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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You create a topic named stream-logs with:
A replication factor of 3
Four partitions
Messages that are plain logs without a keyHow will messages be distributed across partitions?

A) Messages will be distributed among all the topic partitions with strict ordering.
B) The first message will always be written to partition 0.
C) All messages will be written to the same log segment.
D) Messages will be distributed round-robin among all the topic partitions.

2. (You started a new Kafka Connect worker.
Which configuration identifies the Kafka Connect cluster that your worker will join?)

A) cluster.id
B) worker.id
C) connector.id
D) group.id

3. (You are writing to a Kafka topic with producer configuration acks=all.
The producer receives acknowledgements from the broker but still creates duplicate messages due to network timeouts and retries.
You need to ensure that duplicate messages are not created.
Which producer configuration should you set?)

A) retries=2147483647max.in.flight.requests.per.connection=5enable.idempotence=false
B) retries=0max.in.flight.requests.per.connection=5enable.idempotence=true
C) retries=2147483647max.in.flight.requests.per.connection=1enable.idempotence=true
D) enable.auto.commit=true

4. (You are developing a Java application that includes a Kafka consumer.
You need to integrate Kafka client logs with your own application logs.
Your application is using the Log4j2 logging framework.
Which Java library dependency must you include in your project?)

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

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

A) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.
B) Records with the same key could be located in different partitions.
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.

Solutions: