KNEC Diploma in ICT Module 1 Operating Systems past paper: July 2019 Answers

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Course Name:  Information and Communication Technology
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Course Level:  Diploma
Sub Level:       Module I
Course Unit:   Operating Systems
Exam body:    KNEC
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Outline three disadvantages of serial file organization ()

Deﬁne the term port as used in I/O devices ()

Access Control Matrix shows the types of access that each user has in a file system. Outline ﬁve types of access used in a ﬁle system. ()

Outline two typical characteristics of cache memory ()

Differentiate between interrupt handler and interrupt vector as used in I/O communications ()

With the aid of a diagram, describe a page table as used in operating systems. ()

Explain the term compaction as used in memory fragmentation ()

List four factors that should be considered when selecting random access memory (RAM) for a computer, other than cost ()

With the aid of a diagram, describe three states process model in a used in operating system ()

10.

Joan intends to design a job scheduling algorithm. Explain two objectives that should be achieved by the algorithm ()

11.

12.

Outline three resources required in process execution ()

13.

Gerald was required to highlight principles of memory management in operating systems in a job interview. Outline four principles that he could have highlighted. ()

14.

Paul investigated the disadvantages of a contiguous ﬁle allocation method. Outline five disadvantages that he could have established ()

15.

File recovery is a critical feature in a ﬁle system. Explain two functions of this feature ()

16.

The principle goal of a multiprocessor system is to balance the load between processors. Explain two load balancing strategies used by these systems ()

17.

Explain the term virtual address space (VAS)as used in memory management ()

18.

Differentiate between static and dynamic linking as used in memory management ()

19.

The system timer is important in the multiprogramming of systems. Explain two roles of the timer ()

20.

Tony was required to conﬁgure buffering in an operating system that he was installing to a client. Explain three types of buffering he could use ()

21.

A lecturer described different categories of system calls in a lesson on operating systems. Outline four categories of system calls that he could have mentioned. ()

22.

Outline two beneﬁts of a microkernel operating systems ()

23.

Differentiate between blocking and non-blocking I/O ()

24.

Deﬁne the term segment table as used in operating systems ()

25.

Explain three limitations of a best-ﬁt memory placement algorithm ()

26.

Patricia was required to describe advantages of distributed operating systems to a client. Describe three advantages that she could have mentioned to the client ()

27.

Figure l shows a cross section of a hard disk. Explain the function of the parts labeled (i) and (ii). ()

28.

Explain two circumstances under which preemptive job scheduling algorithms would be used in operating systems ()

29.

I/O disk read operation involves several interrupts. Explain two typical interrupts that are likely to be used ()

30.

Describe two categories of l/O devices giving two examples in each ease. ()

31.

File sharing technologies have promoted the concept of global village. Explain two ﬁle sharing technologies that are used. ()

32.

Explain each of the following terms as used in operating systems: i) shell ii) Thread (i) shell; ()

33.

Doreen discovered that some of her ﬁlm in her computer were encrypted and her computer prompted her to pay a certain fee through internet in order to decrypt her ﬁles. (i)Identify the most appropriate type of attack justifying your answer. (ii)Outline four possible causes for the attack identiﬁed in (i). ()

34.

Explain the term spatial locality as used in memory management. ()

35.

Differentiate between long-term scheduler and short-term scheduler. ()

36.

Memory fragmentation is not popular with the modern operating systems. Explain two limitations that could be aiding this trend ()

37.

Outline two functions of device drivers in I/O communication ()

38.

Outline four conditions necessary for deadlock in computing ()

39.

Differentiate between high level and low level formatting as used in storage disks ()

40.

For each of the following scenario, identify the appropriate type of computer memory: (i) highly volatile; (1 mark) - Random access memory (ii) stores ﬁrmware; (l mark) - Read Only Memory (ROM) (iii) parts of hard disk addressed as computer memory; (l mark) - Virtual Memory. (iv) very short access time and suitable for storage of frequently used instructions by CPU. (l mar ()

41.

Creation of processes is a fundamental role of operating systems. Explain three ways of creating the processes ()