Deck 3: Distributed Systems and File System

Question 1

In Casual consistency model all processes shared accesses in

A)random order
B)same order
C)sequential order
D)specific order

Answer 1

same order

Question 2

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

A)strict
B)weak
C)casual
D)sequential

Answer 2

strict

Question 3

--------------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 3

fifo

Question 4

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

Question 5

replicas are used only to improve access time on data

A)client initiated
B)server initiated
C)permanent
D)dynamic

Question 6

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

Question 7

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

Question 8

Optimistic logging protocols need to keep track of

A)independencies
B)checking points
C)dependencies
D)erroneous state

Question 9

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

Question 10

Staleness deviations relate to the a replica was updated.

A)first time
B)most recent time
C)last time
D)previous time

Question 11

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

Question 12

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.

Question 13

File Replication is done to

A)increase complexity
B)increase cost
C)increase reliability
D)increase data

Question 14

in NFS which funtion is used for creating new file?

A)open()
B)create()
C)develope()
D)null()

Question 15

datanodes and namenode are two elements of which file system?

A)afs
B)hdfs
C)nfs
D)none of the above

Question 16

In which file system mapreduce function is used?

A)afs
B)nfs
C)hdfs
D)none of the above

Question 17

In distributed file system, DNS stands for?

A)domain name system
B)domain name server
C)directory name service
D)disk name system

Question 18

NFS file System uses Mechanism

A)rpc
B)corba
C)rmi
D)none of the above

Question 19

map and reduce are

A)libraries
B)functions
C)file system
D)os

Question 20

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

Question 21

HDFS works in a fashion.

A)master-master
B)master-slave
C)slave-slave
D)none of the above

Question 22

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

A)rack
B)data
C)secondary
D)primary

Question 23

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

Question 24

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