Quiznetik

Distributed Computing System (DCS) | Set 1

1. A distributed system is defined as a collection of autonomous computers linked by a network with software designed to produce an integrated computing facility.

A. true

B. false

Correct : A. true

2. A “glue” between client and server parts of application

A. middleware

B. firmware

C. package

D. system software

Correct : A. middleware

3. The hardware of DS has two types

A. multiprocessor system,multicomputer system

B. multiprocessor system,unicomputer system

C. uniprocessor system,multicomputer system

D. uniprocessor system,unicomputer system

Correct : A. multiprocessor system,multicomputer system

4. Process Fail - Stop in process omission faults

A. can be detected in synchronous system.

B. can be detected in asynchronous system.

C. can be detected in synchronous and asynchronous system.

D. can be detected in standalone system.

Correct : A. can be detected in synchronous system.

5. Distributed pervasive system is also known as

A. ubiquitous computing

B. user interface design

C. graphical user interface

D. peer to peer system

Correct : A. ubiquitous computing

6. Type of cluster computing is

A. load sharing cluster

B. load holding cluster

C. load replication cluster

D. load balancing cluster

Correct : D. load balancing cluster

7. Type of grid computing is

A. collaborative grid

B. system grid

C. process grid

D. channel grid

Correct : A. collaborative grid

8. Scaling transparency hides

A. system expansion

B. system collaboration

C. system failure

D. system security

Correct : A. system expansion

9. Internet provides for remote login.

A. telnet

B. http

C. ftp

D. rpc

Correct : A. telnet

10. The header usually consists of the following elements in IPC I. Sequence number II. Structural information III. Address IV. File mode(Read/ Write)

A. i,iii, iv

B. i,ii, iii

C. i, ii, iv

D. i,iv

Correct : B. i,ii, iii

11. In RMI, the objects are passed by .

A. value

B. reference

C. value and reference

D. object

Correct : A. value

12. What are the exceptions which have to be handled in a RMI client program?

A. malformedurlexception

B. notfoundexception

C. arithmeticexception

D. class•not•found•excepti on

Correct : A. malformedurlexception

13. Transient communication done by layer

A. network

B. transport

C. physical

D. session

Correct : B. transport

14. The local operating system on the server machine passes the incoming packets to the

A. server stub

B. client stub

C. client operating system

D. binding agent

Correct : A. server stub

15. Machine that places the request to access the data is generally called as .

A. server machine

B. client machine

C. request machine

D. database server

Correct : B. client machine

16. provides programmers a familiar programming model by extending the local procedure call to a distributed environment

A. distributed environment

B. permanent procedure call

C. process and file

D. remote procedure call

Correct : D. remote procedure call

17. An architecture where clients first communicate the server for data then format and display it to the users, is known as

A. client/server architecture

B. three-tier architecture

C. two-tier architecture

D. peer-to-peer architecture

Correct : A. client/server architecture

18. is an object acting as a gateway for the client side.

A. skeleton

B. stub

C. remote

D. server

Correct : B. stub

19. Message passing provides a mechanism to allow processes to communicate and to synchronize their actions

A. by sharing the same address space

B. without sharing the same address space

C. by sharing the same process number and process identifier

D. by sharing port number

Correct : A. by sharing the same address space

20. Which of the following allocates/deallocates buffers

A. rrl

B. stub/skeleton layer

C. transport layer

D. networking layer

Correct : A. rrl

21. OSI stands for

A. open system interconnection

B. operating system interface

C. optical serviceimplementation

D. open service internet

Correct : A. open system interconnection

22. Which address is used to identify a process on a host by the transport layer?

A. physical address

B. logical address

C. port address

D. specific address

Correct : C. port address

23. In all reliable multicast group communication

A. n\ response expected from the receiver

B. response from any of the receiver required

C. response from \m\(1<m<n) of the \n\ receiver required

D. response needed from all the receivers

Correct : D. response needed from all the receivers

24. If processes p and q both receive messages m and m', then p receives m before m' if and only if q receives m before m'.The order delivery is called

A. absolute ordering

B. consistent ordering

C. causal ordering

D. fifo ordering

Correct : B. consistent ordering

25. What is close group in group communication?

A. only members can send messages to the group as a whole

B. processes that are not members (clients) can send message to the group.

C. the idea of groups is to support replicated servers

D. processes that are not members (clients) but close to the group can send message to the group.

Correct : A. only members can send messages to the group as a whole

26. all related objects moved and left to a server upon the first RPC

A. call by value

B. call by move

C. call by visit

D. call by reference

Correct : B. call by move

27. What is the feature of stateful server?

A. longer server recovery time

B. quick recovery after reboot

C. file operations must be idempotent

D. simple server design

Correct : A. longer server recovery time

28. is a process that prevents multiple threads or processes from accessing shared resources at the same time.

