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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Clients that connect to a Kafka cluster are required to specify one or more brokers in the bootstrap.servers parameter.
What is the primary advantage of specifying more than one broker?

A) It provides redundancy in making the initial connection to the Kafka cluster.
B) It forces clients to enumerate every single broker in the cluster.
C) It provides the ability to wake up dormant brokers.
D) It is the mechanism to distribute a topic's partitions across multiple brokers.

2. (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) There is a bad data link layer (Layer 2) connection from the producer to the cluster.
B) Compression is enabled.
C) The producer code has an expensive callback function.
D) The producer is sending large batches of messages.

3. (You are developing a Kafka Streams application with a complex topology that has multiple sources, processors, sinks, and sub-topologies.
You are working in a development environment and do not have access to a real Kafka cluster or topics.
You need to perform unit testing on your Kafka Streams application.
Which should you use?)

A) TopologyTestDriver
B) MockProducer, MockConsumer
C) TestProducer, TestConsumer
D) KafkaUnitTestDriver

4. An application is consuming messages from Kafka.
The application logs show that partitions are frequently being reassigned within the consumer group.
Which two factors may be contributing to this?
(Select two.)

A) An instance of the application is crashing and being restarted.
B) The number of partitions does not match the number of application instances.
C) There is a storage issue on the broker.
D) There is a slow consumer processing application.

5. Match the topic configuration setting with the reason the setting affects topic durability.
(You are given settings like unclean.leader.election.enable=false, replication.factor, min.insync.replicas=2)

Solutions: