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

HDFS replicates each data block (default 3 copies) across DataNodes for fault tolerance.

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

Graph databases model entities as nodes and relationships as edges, ideal for connected data.

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

Windowing groups continuous stream events into bounded intervals so aggregations can be computed.

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 Kafka is a distributed publish-subscribe streaming platform for real-time pipelines.

Question 5

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

Accepted Answer

Azure Databricks

Answer

Azure Databricks is a managed analytics platform built around Apache Spark and Delta Lake.

Data Analytics Certifications (DAC) Practice Test