Try and practice the latest Confluent : CCDAK real questions & answers
Updated: Jul 04, 2026
No. of Questions: 92 Questions & Answers with Testing Engine
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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:
1. What are two examples of performance metrics?
(Select two.)
A) Number of active user sessions
B) Time of last failed login
C) fetch-rate
D) incoming-byte-rate
E) Number of active users
F) total-login-attempts
2. You are writing to a topic with acks=all.
The producer receives acknowledgments but you notice duplicate messages.
You find that timeouts due to network delay are causing resends.
Which configuration should you use to prevent duplicates?
A) retries=0max.in.flight.requests.per.connection=5enable.idempotence=true
B) enable.auto.commit=true
C) retries=2147483647max.in.flight.requests.per.connection=5enable.idempotence=true
D) retries=2147483647max.in.flight.requests.per.connection=1enable.idempotence=false
3. Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
(Select two.)
A) The consumer chooses which partition to read without any assignment from brokers.
B) It is mandatory to subscribe to a topic before calling assign() to assign partitions.
C) The consumer group will not be rebalanced if a consumer leaves the group.
D) All topics must have the same number of partitions to use assign() API.
4. (You are experiencing low throughput from a Java producer.
Kafka producer metrics show a low I/O thread ratio and low I/O thread wait ratio.
What is the most likely cause of the slow producer performance?)
A) Compression is enabled.
B) The producer code has an expensive callback function.
C) The producer is sending large batches of messages.
D) There is a bad data link layer (Layer 2) connection from the producer to the cluster.
5. You use Kafka Connect with the JDBC source connector to extract data from a large database and push it into Kafka.
The database contains tens of tables, and the current connector is unable to process the data fast enough.
You add more Kafka Connect workers, but throughput doesn't improve.
What should you do next?
A) Increase the value of the connector's property tasks.max.
B) Modify the database schemas to enable horizontal sharding.
C) Add more Kafka brokers to the cluster.
D) Increase the number of Kafka partitions for the topics.
Solutions:
| Question # 1 Answer: C,D | Question # 2 Answer: C | Question # 3 Answer: A,C | Question # 4 Answer: B | Question # 5 Answer: A |
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