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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You are implementing a Kafka Streams application to process financial transactions.
Each transaction must be processed exactly once to ensure accuracy.
The application reads from an input topic, performs computations, and writes results to an output topic.
During testing, you notice duplicate entries in the output topic, which violates the exactly-once processing requirement.
You need to ensure exactly-once semantics (EOS) for this Kafka Streams application.
Which step should you take?)

A) Set processing.guarantee=exactly_once_v2 in the Kafka Streams configuration.
B) Enable compaction on the output topic to handle duplicates.
C) Set enable.exactly_once=true in the Kafka Streams configuration.
D) Set enable.idempotence=true in the internal producer configuration of the Kafka Streams application.

2. Where are source connector offsets stored?

A) topic.offset.config
B) offset.storage.topic
C) storage.offset.topic
D) offset, storage, partitions

3. 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) There is a storage issue on the broker.
C) There is a slow consumer processing application.
D) The number of partitions does not match the number of application instances.

4. A stream processing application is tracking user activity in online shopping carts.
You want to identify periods of user inactivity.
Which type of Kafka Streams window should you use?

A) Sliding
B) Tumbling
C) Hopping
D) Session

5. You are working on a Kafka cluster with three nodes. You create a topic named orders with:
replication.factor = 3
min.insync.replicas = 2
acks = allWhat exception will be generated if two brokers are down due to network delay?

A) NotLeaderForPartitionException
B) NotEnoughReplicasException
C) NetworkException
D) NotCoordinatorException

Solutions: