Confluent Confluent Certified Developer CCDAK Questions & Answers

• Question 1:

  If you enable an SSL endpoint in Kafka, what feature of Kafka will be lost?

  A. Cross-cluster mirroring

  B. Support for Avro format

  C. Zero copy

  D. Exactly-once delivery

  Correct Answer: C

  With SSL, messages will need to be encrypted and decrypted, by being first loaded into the JVM, so you lose the zero copy optimization. See more information herehttps://twitter.com/ijuma/ status/1161303431501324293?s=09

• Question 2:

  What are the requirements for a Kafka broker to connect to a Zookeeper ensemble? (select two)

  A. Unique value for each broker's zookeeper.connect parameter

  B. Unique values for each broker's broker.id parameter

  C. All the brokers must share the same broker.id

  D. All the brokers must share the same zookeeper.connect parameter

  Correct Answer: BD

  Each broker must have a unique broker id and connect to the same zk ensemble and root zNode

• Question 3:

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

  A. 3 replicas of the same data will live on 1 broker

  B. Each partition will live on 4 different brokers

  C. Each partition will live on 2 different brokers

  D. Each partition will live on 3 different brokers

  Correct Answer: D

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

• Question 4:

  To allow consumers in a group to resume at the previously committed offset, I need to set the proper value for...

  A. value.deserializer

  B. auto.offset.resets

  C. group.id

  D. enable.auto.commit

  Correct Answer: C

  Setting a group.id that's consistent across restarts will allow your consumers part of the same group to resume reading from where offsets were last committed for that group

• Question 5:

  There are 3 producers writing to a topic with 5 partitions. There are 10 consumers consuming from the topic as part of the same group. How many consumers will remain idle?

  A. 10

  B. 3

  C. None

  D. 5

  Correct Answer: D

  One consumer per partition assignment will keep 5 consumers idle.

• Question 6:

  A topic has three replicas and you set min.insync.replicas to 2. If two out of three replicas are not available, what happens when a consume request is sent to broker?

  A. Data will be returned from the remaining in-sync replica

  B. An empty message will be returned

  C. NotEnoughReplicasException will be returned

  D. A new leader for the partition will be elected

  Correct Answer: A

  With this configuration, a single in-sync replica is still readable, but not writeable if the producer using acks=all

• Question 7:

  What is returned by a producer.send() call in the Java API?

  A. Future object

  B. A Boolean indicating if the call succeeded

  C. Future object

  D. Unit

  Correct Answer: C

  Seehttps://kafka.apache.org/21/javadoc/org/apache/kafka/clients/producer/KafkaProducer. html

• Question 8:

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

  A. acks=1

  B. acks=0

  C. acks=all

  Correct Answer: A

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

• Question 9:

  What isn't an internal Kafka Connect topic?

  A. connect-status

  B. connect-offsets

  C. connect-configs

  D. connect-jars

  Correct Answer: D

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

• Question 10:

  To produce data to a topic, a producer must provide the Kafka client with...

  A. the list of brokers that have the data, the topic name and the partitions list

  B. any broker from the cluster and the topic name and the partitions list

  C. all the brokers from the cluster and the topic name

  D. any broker from the cluster and the topic name

  Correct Answer: D

  All brokers can respond to a Metadata request, so a client can connect to any broker in the cluster and then figure out on its own which brokers to send data to.