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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. A stream processing application is consuming from a topic with five partitions. You run three instances of the application. Each instance has num.stream.threads=5.
You need to identify the number of stream tasks that will be created and how many will actively consume messages from the input topic.

A) 5 created, 1 actively consuming
B) 15 created, 5 actively consuming
C) 5 created, 5 actively consuming
D) 15 created, 15 actively consuming

2. Your company has three Kafka clusters: Development, Testing, and Production.
The Production cluster is running out of storage, so you add a new node.
Which two statements about the new node are true?
(Select two.)

A) A newly added node will have KRaft controller role by default.
B) A new node can be added without stopping existing cluster nodes.
C) A node ID will be assigned to the new node automatically.
D) A new node will not have any partitions assigned to it unless a new topic is created or reassignment occurs.

3. (You want to read messages from all partitions of a topic in every consumer instance of your application.
How do you do this?)

A) Use the subscribe() method with an empty consumer group name configuration.
B) Use the assign() method using all topic-partitions of the topic as argument.
C) Use the subscribe() method with a regular expression argument.
D) Use the assign() method with the topic name as argument.

4. Which tool can you use to modify the replication factor of an existing topic?

A) kafka-recreate-topic.sh
B) kafka-topics.sh
C) kafka-reassign-partitions.sh
D) kafka-reassign-topics.sh

5. (You are developing a Kafka Streams application with a complex topology that has multiple sources, processors, sinks, and sub-topologies.
You are working in a development environment and do not have access to a real Kafka cluster or topics.
You need to perform unit testing on your Kafka Streams application.
Which should you use?)

A) TestProducer, TestConsumer
B) KafkaUnitTestDriver
C) MockProducer, MockConsumer
D) TopologyTestDriver

Solutions: