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NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
OCTOBER 2019 EXAMINATION
COURSE CODE: CIT 311
COURSE TITLE: COMPUTER NETWORKS
CREDIT: 3 UNITS
TIME ALLOWED: 2½ HOURS
INSTRUCTION: ANSWER QUESTION 1 AND ANY OTHER FOUR (4) OTHER
QUESTIONS
1a. (i) Evaluate and Classify Computer Networks (8 marks)
1b. (i) Determine the characteristics of broadband coaxial cable (5marks)
(ii) Analyse Data Link Layer Link Control) (3marks)
1c. (i) Write on the Services Provided by Data Link Layer (3marks)
1c. (ii) Analyse the basic designed goals of network layer services (3marks)
2. Evaluate the types of Service/Quality of Service (QoS) (6 marks)
2b. Write out the PseudoCode for Source Routing Bridges (6 marks)
3a. Analyse the concept of file transfer protocol? [6 marks]
3b. Distinguish between adaptive and non-adaptive routing [4 marks]
3c. Determine three advantages of transparent bridges [2 marks]
4a. Describe three (3) commonest problems that can occur with RIP (3 marks)
4b. Give any 6 Characteristics of Electronic Mail (E-MAIL) (6 marks)
4c. Explain what you understand by the term RIP used in computer networks (3mark)
5a. Distinguish between bridges and routers (6 marks)
5b. Discuss three basic operations of an ATM switch [3 marks]
5c. Analyse any three (3) tasks which can be performed by a modem [3marks]
6a. Differentiate between ISO reference model and TCP reference model (6 marks)
6b. Describe the concept of user data protocol [6marks]
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