Question 1

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  IoT devices (and many other types of devices and applications) commonly communicate with one another and with applications via pub/sub (publisher/subscriber) systems. 
B)  A publisher is any device or application that sends a message to a cloud-based service, which in turn sends that message to all subscribers. Typically each publisher specifies a topic or channel, and each subscriber specifies one or more topics or channels for which they'd like to receive messages. 
C)  Apache Kafka is a Hadoop ecosystem component that provides a high-performance publish/subscribe service, real-time stream processing and storage of streamed data. 
D)  All of the above statements are true. 
A)  IoT devices (and many other types of devices and applications) commonly communicate with one another and with applications via pub/sub (publisher/subscriber) systems. 
B)  A publisher is any device or application that sends a message to a cloud-based service, which in turn sends that message to all subscribers. Typically each publisher specifies a topic or channel, and each subscriber specifies one or more topics or channels for which they'd like to receive messages. 
C)  Apache Kafka is a Hadoop ecosystem component that provides a high-performance publish/subscribe service, real-time stream processing and storage of streamed data. 
D)  All of the above statements are true.

Question 2

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  A graph database stores nodes, edges and their attributes. If you use social networks, like Instagram, Snapchat, Twitter and Facebook, consider your xe "social graph"social graph, which consists of the people you know (nodes) and the relationships between them (edges). Every person has their own social graph, and these are interconnected. 
B)  The famous "six degrees of separation" problem says that any two people in the world are connected to one another by following a maximum of six edges in the worldwide social graph. 
C)  Facebook's algorithms use the social graphs of their billions of users to determine which stories should appear in each user's news feed. 
D)  All of the above statements are true. 
A)  A graph database stores nodes, edges and their attributes. If you use social networks, like Instagram, Snapchat, Twitter and Facebook, consider your xe "social graph"social graph, which consists of the people you know (nodes) and the relationships between them (edges). Every person has their own social graph, and these are interconnected. 
B)  The famous "six degrees of separation" problem says that any two people in the world are connected to one another by following a maximum of six edges in the worldwide social graph. 
C)  Facebook's algorithms use the social graphs of their billions of users to determine which stories should appear in each user's news feed. 
D)  All of the above statements are true.

Question 3

Which of the following statements is false?

Accepted Answer

A)  By default, Spark streaming maintains state information as you process the stream of RDDs. 
B)  You can use Spark checkpointing to keep track of the streaming state. Checkpointing enables xe "Spark (Apache):fault-tolerance in streaming"xe "fault tolerance:Spark streaming"fault-tolerance for restarting a stream in cases of cluster node or Spark application failures, and xe "Spark (Apache):stateful transformations in streaming"xe "stateful transformations (Spark streaming)"stateful transformations, such as summarizing the data received so far-as we're doing in this example. 
C)  StreamingContext method checkpoint sets up a checkpointing folder where state information is stored, as in: ssc.checkpoint('hashtagsummarizer_checkpoint') 
D)  For a Spark streaming application in a cloud-based cluster, you'd specify a location within xe "HDFS (Hadoop Distributed File System)"HDFS to store the checkpoint folder. 
A)  By default, Spark streaming maintains state information as you process the stream of RDDs. 
B)  You can use Spark checkpointing to keep track of the streaming state. Checkpointing enables xe "Spark (Apache):fault-tolerance in streaming"xe "fault tolerance:Spark streaming"fault-tolerance for restarting a stream in cases of cluster node or Spark application failures, and xe "Spark (Apache):stateful transformations in streaming"xe "stateful transformations (Spark streaming)"stateful transformations, such as summarizing the data received so far-as we're doing in this example. 
C)  StreamingContext method checkpoint sets up a checkpointing folder where state information is stored, as in: ssc.checkpoint('hashtagsummarizer_checkpoint') 
D)  For a Spark streaming application in a cloud-based cluster, you'd specify a location within xe "HDFS (Hadoop Distributed File System)"HDFS to store the checkpoint folder.

Question 4

Relational databases typically use ACID (Atomicity, xe "consistency"Consistency, Isolation, Durability) transactions. Which of the following ACID attributes is described by: "ensures that concurrent transactions occur as if they were performed sequentially?"

