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Round Robin - Operating Systems - Old Exam, Exams of Operating Systems

Dr. Bhim Rao Ambedkar UniversityOperating Systems

These are the Old Exam of Operating Systems which includes Secrecy of Users, Passwords, Environmental Variable Path, Partitioning a Disk, Criteria for File Organisation etc. Key important points are: Round Robin, Convenient Environment, Program Development, Non-Contiguous File Allocation, Hard Link, Soft Link, File Directories, Shortest Job First, Priority Scheduling, Round Robin

Typology: Exams

2012/2013

Uploaded on 03/25/2013

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Cork Institute of Technology
Higher Certificate in Computing in Information Technology
Support - Stage 1
(NFQ – Level 6)
Spring 2006
Operating Systems
(Time: 2 Hours)
Instructions:
Answer any four questions
All questions carry equal marks
Examiners: Mrs Gemma O’Callaghan
Mr. James Greenslade
Question 1:
(a) What is an operating system? What is its purpose? ` (6 marks)
(b) Describe the tasks that each subsystem manager within an operating system must perform.
(8 marks)
(c) “System programs provide a more convenient environment for program development and
execution. Some of them are simply user interfaces to system calls, whereas others are
considerably more complex. They can be divided into several categories.”
Describe 4 categories of system programs. (8 marks)
(d) What is the kernel in relation to operating systems? (3 marks)
Question 2:
(a) Describe some of the responsibilities that a file system must undertake. (8 marks)
(b) Describe how Linked-list Non-contiguous File Allocation works. (8 marks)
(c) Describe how Indexed Non-contiguous File Allocation works. (7 marks)
(d) What is the difference between a hard link and a soft link in relation to file directories?
(2 marks)
pf2

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Cork Institute of Technology

Higher Certificate in Computing in Information Technology

Support - Stage 1

(NFQ – Level 6)

Spring 2006

Operating Systems

(Time: 2 Hours)

Instructions: Answer any four questions All questions carry equal marks

Examiners: Mrs Gemma O’Callaghan Mr. James Greenslade

Question 1: (a) What is an operating system? What is its purpose? ` (6 marks) (b) Describe the tasks that each subsystem manager within an operating system must perform. (8 marks) (c) “System programs provide a more convenient environment for program development and execution. Some of them are simply user interfaces to system calls, whereas others are considerably more complex. They can be divided into several categories.” Describe 4 categories of system programs. (8 marks) (d) What is the kernel in relation to operating systems? (3 marks)

Question 2: (a) Describe some of the responsibilities that a file system must undertake. (8 marks) (b) Describe how Linked-list Non-contiguous File Allocation works. (8 marks) (c) Describe how Indexed Non-contiguous File Allocation works. (7 marks) (d) What is the difference between a hard link and a soft link in relation to file directories? (2 marks)

Question 3: (a) Describe, using an example, the following CPU Scheduling algorithms:

  1. Shortest Job First
  2. Priority Scheduling
  3. Round Robin (12 marks) (b) Discuss how indirect communication is implemented. (5 marks) (c) What is a PCB used for? Describe 4 pieces of information that is holds. (6 marks) (d) Explain two of the reasons as to why a parent process may terminate the execution of a child process. (2 marks)

Question 4: (a) In relation to Memory Management, how do Fixed Partitions work? (12 marks) (b) Show, using an example, how the best-fit and first-fit memory allocation schemes work. (8 marks) (c) Discuss how basic page replacement works. (5 marks)

Question 5: (a) Differentiate between the three different categories of system devices. (9 marks)

(b) Discuss the three factors that contribute to the time required to access a file. (6 marks) (c) Explain how the management of I/O requests are handled by the Device Manager. (10 marks)