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Confluent Certified Developer for Apache Kafka Certification Examination Questions 31–35 (page: 8)

Updated On: 10-Feb-2026

To get acknowledgement of writes to only the leader partition, we need to use the config...

  1. acks=1
  2. acks=0
  3. acks=all

Answer(s): A

Explanation:

Producers can set acks=1 to get acknowledgement from partition leader only.



How will you find out all the partitions where one or more of the replicas for the partition are not in- sync with the leader?

  1. kafka-topics.sh --bootstrap-server localhost:9092 --describe --unavailable- partitions
  2. kafka-topics.sh --zookeeper localhost:2181 --describe --unavailable- partitions
  3. kafka-topics.sh --broker-list localhost:9092 --describe --under-replicated-partitions
  4. kafka-topics.sh --zookeeper localhost:2181 --describe --under-replicated-partitions

Answer(s): D



If a topic has a replication factor of 3...

  1. 3 replicas of the same data will live on 1 broker
  2. Each partition will live on 4 different brokers
  3. Each partition will live on 2 different brokers
  4. Each partition will live on 3 different brokers

Answer(s): D

Explanation:

Replicas are spread across available brokers, and each replica = one broker. RF 3 = 3 brokers



How do Kafka brokers ensure great performance between the producers and consumers? (Select two)

  1. It compresses the messages as it writes to the disk
  2. It leverages zero-copy optimisations to send data straight from the page-cache
  3. It buffers the messages on disk, and sends messages from the disk reads
  4. It transforms the messages into a binary format
  5. It does not transform the messages

Answer(s): B,E

Explanation:

Kafka transfers data with zero-copy and sends the raw bytes it receives from the producer straight to the consumer, leveraging the RAM available as page cache



What isn't an internal Kafka Connect topic?

  1. connect-status
  2. connect-offsets
  3. connect-configs
  4. connect-jars

Answer(s): D

Explanation:

connect-configs stores configurations, connect-status helps to elect leaders for connect, and connect-offsets store source offsets for source connectors



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