Confluent CCDAK : Confluent Certified Developer for Apache Kafka Certification Examination

  • Exam Code: CCDAK
  • Exam Name: Confluent Certified Developer for Apache Kafka Certification Examination
  • Updated: Oct 07, 2026
  • Q & A: 92 Questions and Answers

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Confluent CCDAK Exam Syllabus Topics:

SectionObjectives
Topic 1: Kafka Fundamentals- Kafka architecture and core concepts
  • 1. Replication and fault tolerance
    • 2. Brokers, topics, partitions
      - Data flow in Kafka
      • 1. Offset management
        • 2. Producer and consumer model
          Topic 2: Kafka Ecosystem and Confluent Platform- Schema Registry
          • 1. Avro, Protobuf, JSON Schema usage
            - ksqlDB and connectors
            • 1. Kafka Connect basics
              • 2. Stream querying concepts
                Topic 3: Kafka Streams and Processing- Kafka Streams API
                • 1. Stream processing fundamentals
                  • 2. Stateful vs stateless processing
                    - Event processing patterns
                    • 1. Exactly-once semantics
                      • 2. Windowing and aggregation
                        Topic 4: Kafka Producers and Consumers- Producer API
                        • 1. Serialization and partitioning strategies
                          • 2. Reliability and acknowledgments
                            - Consumer API
                            • 1. Consumer groups
                              • 2. Rebalancing and offset commits

                                Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

                                Question #1

                                Your application is consuming from a topic configured with a deserializer.
                                It needs to be resilient to badly formatted records ("poison pills"). You surround the poll() call with a try/catch for RecordDeserializationException.
                                You need to log the bad record, skip it, and continue processing.
                                Which action should you take in the catch block?

                                • A. Log the bad record, no other action needed.
                                • B. Throw a runtime exception to trigger a restart of the application.
                                • C. Log the bad record and call the consumer.skip() method.
                                • D. Log the bad record and seek the consumer to the offset of the next record.
                                Reveal Solution  Discussion  0

                                Correct Answer: D  🗳️

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                                Question #2

                                (A consumer application needs to use an at-most-once delivery semantic.
                                What is the best consumer configuration and code skeleton to avoid duplicate messages being read?)

                                • A. auto.offset.reset=earliest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
                                • B. auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
                                • C. auto.offset.reset=latest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
                                • D. auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
                                Reveal Solution  Discussion  0

                                Correct Answer: D  🗳️

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                                Question #3

                                Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
                                (Select two.)

                                • A. It is mandatory to subscribe to a topic before calling assign() to assign partitions.
                                • B. The consumer chooses which partition to read without any assignment from brokers.
                                • C. All topics must have the same number of partitions to use assign() API.
                                • D. The consumer group will not be rebalanced if a consumer leaves the group.
                                Reveal Solution  Discussion  0

                                Correct Answer: B,D  🗳️

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                                Question #4

                                Clients that connect to a Kafka cluster are required to specify one or more brokers in the bootstrap.servers parameter.
                                What is the primary advantage of specifying more than one broker?

                                • A. It forces clients to enumerate every single broker in the cluster.
                                • B. It provides the ability to wake up dormant brokers.
                                • C. It is the mechanism to distribute a topic's partitions across multiple brokers.
                                • D. It provides redundancy in making the initial connection to the Kafka cluster.
                                Reveal Solution  Discussion  0

                                Correct Answer: D  🗳️

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                                Question #5

                                You have a topic with four partitions. The application reads from it using two consumers in a single consumer group.
                                Processing is CPU-bound, and lag is increasing.
                                What should you do?

                                • A. Increase the max.poll.records property of consumers.
                                • B. Add more partitions to the topic to increase the level of parallelism of the processing.
                                • C. Add more consumers to increase the level of parallelism of the processing.
                                • D. Decrease the max.poll.records property of consumers.
                                Reveal Solution  Discussion  0

                                Correct Answer: C  🗳️

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