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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You want to enrich the content of a topic by joining it with key records from a second topic.
The two topics have a different number of partitions.
Which two solutions can you use?
Select two.)

A) Repartition one topic to a new topic with the same number of partitions as the other topic (co- partitioning constraint) and use a KStream-KTable join.
B) Create as many Kafka Streams application instances as the maximum number of partitions of the two topics and use a KStream-KTable join.
C) Use a GlobalKTable for one of the topics where data does not change frequently and use a KStream- GlobalKTable join.
D) Use a KStream-KTable join; Kafka Streams will automatically repartition the topics to satisfy the co- partitioning constraint.

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

A) All topics must have the same number of partitions to use assign() API.
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) The consumer chooses which partition to read without any assignment from brokers.

3. 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 consumers to increase the level of parallelism of the processing.
C) Add more partitions to the topic to increase the level of parallelism of the processing.
D) Decrease the max.poll.records property of consumers.

4. You want to connect with username and password to a secured Kafka cluster that has SSL encryption.
Which properties must your client include?

A) security.protocol=SASL_SSLsasl.jaas.config=org.apache.kafka.common.security.plain.
PlainLoginModule required username='myUser' password='myPassword';
B) security.protocol=SSLsasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';
C) security.protocol=SASL_PLAINTEXTsasl.jaas.config=org.apache.kafka.common.security.plain.
PlainLoginModule required username='myUser' password='myPassword';
D) security.protocol=PLAINTEXTsasl.jaas.config=org.apache.kafka.common.security.ssl.
TlsLoginModule required username='myUser' password='myPassword';

5. Match the testing tool with the type of test it is typically used to perform.

Solutions: