NATIONAL OPEN UNIVERSITY OF NIGERIA
14-16 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS
SCHOOL OF SCIENCE AND TECHNOLOGY
MARCH/APRIL 2015 EXAMINATION
COURSE CODE: CIT 723
COURSE TITLE: OPERATING SYSTEM DESIGN AND PROGRAMMING
Instruction: Answer any five questions each question carries 14 marks Time: 2½ hours
- (a) Define Operating System
(b) Mention three service levels offered by operating systems in Controlling Computer resources.
(c) Enumerate briefly the importance of the Kernel Service as part of the support of the Operating System
- (a) Operating System is said to be a resource manager. List four hardware resources operating system effectively manages.
(b) Mention four functions of operating system as offered to computer system.
- (a) The broad category of operating systems are essentially classified into two. Name them.
(b) Discuss briefly on the following categories of operating systems:
(i) Single-User (Multi-tasking system)
(ii) Multi-User operating system.
- List four qualities of operating systems and discuss any three of the listed qualities.
- (a) List five basic functions of an operating systems.
(b) Write briefly on the following basic services of operating systems:
(i) Input/output operations
(ii) Program Execution
- (a) What does acronym OSI stands for?
(b) Mention the seven layers of the OSI Reference Model from the top layer.
(c) Describe briefly the function of the Application Layer of the OSI reference model.
- (a) What is Computer Security? State briefly the three core areas of Computer Security.
(b) Write briefly on the following Windows NT Server Permissions:
(i) Read
(ii) Execute
(iii) Write
(iv) No Access
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