Accepted Answer

A)  Atomicity 
B)  Consistency 
C)  Isolation 
D)  Durability 
A)  Atomicity 
B)  Consistency 
C)  Isolation 
D)  Durability

Question 5

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  You work with a SparkContext using functional-style programming techniques (like filtering, mapping and reduction) applied to a resilient distributed dataset (RD
D) . 
B)  An RDD takes data stored throughout a cluster in the Hadoop file system and enables you to specify a series of processing steps to transform the data in the RDD. 
C)  The processing steps mentioned in Part (b) are greedy-the steps are performed immediately in response to the method call. 
D)  All of the above statements are true. 
A)  You work with a SparkContext using functional-style programming techniques (like filtering, mapping and reduction) applied to a resilient distributed dataset (RD
D) . 
B)  An RDD takes data stored throughout a cluster in the Hadoop file system and enables you to specify a series of processing steps to transform the data in the RDD. 
C)  The processing steps mentioned in Part (b) are greedy-the steps are performed immediately in response to the method call. 
D)  All of the above statements are true.

Question 6

Which Hadoop ecosystem technology is described by "SQL querying of non-relational data in Hadoop and NoSQL databases."

Accepted Answer

A)  Ambari 
B)  Drill 
C)  Flume 
D)  HBase 
A)  Ambari 
B)  Drill 
C)  Flume 
D)  HBase

Question 7

Which of the following statements is false?

Accepted Answer

A)  A database is an integrated collection of data. 
B)  Database management systems allow for convenient access and storage of data without concern for the internal representation of databases. 
C)  Rxe "relational database:relational database management system (RDBMS)"elational database management systems (RDBMSs) store data in xe ""tables and define relationships among the tables. xe "Structured Query Language (SQL)" 
D)  Table Query Language is used almost universally with relational database systems to manipulate data and perform queries, which request information that satisfies given criteria. 
A)  A database is an integrated collection of data. 
B)  Database management systems allow for convenient access and storage of data without concern for the internal representation of databases. 
C)  Rxe "relational database:relational database management system (RDBMS)"elational database management systems (RDBMSs) store data in xe ""tables and define relationships among the tables. xe "Structured Query Language (SQL)" 
D)  Table Query Language is used almost universally with relational database systems to manipulate data and perform queries, which request information that satisfies given criteria.

Question 8

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  Most major cloud vendors have support for Hadoop and Spark computing clusters that you can configure to meet your application's requirements. 
B)  Multi-node cloud-based clusters typically are free services. 
C)  Microsoft Azure's HDInsight service provides Hadoop capabilities. 
D)  All of the above statements are true. 
A)  Most major cloud vendors have support for Hadoop and Spark computing clusters that you can configure to meet your application's requirements. 
B)  Multi-node cloud-based clusters typically are free services. 
C)  Microsoft Azure's HDInsight service provides Hadoop capabilities. 
D)  All of the above statements are true.

Question 9

Consider the following mapper code: 1 #!/usr/bin/env python3
2 # length_mapper.py
3 """Maps lines of text to key-value pairs of word lengths and 1."""
4 import sys
5
6 def tokenize_input():
7 """Split each line of standard input into a list of strings."""
8 for line in sys.stdin:
9 yield line.split()
10
11 # read each line in the the standard input and for every word
12 # produce a key-value pair containing the word, a tab and 1
13 for line in tokenize_input():
14 for word in line:
15 print(str(len(word)) + '	1')
Which of the following statements a), b) or c) is false.

Accepted Answer

A)  Generator function tokenize_input reads lines of text from the standard input stream and for each returns a list of strings. 
B)  When Hadoop executes the script, lines 13-15 iterate through the lists of strings from tokenize_input. For each list (line) and for every string (word) in that list, the script outputs a key-value pair with the word's length as the key, a tab (	) and the value 1, indicating that there is one word (so far) of that length. Of course, there probably are many words of that length. 
C)  The MapReduce algorithm's reduction step will summarize these key-value pairs. 
D)  All of the above statements are true. 
A)  Generator function tokenize_input reads lines of text from the standard input stream and for each returns a list of strings. 
B)  When Hadoop executes the script, lines 13-15 iterate through the lists of strings from tokenize_input. For each list (line) and for every string (word) in that list, the script outputs a key-value pair with the word's length as the key, a tab (	) and the value 1, indicating that there is one word (so far) of that length. Of course, there probably are many words of that length. 
C)  The MapReduce algorithm's reduction step will summarize these key-value pairs. 
D)  All of the above statements are true.

Question 10

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  MongoDB is a document database capable of storing and retrieving JSON documents. 
B)  Twitter's APIs return tweets to you as xe "JSON (JavaScript Object Notation):object"JSON objects, which you can write directly into a MongoDB database. 
C)  MongoDB provides the free cloud-based MongoDB Atlas cluster for installation on your local computer. 
D)  All of the above statements are true. 
A)  MongoDB is a document database capable of storing and retrieving JSON documents. 
B)  Twitter's APIs return tweets to you as xe "JSON (JavaScript Object Notation):object"JSON objects, which you can write directly into a MongoDB database. 
C)  MongoDB provides the free cloud-based MongoDB Atlas cluster for installation on your local computer. 
D)  All of the above statements are true.

