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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You are building a consumer application that processes events from a Kafka topic. What is the most important metric to monitor to ensure real-time processing?

A) records-lag-max
B) UnderReplicatedPartitions
C) BytesInPerSec
D) MessagesInPerSec

2. What's is true about Kafka brokers and clients from version 0.10.2 onwards?

A) A newer client can talk to a newer broker, but an older client cannot talk to a newer broker
B) A newer client can talk to a newer broker, and an older client can talk to a newer broker
C) Clients and brokers must have the exact same version to be able to communicate
D) A newer client can't talk to a newer broker, but an older client can talk to a newer broker

3. What is the disadvantage of request/response communication?

A) Reliability
B) Scalability
C) Cost
D) Coupling

4. A producer is sending messages with null key to a topic with 6 partitions using the DefaultPartitioner. Where will the messages be stored?

A) Partition 5
B) Partition 0
C) Any of the topic partitions
D) The partition for the null key

5. The producer code below features a Callback class with a method called onCompletion().
In the onCompletion() method, when the request is completed successfully, what does the value metadata.offset() represent?

A) The ID of the partition to which the message was committed
B) The sequential ID of the message committed into a partition
C) The number of bytes that overflowed beyond a producer batch of messages
D) Its position in the producer's batch of messages

Solutions: