Deck 18: HDFS, Amazon EC2, Cloud Storage, and Cloud Computing

Question 1

What is HDFS?

A)storage layer
B)batch processing engine
C)resource management layer
D)all of the above

Answer 1

storage layer

Question 2

Which among the following command is used to copy a directory from one node to another in HDFS?

A)rcp
B)distcp
C)dcp
D)drcp

Answer 2

distcp

Question 3

Which among the following is the correct statement

A)datanode manage file system namespace
B)namenode stores metadata
C)namenode stores actual data
D)all of the above

Answer 3

namenode stores metadata

Question 4

The namenode knows that the data node is active using a mechanism known as

A)active pulse
B)data pulse
C)heartbeats
D)h-signal

Question 5

What is HDFS Block in Hadoop?

A)it is the logical representation of data
B)it is the physical representation of data
C)both the above
D)none of the above

Question 6

Which of the following is the correct statement?

A)datanode is the slave/worker node and holds the user data in the form of data blocks
B)each incoming file is broken into 32 mb by defaul
C)namenode stores user data in the form of data blocks
D)none of the above

Question 7

The need for data replication can arise in various scenarios like

A)replication factor is changed
B)datanode goes down
C)data blocks get corrupted
D)all of the above

Question 8

A file in HDFS that is smaller than a single block size

A)cannot be stored in hdfs
B)occupies the full block\s size.
C)can span over multiple blocks
D)occupies only the size it needs and not the full block

Question 9

Which among the following are the duties of the NameNodes

A)manage file system namespace
B)it is responsible for storing actual data
C)perform read-write operation as per request for the clients
D)none of the above

Question 10

For the frequently accessed HDFS files the blocks are cached in

A)the memory of the data node
B)in the memory of the namenode
C)both the above
D)none of the above

Question 11

Which scenario demands highest bandwidth for data transfer between nodes

A)different nodes on the same rack
B)nodes on different racks in the same data center.
C)nodes in different data centers
D)data on the same node

Question 12

Which among the following is the duties of the Data Nodes

A)manage file system namespace
B)stores meta-data
C)regulates client's access to files
D)perform read-write operation as per request for the clients

Question 13

Amazon EC2 provides virtual computing environments, known as :

A)chunks
B)instances
C)messages
D)none of the mentioned

Question 14

Data stored in domains doesn't require maintenance of a schema.

A)simpledb
B)sql server
C)oracle
D)rds

Question 15

Which of the following is a system for creating block level storage devices that can be used for Amazon Machine Instances in EC2 ?

A)cloudwatch
B)amazon elastic block store
C)aws import/export
D)all of the mentioned

Question 16

Which of the following type of virtualization is also characteristic of cloud computing

A)storage
B)application
C)cpu
D)all of the mentioned

Question 17

Which of the following is most important feature of cloud storage listed below ?

A)logon authentication
B)bare file
C)multiplatform support
D)adequate bandwidth

Question 18

Which of the following backup create a cloned copy of your current data or drive ?

A)continuous data protection
B)open file backup
C)reverse delta backup
D)none of the mentioned

Question 19

Which of the following storage devices exposes its storage to clients as Raw storage that can be partitioned to create volumes ?

A)block
B)file
C)disk
D)all of the mentioned

Question 20

. Which of the following allows you to create instances of the MySQL database to support your Web sites?

A)amazon elastic compute cloud
B)amazon simple queue service
C)amazon relational database service
D)amazon simple storage system

Question 21

Which of the following is not the feature of Network management systems?

A)accounting
B)security
C)performance
D)none of the mentioned

Question 22

The following flowchart is intended to evaluate in any cloud.

A)risk
B)errors
C)inconsistencies
D)none of the mentioned

Question 23

Point out the wrong statement.

A)you can use proxy and brokerage services to separate clients from direct access to shared cloud storage
B)any distributed application has a much greater attack surface than an application that is closely held on a local area network
C)cloud computing doesn't have vulnerabilities associated with internet applications
D)all of the mentioned

Question 24

Which of the following is the operational domain of CSA(Cloud Security Alliance)?

A)scalability
B)portability and interoperability
C)flexibility
D)none of the mentioned

Question 25

Which of the following functional cloud computing hardware/software stack is the Cloud Reference Model?

A)cas
B)csa
C)sac
D)all of the mentioned

Question 26

Amazon Relational Database Service is a variant of the 5.1 database system.

A)oracle
B)mysql
C)sql server
D)all of the mentioned