McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Information Technology Engineering (IT) .
| 51. |
In Casual consistency model all processes shared accesses in |
| A. | random order |
| B. | same order |
| C. | sequential order |
| D. | specific order |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» C. two-phase commit | |
| 58. |
Optimistic logging protocols need to keep track of |
| A. | independencies |
| B. | checking points |
| C. | dependencies |
| D. | erroneous state |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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. |
| Answer» 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 |
| Answer» C. increase reliability | |
| 64. |
in NFS which funtion is used for creating new file? |
| A. | open() |
| B. | create() |
| C. | develope() |
| D. | null() |
| Answer» B. create() | |
| 65. |
which command is used to create a directory |
| A. | rmdir |
| B. | symlink |
| C. | mkdir |
| D. | open |
| Answer» C. mkdir | |
| 66. |
datanodes and namenode are two elements of which file system? |
| A. | afs |
| B. | hdfs |
| C. | nfs |
| D. | none of the above |
| Answer» B. hdfs | |
| 67. |
In which file system mapreduce function is used? |
| A. | afs |
| B. | nfs |
| C. | hdfs |
| D. | none of the above |
| Answer» 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 |
| Answer» A. domain name system | |
| 69. |
NFS file System uses Mechanism |
| A. | rpc |
| B. | corba |
| C. | rmi |
| D. | none of the above |
| Answer» A. rpc | |
| 70. |
map and reduce are |
| A. | libraries |
| B. | functions |
| C. | file system |
| D. | os |
| Answer» 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 |
| Answer» B. namenode | |
| 72. |
HDFS works in a fashion. |
| A. | master-master |
| B. | master-slave |
| C. | slave-slave |
| D. | none of the above |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» D. scalability | |
| 78. |
Storing file in makes it permanently available |
| A. | secondary memory |
| B. | ram |
| C. | register |
| D. | dram |
| Answer» A. secondary memory | |
| 79. |
Session file sharing semantics are suitable for caching |
| A. | complete folder |
| B. | complete file |
| C. | one byte |
| D. | one block |
| Answer» B. complete file | |
| 80. |
Network file system(NFS) is developed by? |
| A. | sun microsystem |
| B. | oracle |
| C. | apple |
| D. | honeywell |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» 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 |
| Answer» D. all of the mentioned | |
| 100. |
_______ is not possible in distributed file system. |
| A. | file replication |
| B. | migration |
| C. | client interface |
| D. | remote access |
| Answer» B. migration | |
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