DAC Big Data & Cloud Analytics 3

Question 1

In HDFS, what is the default behavior for ensuring data durability across the cluster?

Accepted Answer

Replicating each block across multiple nodes

Answer

Storing a single copy on the master node

Answer

Compressing data into one file

Answer

Encrypting blocks with unique keys

Question 2

Which type of database is best suited for storing and querying highly connected data such as social networks?

Accepted Answer

Graph database

Answer

Columnar warehouse

Answer

Key-value cache

Answer

Flat file store

Question 3

In stream processing, what does 'windowing' primarily allow you to do?

Accepted Answer

Group events into finite time-based buckets for aggregation

Answer

Permanently store all events on disk

Answer

Encrypt the data stream

Answer

Convert streams into images

Question 4

Which Apache project is a distributed publish-subscribe messaging system commonly used for real-time data pipelines?

Accepted Answer

Apache Kafka

Answer

Apache Ant

Answer

Apache Maven

Answer

Apache Tomcat

Question 5

In Azure, which service provides a managed Apache Spark and Delta Lake analytics platform?

Accepted Answer

Azure Databricks

Answer

Azure DNS

Answer

Azure Blob Static Website

Answer

Azure Bastion

Question 6

What does the CAP theorem state a distributed data store can guarantee at most two of?

Accepted Answer

Consistency, Availability, Partition tolerance

Answer

Cost, Accuracy, Performance

Answer

Concurrency, Atomicity, Persistence

Answer

Caching, Auditing, Provisioning

Question 7

Which storage format is column-oriented and optimized for analytical queries in big data systems?

Accepted Answer

Apache Parquet

Answer

CSV

Answer

Plain text log

Answer

XML