DOS_Quiz

If timestamps of two events are same, then the events are

• concurrent

• non-concurrent

• monotonic

• non-monotonic

If a process is executing in its critical section

• any other process can also execute in its critical section

• no other process can execute in its critical section

• one more process can execute in its critical section

• none of the mentioned

What is common problem found in distributed system ?

• Process Synchronization

• Communication synchronization

• Deadlock problem

• Power failure

A process can enter into its critical section

• anytime

• when it receives a reply message from its parent process

• when it receives a reply message from all other processes in the system

• none of the mentioned

For proper synchronization in distributed systems

• prevention from the deadlock is must

• prevention from the starvation is must

• prevention from the deadlock & starvation is must

• none of the mentioned

In the token passing approach of distributed systems, processes are organized in a ring structure

• logically

• physically

• both logically and physically

• none of the mentioned

According to the ring algorithm, links between processes are

• Bidirectional

• Unidirectional

• Both bidirectional and unidirectional

• None of the mentioned

What are the characteristics of mutual exclusion using centralized approach?

• One processor as coordinator which handles all requests

• It requires request, reply and release per critical section entry

• The method is free from starvation

• All of the mentioned

Single coordinator approach has the following advantages:

• Simple implementation

• Simple deadlock handling

• Bottleneck

• All of the mentioned

Which are the two complementary deadlock-prevention schemes using time stamps ?

• The wait-die & wound-wait scheme

• The wait-n-watch scheme

• The wound-wait scheme

• The wait-wound & wound-wait scheme