Question 11

Which of the following statements a), b) or c) about graph databases is false?

Accepted Answer

A)  A graph database models relationships between objects. 
B)  The objects are called nodes (or vertices) and the relationships are called edges. 
C)  Edges are bidirectional. 
D)  All of the above statements are true. 
A)  A graph database models relationships between objects. 
B)  The objects are called nodes (or vertices) and the relationships are called edges. 
C)  Edges are bidirectional. 
D)  All of the above statements are true.

Question 12

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  For languages like Python that are not natively supported in Hadoop, you must use Hadoop streaming to implement your tasks. 
B)  In Hadoop streaming, the Python scripts that implement the mapping and reduction steps use network sockets to communicate with Hadoop. 
C)  Usually, the standard input stream reads from the keyboard and the standard output stream writes to the command line. However, these can be redirected (as Hadoop does) to read from other sources and write to other destinations. 
D)  All of the above statements are true. 
A)  For languages like Python that are not natively supported in Hadoop, you must use Hadoop streaming to implement your tasks. 
B)  In Hadoop streaming, the Python scripts that implement the mapping and reduction steps use network sockets to communicate with Hadoop. 
C)  Usually, the standard input stream reads from the keyboard and the standard output stream writes to the command line. However, these can be redirected (as Hadoop does) to read from other sources and write to other destinations. 
D)  All of the above statements are true.

Question 13

Which of the following statements is false?

Accepted Answer

A)  Pandas DataFrame method groupby groups data by a specified column's values, as in:
Tweets_counts_by_state = tweet_counts_df.groupby(
'State', as_index=False).sum() 
B)  The as_index=False keyword argument in Part (a) indicates that the values on which grouping was performed ('State' in this case) should be values in a row of the resulting GroupBy object, rather than the indices for the columns. 
C)  The GroupBy object's sum method, which is called at the end of the snippet in Part (a), totals the GroupBy object's numeric data by 'State'. 
D)  All of the above statements are true. 
A)  Pandas DataFrame method groupby groups data by a specified column's values, as in:
Tweets_counts_by_state = tweet_counts_df.groupby(
'State', as_index=False).sum() 
B)  The as_index=False keyword argument in Part (a) indicates that the values on which grouping was performed ('State' in this case) should be values in a row of the resulting GroupBy object, rather than the indices for the columns. 
C)  The GroupBy object's sum method, which is called at the end of the snippet in Part (a), totals the GroupBy object's numeric data by 'State'. 
D)  All of the above statements are true.

Question 14

Which of the following statements a), b) or c) is false.

Accepted Answer

A)  The types of applications that use NoSQL databases typically do not require the guarantees that ACID-compliant databases provide. 
B)  Many NoSQL databases typically adhere to the BASE (Basic Availability, Soft-state, Eventual consistency) model, which focuses more on the database's availability. 
C)  Whereas BASE databases guarantee consistency when you write to the database, ACID databases provide consistency at some later point in time. 
D)  All of the above statements are true. 
A)  The types of applications that use NoSQL databases typically do not require the guarantees that ACID-compliant databases provide. 
B)  Many NoSQL databases typically adhere to the BASE (Basic Availability, Soft-state, Eventual consistency) model, which focuses more on the database's availability. 
C)  Whereas BASE databases guarantee consistency when you write to the database, ACID databases provide consistency at some later point in time. 
D)  All of the above statements are true.

Question 15

Xe "author_ISBN table of books database"A goal when designing a relational database is to minimize data ________ among the tables.

Accepted Answer

A)  dependency 
B)  binding 
C)  duplication 
D)  None of the above 
A)  dependency 
B)  binding 
C)  duplication 
D)  None of the above

Question 16

Which of the following statements is false?

