Operating System MCQs

1019 MCQs  (Page 32 of 102)

Preemptive Shortest Job First scheduling is sometimes called ____________
A. Fast sjf scheduling
B. Edf scheduling €? earliest deadline first
C. Hrrn scheduling €? highest response ratio next
D. Srtn scheduling €? shortest remaining time next
An SJF algorithm is simply a priority algorithm where the priority is ____________
A. The predicted next cpu burst
B. The inverse of the predicted next cpu burst
C. The current cpu burst
D. Anything the user wants
Choose one of the disadvantages of the priority scheduling algorithm?
A. It schedules in a very complex manner
B. Its scheduling takes up a lot of time
C. It can lead to some low priority process waiting indefinitely for the cpu
D. None of the mentioned
What is ‘Aging’?
A. Keeping track of cache contents
B. Keeping track of what pages are currently residing in memory
C. Keeping track of how many times a given page is referenced
D. Increasing the priority of jobs to ensure termination in a finite time
What is the preferred way of encryption?
A. Pre shared secret key
B. Using key distribution center (kdc)
C. Public key-encryption
D. Symmetric key
What is not a role of encryption?
A. It is used to protect data from unauthorized access during transmission
B. It is used to ensure user authentication
C. It is used to ensure data integrity
D. It is used to ensure data corruption doesn’t happens
What is cipher-block chaining?
A. Data is logically €?anded’ with previous block
B. Data is logically €?ored’ with previous block
C. Data is logically €?xored’ with previous block
D. None of the mentioned