A. critical section

B. deadlock

C. message passing

D. mutual exclusion

Correct : D. mutual exclusion

29. Absolute time synchronization can be achieved using

A. vector time stamping method

B. christian’s method

C. lamport’s method

D. ricart-agrawala algorithm

Correct : B. christian’s method

30. Which mutual exclusion algorithm is useful when the membership of the group is unknown?

A. centralized

B. lamport’s.

C. token ring

D. decentralized algorithm

Correct : A. centralized

31. Which event is concurrent with the vector clock (2, 8, 4)?

A. (3,9,5)

B. (3,8,4)

C. (1,7,3)

D. (4,8,2)

Correct : D. (4,8,2)

32. A client gets a timestamp of 4:12:30.500 from a time server. The elapsed time between the request and response was 20 msec (0.020 sec). The current time on the client is 4:12:30.510. Using Cristian’s algorithm, what is the time set to on the client?

A. 1970-01-01 04:12:30

B. 1970-01-01 04:12:30

C. 1970-01-01 04:12:32

D. 1970-01-01 04:12:32

Correct : C. 1970-01-01 04:12:32

33. NTP is layer protocol.

A. application

B. session

C. transport

D. physical

Correct : A. application

34. Which of the following is an example of election algorithm.

A. berkley algorithm:

B. bully algorithm.

C. cristian’s algorithm

D. lamport’s

Correct : B. bully algorithm.

35. For each critical section (CS) execution, Ricart-Agrawala algorithm requires messages per CS execution and the Synchronization delay in the algorithm is .

A. 3(n − 1), t

B. 2(n − 1), t

C. (n − 1), 2t

D. (n − 1), t

Correct : B. 2(n − 1), t

36. For each critical section (CS) execution, maekawa’s algorithm requires messages per CS execution and the Synchronization delay in the algorithm is .

A. √n , t

B. 2√n , t

C. 3√n , t

D. 3√n , 2t

Correct : D. 3√n , 2t

37. RAYMOND'S TREE BASED ALGORITHM is an

A. non- token based algorithm.

B. token based algorithm.

C. centralized based algorithm

D. physical clock synchronization algorithm.

Correct : B. token based algorithm.

38. Suzuki-Kasami's Broadcast Algorithm is an

A. non- token based algorithm.

B. token based algorithm.

C. centralized based algorithm

D. physical clock synchronization algorithm.

Correct : B. token based algorithm.

39. Full form of NTP is:

A. network time protocol

B. new time protocol

C. new timestamp protocol

D. network timestamp protocol

Correct : A. network time protocol

40. Which algorithm requires "1 to ∞" messages to enter and leave a critical region?

A. token ring algorithm

B. centralized algorithm

C. decentralized algorithm

D. distributed algorithm

Correct : A. token ring algorithm

41. Pretransfering also known as

A. premigrating

B. precopying

C. prefiltering

D. postcopying

Correct : B. precopying

42. change the state of thread from suspe

A. run()

B. yield()

C. destroy()

D. start()

Correct : D. start()