Accepted Answer

A)  A SparkContext (from module pyspark) object gives you access to Spark's capabilities in Python. 
B)  Many Spark environments create the SparkContext for you, but in the Jupyter pyspark-notebook Docker stack, you must create this object. 
C)  Threads enable a single node cluster to execute portions of the Spark tasks xe "concurrent execution"concurrently to simulate the parallelism that Spark clusters provide. 
D)  When we say that two tasks are operating in parallel, we mean that they're both making progress at once-typically by executing a task for a short burst of time, then allowing another task to execute. When we say that two tasks are operating concurrently, we mean that they're executing simultaneously, which is one of the key benefits of Hadoop and Spark executing on cloud-based clusters of computers. 
A)  A SparkContext (from module pyspark) object gives you access to Spark's capabilities in Python. 
B)  Many Spark environments create the SparkContext for you, but in the Jupyter pyspark-notebook Docker stack, you must create this object. 
C)  Threads enable a single node cluster to execute portions of the Spark tasks xe "concurrent execution"concurrently to simulate the parallelism that Spark clusters provide. 
D)  When we say that two tasks are operating in parallel, we mean that they're both making progress at once-typically by executing a task for a short burst of time, then allowing another task to execute. When we say that two tasks are operating concurrently, we mean that they're executing simultaneously, which is one of the key benefits of Hadoop and Spark executing on cloud-based clusters of computers.

Question 17

A ________ shades areas in a Folium map using the values you specify to determine color.

Accepted Answer

A)  chromatic 
B)  choropleth 
C)  variagator 
D)  None of the above 
A)  chromatic 
B)  choropleth 
C)  variagator 
D)  None of the above

Question 18

Which Hadoop ecosystem technology is described by "A service for managing cluster configurations and coordination between clusters?"

Accepted Answer

A)  Sqoop 
B)  Storm 
C)  ZooKeeper 
D)  None of the above 
A)  Sqoop 
B)  Storm 
C)  ZooKeeper 
D)  None of the above

Question 19

________ your IP address is a MongoDB security measure which ensures that only IP addresses you verify are allowed to interact with your MongoDB Atlas cluster.

Accepted Answer

A)  Blocking 
B)  Blacklisting 
C)  Whitelisting 
D)  None of the above. 
A)  Blocking 
B)  Blacklisting 
C)  Whitelisting 
D)  None of the above.

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Relational databases typically use ACID (Atomicity, xe "consistency"Consistency, Isolation, Durability) transactions. Which of the following ACID attributes is described by: "ensures that concurrent transactions occur as if they were performed sequentially?"

Which of the following statements a), b) or c) is false?

Which Hadoop ecosystem technology is described by "SQL querying of non-relational data in Hadoop and NoSQL databases."

Which of the following statements is false?

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) about graph databases is false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Which of the following statements a), b) or c) is false.

Xe "author_ISBN table of books database"A goal when designing a relational database is to minimize data ________ among the tables.

Which of the following statements is false?

A ________ shades areas in a Folium map using the values you specify to determine color.

Which Hadoop ecosystem technology is described by "A service for managing cluster configurations and coordination between clusters?"

________ your IP address is a MongoDB security measure which ensures that only IP addresses you verify are allowed to interact with your MongoDB Atlas cluster.

Introduction to Computers and Python

Introduction to Python Programming

Control Statements and Program Development

Functions

Sequences: Lists and Tuples

Dictionaries and Sets

Array-Oriented Programming With Num

Strings: a Deeper Look

Files and Exceptions

Object-Oriented Programming

Computer Science Thinking: Recursion, Searching, Sorting and Big O

Natural Language Processing

Data Mining Twitter

Ibm Watson and Cognitive Computing

Machine Learning: Classification, Regression and Clustering

Deep Learning

Filters

Exam 17: Big Data: Hadoop, Spark, Nosql and Iot

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Relational databases typically use ACID (Atomicity, xe "consistency"Consistency, Isolation, Durability) transactions. Which of the following ACID attributes is described by: "ensures that concurrent transactions occur as if they were performed sequentially?"

Which of the following statements a), b) or c) is false?

Which Hadoop ecosystem technology is described by "SQL querying of non-relational data in Hadoop and NoSQL databases."

Which of the following statements is false?

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) about graph databases is false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Which of the following statements a), b) or c) is false.

Xe "author_ISBN table of books database"A goal when designing a relational database is to minimize data ________ among the tables.

Which of the following statements is false?

A ________ shades areas in a Folium map using the values you specify to determine color.

Which Hadoop ecosystem technology is described by "A service for managing cluster configurations and coordination between clusters?"

________ your IP address is a MongoDB security measure which ensures that only IP addresses you verify are allowed to interact with your MongoDB Atlas cluster.

Introduction to Computers and Python

Introduction to Python Programming

Control Statements and Program Development

Functions

Sequences: Lists and Tuples

Dictionaries and Sets

Array-Oriented Programming With Num

Strings: a Deeper Look

Files and Exceptions

Object-Oriented Programming

Computer Science Thinking: Recursion, Searching, Sorting and Big O

Natural Language Processing

Data Mining Twitter

Ibm Watson and Cognitive Computing

Machine Learning: Classification, Regression and Clustering

Deep Learning

Filters