BCA211 - Operating System

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BACHELOR OF COMPUTER APPLICATIONS (BCA)

SEMESTER - II

SUBJECT CODE & NAME

BCA211 - Operating System

Q1. What are the components of UNIX Kernel? 10

Answer. The UNIX kernel s divided in to three modes: user mode, kernel mode, and hardware. The user mode contains user programs

Q2. Discuss First-Come-First-Served scheduling algorithm. 10

Answer. This is one of the brute force algorithms. A process that requests for the CPU first is allocated the CPU first. Hence, the name first come first serve.  The FCFS algorithm is implemented by using a first-in-first-out (FIFO) queue structure

Q3. a) What are the necessary conditions for deadlock to occur?

b) Write a note on Resource Allocation Graph. 4+6

 Answer. a) A deadlock occurs in a system if the following four conditions hold simultaneously:

1)      Mutual exclusion:

Set - 2

Q1. Discuss the concept of Direct Memory Access.  10

Answer. In most mini and mainframe computer systems, a great deal of input and output occurs between the disk system and the processor. It would be very inefficient to perform these operations directly through the processor;

Q2. Explain demand paging in virtual memory system.  10

Answer. Demand paging is similar to paging with swapping (Refer figure below). When a process is to be executed then only that page of the process, which needs to be currently executed, is swapped into memory. Thus, only necessary pages

Q3. What are the different forms of Encryption in Distributed System? 10

Answer. Encryption in a distributed environment can be of two forms:

 • End-to-end encryption

• Link encryption

 If end-to-end

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