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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You deploy a Kafka Streams application with five application instances.
Kafka Streams stores application metadata using internal topics.
Auto-topic creation is disabled in the Kafka cluster.
Which statement about this scenario is true?)

A) The application will terminate with a non-retriable exception.
B) The application will work, but application metadata will not be stored.
C) The application will continue to work and internal topics will be created, even if auto-topic creation is disabled.
D) The application will be on hold until internal topics are created manually.

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 new node can be added without stopping existing cluster nodes.
B) A newly added node will have KRaft controller role by default.
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 are writing a producer application and need to ensure proper delivery. You configure the producer with acks=all.
Which two actions should you take to ensure proper error handling?
(Select two.)

A) Use a callback argument in producer.send() where you check delivery status.
B) Check that producer.send() returned a RecordMetadata object and is not null.
C) Check the value of ProducerRecord.status().
D) Surround the call of producer.send() with a try/catch block to catch KafkaException.

4. (You create a topic with five partitions.
What can you assume about messages read from that topic by a single consumer group?)

A) Messages from one partition can be consumed by any of the consumers in a group for faster processing.
B) Messages can be consumed by a maximum of five consumers in the same consumer group.
C) The consumer group can only read the same number of messages from all the partitions.
D) All messages will be read from exactly one broker by the consumer group.

5. (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.

Solutions: