Question 1. (40 marks) (a). Explain the TWO Key objectives of the ISO, OSI model and distinguish between 'Closed system'

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Question 1 40 Marks A Explain The Two Key Objectives Of The Iso Osi Model And Distinguish Between Closed System 1 (34.23 KiB) Viewed 3 times

Question 1 40 Marks A Explain The Two Key Objectives Of The Iso Osi Model And Distinguish Between Closed System 2 (50.86 KiB) Viewed 3 times

Question 1. (40 marks) (a). Explain the TWO Key objectives of the ISO, OSI model and distinguish between 'Closed system' and 'Open system with reference to computer Network communications (10marks) (b). Explain the need for an 'Operating system' in a digital computer system and show the difference between Real-time operating system and Time-sharing operating system (10marks) Branch P Window O/S Branch Q Linux O/S Branch R Unix O/S CENTRIC Company-Lad Network Branch S MAC O/S FIG. I Computer Network for Centric-Ltd (c). The diagram in fig. 1 above represents the computer network connecting the four branches (P, Q, R, and S) of CENTRIC Company-Ltd. (1) Describe the issues that arise when different operating systems are interconnected in such a network. (10marks) EXAMINER: MR. B. S. K. WIREDU Page 5 of 7 101. (ii) Discuss the Impact of the ISO, OSI model on the company's network (10 marks) communication.

(a) Explain the 'Process Concept' and 'Process State'. (6marks) (b) 'It is important to have a good understanding of the computer hardware before the study of operating systems' Discuss. (3marks) (c) With the aid of the Seven state transition diagram, describe how a process goes through these transitions, stating clearly, the conditions that must be satisfied for a process to make a transition. (10marks) (d) Describe the round-robin job scheduling algorithm and its advantages over other such schemes (2marks) (e) Table 1 below shows six processes and their individual arrival times at the CPU for execution. PROCESS ARRIVAL CPU TIME TIME PI 5 P2 2 P3 3 7 P4 S 1 PS 7 4 P6 8 Table 1: Six process and their arrival times at the CPU Using the round robin scheduling algorithm with a time quantum of 3, i. Draw a Gantt chat showing how the processes arrive in memory ii. Calculate the waiting time for the six processes. (4marks) (12marks) (3marks) iii. Calculate the average waiting time and state its significance QUESTION 3 (40marks). Operating System may be defined as the Software that manages the Resources of the computer system. Explain in Detail, how an Operating system of your choice manages TWO of the following resources. (a) Input and Output (1/0) (20marks) (b) Main Memory (20marks) (c) Files and Data. (20marks) 6 1