43. Distributed syatem consists of set of resour

A. printer

B. processor

C. cd

D. processes

Correct : B. processor

44. This is not feature of cooperative algorithm

A. complex

B. larger overhead

C. worst stability

D. better stability

Correct : C. worst stability

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

A. remote logging using ssh or telnet

B. zone are configured for automatic access

C. ftp is not used

D. ftp is used

Correct : A. remote logging using ssh or telnet

46. What are the characteristics of data migration?

A. transfer data by entire file or immediate portion required

B. transfer the computation rather than the data

C. execute an entire process or parts of it at different sites

D. execute an entire process or parts of it at same site

Correct : A. transfer data by entire file or immediate portion required

47. What are the characteristics of computation migration?

A. transfer data by entire file or immediate portion required

B. transfer the computation rather than the data

C. execute an entire process or parts of it at different sites

D. execute an entire process or parts of it at same site

Correct : B. transfer the computation rather than the data

48. What are the characteristics of process migr

A. transfer data by entire file or immediate portion required

B. transfer the computation rather than the data

C. execute an entire process or parts of it at different sites

D. execute an entire process or parts of it at same site

Correct : C. execute an entire process or parts of it at different sites

49. When the process issues an I/O request

A. it is placed in an i/o queue

B. it is placed in a waiting queue

C. it is placed in the ready queue

D. it is placed in the job queue

Correct : A. it is placed in an i/o queue

50. Absolute time ordering of all shared accesses matters in

A. sequential consistency

B. casual consistency

C. strict consistency

D. weak consistency

Correct : C. strict consistency

51. In Casual consistency model all processes shared accesses in

A. random order

B. same order

C. sequential order

D. specific order

Correct : B. same order

52. In which of the following consistency model all writes become perceptible to all processes

A. strict

B. weak

C. casual

D. sequential

Correct : A. strict

53. consistency is that write operations by the same process are performed in the correct order everywhere.

A. weak

B. strict

C. eventual

D. fifo

Correct : D. fifo

54. Any successive write operation by a process on a data item x will be performed on a copy of x that is up to date with the value most recently read by that process.

A. monotonic-write

B. writes follows reads

C. read your writes

D. monotonic-read

Correct : B. writes follows reads

55. replicas are used only to improve access time on data

A. client initiated

B. server initiated

C. permanent

D. dynamic

Correct : A. client initiated

56. In receivers never acknowledge the successful delivery of multicast message but instead report only when missing the message.

A. basic reliable multicasting

B. non-hierarchical feedback control

C. hierarchical feedback control

D. atomic multicast

Correct : B. non-hierarchical feedback control

57. A problem with the protocol is that when the coordinator has crashed, participants may not be able to reach a final decision.

A. one-phase commit

B. three-phase commit

C. two-phase commit

D. virtual synchrony

Correct : C. two-phase commit

58. Optimistic logging protocols need to keep track of

A. independencies

B. checking points

C. dependencies

D. erroneous state

Correct : C. dependencies

59. Processor Consistency model guarantees and conforms that

A. all write accomplished on identical memory location in identical sequence.

B. all write accomplished on random memory location in random sequence

C. all write accomplished on random memory location in identical sequence

D. all write accomplished on identical memory location in random order

Correct : A. all write accomplished on identical memory location in identical sequence.

60. Staleness deviations relate to the a replica was updated.

A. first time

B. most recent time

C. last time

D. previous time

Correct : C. last time

61. The dynamic replication algorithm takes into account

A. to reduce load on server

B. files on server can be migrated anywhere

C. schedule process migration

D. resource sharing

Correct : A. to reduce load on server

62. To improve performance, many distributed systems

A. combine check pointing with recovery oriented computing

B. combine check pointing with message logging

C. combine check pointing with distributed commit

D. combine distributed commit with message logging.

Correct : B. combine check pointing with message logging

63. File Replication is done to

A. increase complexity

B. increase cost

C. increase reliability

D. increase data

Correct : C. increase reliability

64. in NFS which funtion is used for creating new file?

A. open()

B. create()

C. develope()

D. null()

Correct : B. create()

65. which command is used to create a directory

A. rmdir

B. symlink

C. mkdir

D. open

Correct : C. mkdir

66. datanodes and namenode are two elements of which file system?

A. afs

B. hdfs

C. nfs

D. none of the above

Correct : B. hdfs

67. In which file system mapreduce function is used?

A. afs

B. nfs

C. hdfs

D. none of the above

Correct : C. hdfs

68. In distributed file system, DNS stands for?

A. domain name system

B. domain name server

C. directory name service

D. disk name system

Correct : A. domain name system

69. NFS file System uses Mechanism

A. rpc

B. corba

C. rmi

D. none of the above

Correct : A. rpc

70. map and reduce are

A. libraries

B. functions

C. file system

D. os

Correct : B. functions

71. In HDFS file System, A serves as the master and there is only one NameNode per cluster

A. data node

B. namenode

C. replication

D. data block

Correct : B. namenode

72. HDFS works in a fashion.

A. master-master

B. master-slave

C. slave-slave

D. none of the above

Correct : B. master-slave

73. In HDFS file System, NameNode is used when the Primary NameNode goes down.

A. rack

B. data

C. secondary

D. primary

Correct : C. secondary

74. In context of HDFS file system, Point out the wrong statement.

A. replication factor can be configured at a cluster level (default is set to 3) and also at a file level

B. block report from each datanode contains a list of all the blocks that are stored on that datanode

C. user data is stored on the local file system of datanodes

D. datanode is aware of the files to which the blocks stored on it belong to

Correct : D. datanode is aware of the files to which the blocks stored on it belong to

