Operating System Practice Test 10

Question 1 of 20

1. Which one of the following is a distributed file system?

network file system

all of the mentioned

novel network

andrew file system

Question 1 of 20

Question 2 of 20

2. What are the parts of network structure?

All of the mentioned

Laptop

Gateway

Workstation

Question 2 of 20

Question 3 of 20

3. What are sites in network topology compared?

All of the mentioned

Basic cost

Communication cost

Reliability

Question 3 of 20

Question 4 of 20

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

physically

logically

both logically and physically

none of the mentioned

Question 4 of 20

Question 5 of 20

5. How is are collisions avoided in network?

Carrier sense with multiple access (CSMA); collision detection (CD)

Carrier sense multiple access with collision avoidance

All of the mentioned

Message slots

Question 5 of 20

Question 6 of 20

6. _______ is not possible in distributed file system.

Remote access

Migration

Client interface

File replication

Question 6 of 20

Question 7 of 20

7. What is the reacquisition scheme to revoke capability?

Indirect pointing is done to revoke object's capabilities

Master key can be used compare and revoke.

Pointers are maintained for each object which can be used to revoke

When a process capability is revoked then it won't be able to reacquire it

Question 7 of 20

Question 8 of 20

8. How is access to resources of various machines is done?

All of the mentioned

Zone are configured for automatic access

Remote logging using ssh or telnet

FTP is not used

Question 8 of 20

Question 9 of 20

9. Header are ______ when data packet moves from upper to the lower layers?

All of the mentioned

Modified

Removed

Added

Question 9 of 20

Question 10 of 20

10. Which technique is based on compile-time program transformation for accessing remote data in a distributed-memory parallel system?

remote procedure call

computation migration

cache coherence scheme

message passing

Question 10 of 20

Question 11 of 20

11. What are the advantages of file replication?

Improves availability & performance

They are consistent

Improves speed

Decreases performance

Question 11 of 20

Question 12 of 20

12. In a distributed file system, _______ is mapping between logical and physical objects.

heterogeneity

client interfacing

naming

migration

Question 12 of 20

Question 13 of 20

13. What are the characteristics of the stateless server?

They are redundant to keep data safe

Easier to implement

They are not fault-tolerant upon client or server failures

They store all information file server

Question 13 of 20

Question 14 of 20

14. What are the characteristics of mutual exclusion using centralized approach?

It requires request,reply and release per critical section entry

The method is free from starvation

All of the mentioned

One processor as coordinator which handles all requests

Question 14 of 20

Question 15 of 20

15. Which layer is the layer closest to the transmission medium?

Physical

Data link

Transport

Network

Question 15 of 20

Question 16 of 20

16. In distributed systems, election algorithms assumes that ____________

priority of the processes is not required

none of the mentioned

there is no priority number associated with any process

a unique priority number is associated with each active process in system

Question 16 of 20

Question 17 of 20

17. What is the main objective of protection?

Ensure that each object is accessed correctly and only by allowed processes

Objects have different priority and thus different levels of protection

None of the mentioned

Ensure all objects are protected individually

Question 17 of 20

Question 18 of 20

18. What are characteristic of NFS protocol?

Read a set of directory entries

Search for file within directory

All of the mentioned

Manipulate links and directories

Question 18 of 20

Question 19 of 20

19. What are the three popular semantic modes?

Session, Coherent semantics

Unix, Coherent & Session semantics

Unix, Transaction & Session semantics

Coherent, Transaction & Session semantics

Question 19 of 20

Question 20 of 20

20. Implementation of a stateless file server must not follow?

Encryption of keys

Cache consistency

Idempotency requirement

File locking mechanism

Question 20 of 20

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