Question 1
In distributed systems, rolling back one process can cause the roll back of other processes is called?
Select one:
a. Domino effect.
b. Deadlock.
c. Synchronization problem.
d. Concurrency problem.
The correct answer is: Domino effect.
Question 2
What is the solution for the problems of livelocks and domino effect?
Select one:
a. ALL.
b. Semaphores.
c. Mutual exclusion.
d. Consistent checkpoints.
The correct answer is: Consistent checkpoints.
Question 3
What is a log?
Select one:
a. None
b. saved state of a process.
c. Mutual exclusion method.
d. Deadlock prevention starategy.
The correct answer is: saved state of a process.
Question 4
What is Orphan message?
Select one:
a. Message which dont know receiver identity.
b. Message which dont know Sender identity.
c. A tuple message
d. All
The correct answer is: Message which dont know Sender identity
Question 5
Restoring processes to previous error-free state is called?
Select one:
a. Backward Recovery.
b. Mutual exclusion.
c. Forward recovery.
d. Both A & B.
The correct answer is: Backward Recovery.
Question 6
What is Write-ahead-log?
Select one:
a. Write logs before update.
b. Both.
c. None.
d. Write logs after update.
The correct answer is: Write logs before update.
Question 7
What are the different ways of maintaining consistency for replicated data?
Select one:
a. stop and wait.
b. All the above
c. circular wait.
d. Shared Lock.
The correct answer is: Shared Lock.
Question 8
What is a classical problem of synchronization?
Select one:
a. Readers and Writers Problem
b. Dining-Philosophers Problem
c. All the above
d. Bounded-Buffer Problem
The correct answer is: All the above
Question 9
Which one of the following technique is used for checkpointing?
Select one:
a. Write ahead log
b. logs.
c. All
d. Shadow paging.
The correct answer is: Shadow paging.
Question 10
What are the types of failures in distributed systems?
Select one:
a. All of the above
b. Communication failure
c. Process failure
d. System failure
The correct answer is: All of the above