75. In HDFS, . is the slave/worker node and holds the user data in the form of Data Blocks.

A. datanode

B. namenode

C. data block

D. replication

Correct : A. datanode

76. In distributed file system,XDR stands for?

A. external data request

B. external device request

C. external data recovery

D. external data representation

Correct : D. external data representation

77. If file system is growing without affecting performance of the system then this feature is called as?

A. union

B. portable

C. robust

D. scalability

Correct : D. scalability

78. Storing file in makes it permanently available

A. secondary memory

B. ram

C. register

D. dram

Correct : A. secondary memory

79. Session file sharing semantics are suitable for caching

A. complete folder

B. complete file

C. one byte

D. one block

Correct : B. complete file

80. Network file system(NFS) is developed by?

A. sun microsystem

B. oracle

C. apple

D. honeywell

Correct : A. sun microsystem

81. The file once created can not be changed is called

A. rigid file

B. rex file

C. immutable file

D. robust file

Correct : C. immutable file

82. Remote Procedure Calls are used ____________

A. for communication between two processes remotely different from each other on the same system

B. for communication between two processes on the same system

C. for communication between two processes on separate systems

D. none of the mentioned

Correct : C. for communication between two processes on separate systems

83. To differentiate the many network services a system supports ______ are used.

A. variables

B. sockets

C. ports

D. service names

Correct : C. ports

84. RPC provides a(an) _____ on the client side, a separate one for each remote procedure.

A. stub

B. identifier

C. name

D. process identifier

Correct : A. stub

85. What is stub?

A. transmits the message to the server where the server side stub receives the message and invokes procedure on the server side

B. packs the parameters into a form transmittable over the network

C. locates the port on the server

D. all of the mentioned

Correct : D. all of the mentioned

86. To resolve the problem of data representation on different systems RPCs define _____________

A. machine dependent representation of data

B. machine representation of data

C. machine-independent representation of data

D. none of the mentioned

Correct : C. machine-independent representation of data

87. What is the full form of RMI?

A. remote memory installation

B. remote memory invocation

C. remote method installation

D. remote method invocation

Correct : D. remote method invocation

88. The remote method invocation __________

A. allows a process to invoke memory on a remote object

B. allows a thread to invoke a method on a remote object

C. allows a thread to invoke memory on a remote object

D. allows a process to invoke a method on a remote object

Correct : B. allows a thread to invoke a method on a remote object

89. A process that is based on IPC mechanism which executes on different systems and can communicate with other processes using message based communication, is called ________

A. local procedure call

B. inter process communication

C. remote procedure call

D. remote machine invocation

Correct : C. remote procedure call

90. What is not true about a distributed system?

A. it is a collection of processor

B. all processors are synchronized

C. they do not share memory

D. none of the mentioned

Correct : B. all processors are synchronized

91. What are the characteristics of a distributed file system?

A. its users, servers and storage devices are dispersed

B. service activity is not carried out across the network

C. they have single centralized data repository

D. there are multiple dependent storage devices

Correct : A. its users, servers and storage devices are dispersed

92. What is not a major reason for building distributed systems?

A. resource sharing

B. computation speedup

C. reliability

D. simplicity

Correct : D. simplicity

93. What is a stateless file server?

A. it keeps tracks of states of different objects

B. it maintains internally no state information at all

C. it maintains some information in them

D. none of the mentioned

Correct : B. it maintains internally no state information at all

94. What are the characteristics of the stateless server?

A. easier to implement

B. they are not fault-tolerant upon client or server failures

C. they store all information file server

D. they are redundant to keep data safe

Correct : A. easier to implement

95. What are the advantages of file replication?

A. improves availability & performance

B. decreases performance

C. they are consistent

D. improves speed

Correct : A. improves availability & performance

96. What are characteristic of NFS protocol?

A. search for file within directory

B. read a set of directory entries

C. manipulate links and directories

D. all of the mentioned

Correct : D. all of the mentioned

97. What is the coherency of replicated data?

A. all replicas are identical at all times

B. replicas are perceived as identical only at some points in time

C. users always read the most recent data in the replicas

D. all of the mentioned

Correct : D. all of the mentioned

98. The file once created can not be changed is called ___________

A. immutable file

B. mutex file

C. mutable file

D. none of the mentioned

Correct : A. immutable file

99. ______ of the distributed file system are dispersed among various machines of distributed system.

A. clients

B. servers

C. storage devices

D. all of the mentioned

Correct : D. all of the mentioned

100. _______ is not possible in distributed file system.

A. file replication

B. migration

C. client interface

D. remote access

Correct : B. migration