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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Which partition assignment minimizes partition movements between two assignments?

A) RoundRobinAssignor
B) StickyAssignor
C) RangeAssignor
D) PartitionAssignor

2. Which statement is true about how exactly-once semantics (EOS) work in Kafka Streams?

A) EOS in Kafka Streams relies on transactional producers to atomically commit state updates to changelog topics and output records to Kafka.
B) Kafka Streams provides EOS by periodically checkpointing state stores and replaying changelogs to recover only unprocessed messages during failure.
C) Kafka Streams disables log compaction on internal changelog topics to preserve all state changes for potential recovery.
D) EOS in Kafka Streams is implemented by creating a separate Kafka topic for deduplication of all messages processed by the application.

3. What is a consequence of increasing the number of partitions in an existing Kafka topic?

A) Records with the same key could be located in different partitions.
B) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.
C) Consumers will need to process data from more partitions which will significantly increase consumer lag.
D) The acknowledgment process will increase latency for producers using acks=all.

4. You are developing a Java application using a Kafka consumer.
You need to integrate Kafka's client logs with your own application's logs using log4j2.
Which Java library dependency must you include in your project?

A) SLF4J implementation for Log4j 1.2 (org.slf4j:slf4j-log4j12)
B) None, the right dependency will be added by the Kafka client dependency by transitivity.
C) SLF4J implementation for Log4j2 (org.apache.logging.log4j:log4j-slf4j-impl)
D) Just the log4j2 dependency of the application

5. You need to collect logs from a host and write them to a Kafka topic named 'logs-topic'. You decide to use Kafka Connect File Source connector for this task.
What is the preferred deployment mode for this connector?

A) Parallel mode
B) SingleCluster mode
C) Distributed mode
D) Standalone mode

Solutions: