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Confluent CCDAK Exam Syllabus Topics:

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

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                                Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q45-Q50):

                                NEW QUESTION # 45
                                What is the default maximum size of a message the Apache Kafka broker can accept?

                                Answer: B

                                Explanation:
                                The default maximum message size that a Kafka broker accepts is1MB (1,048,576 bytes), controlled by the config propertymessage.max.bytes.
                                FromKafka Broker Configuration Docs:
                                "The default maximum message size is 1MB. To accept larger messages, configure message.max.bytes and the producer's max.request.size." Producers also have a matching limit via max.request.size, and consumers via fetch.message.max.bytes.
                                Reference:Kafka Broker Configuration > message.max.bytes


                                NEW QUESTION # 46
                                In Java, Avro SpecificRecords classes are

                                Answer: B

                                Explanation:
                                SpecificRecord is created from generated record classes


                                NEW QUESTION # 47
                                (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?)

                                Answer: B

                                Explanation:
                                According to the official Apache Kafka consumer semantics documentation, at-most-once delivery means that records may be lost but must never be processed more than once. To achieve this guarantee, a consumer must commit offsets before processing records. If the application crashes after committing but before processing, messages are skipped rather than reprocessed, which satisfies at-most-once semantics.
                                Option B correctly implements this pattern. It disables automatic offset commits (enable.auto.commit=false) and explicitly calls commitAsync() immediately after polling and before processing records. This ensures that offsets are advanced regardless of whether processing succeeds, eliminating the possibility of duplicate processing.
                                Option C represents at-least-once semantics, because offsets are committed after processing, which can lead to duplicates on failure. Options A and D rely on automatic commits or incorrect ordering and do not provide strict at-most-once guarantees.
                                The Kafka documentation explicitly states that manual offset management with commits before processing is required for at-most-once delivery.
                                Therefore, Option B is the best and officially documented configuration and code skeleton to avoid duplicate message processing.


                                NEW QUESTION # 48
                                When running a ksqlDB for connectors, what does the IF NOT EXISTS clause do?

                                Answer: B


                                NEW QUESTION # 49
                                Two consumers share the same group.id (consumer group id). Each consumer will

                                Answer: A

                                Explanation:
                                Each consumer is assigned a different partition of the topic to consume.


                                NEW QUESTION # 50
                                ......

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