of token passing protocol over CSMA/CD protocol? 3 marks
3a. List and explain types of networks? 10 marks b. What protocol is used by DNS name servers? 4 marks
4a. Explain IP addressing 6 marks
b. List the two IP addressing schemes 4 marks
c. What is addressing designed to achieve? 4 marks
5a. List the layers of OSI Model 4 marks
b. At which layer of the OSI Model are network support layers? 3 marks
c. What are the two types of transmission technology available? 2 marks
d. What is subnet? 2 marks
e. Differentiate between communication and transmission? 3 marks
6a. State the possible ways of data exchange. 3 marks
b. Distinguish between NETBIOS and NETBEUI. 5 marks
c. What is a MAC address? 3 marks
d. Differentiate between bit rate and baud rate. 3 marks
7. Briefly discuss four different types of networking / internetworking devices. 14marks
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Exam summary sample below
