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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. What is a consequence of increasing the number of partitions in an existing Kafka topic?

A) Records with the same key could be located in different partitions.
B) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.
C) Consumers will need to process data from more partitions which will significantly increase consumer lag.
D) The acknowledgment process will increase latency for producers using acks=all.

2. What is the difference between exactly once semantics (EOS) and idempotence?

A) Idempotence sends an update multiple times and only keeps the latest update EOS requests get sent multiple times, but only the first request is accepted.
B) Idempotence sends updates multiple times and stores the first value. EOS sends updates multiple times and stores the latest value.
C) Idempotence Is any function that can be executed several times without changing the final result beyond its first iteration. EOS sends an update once and only one time.
D) Idempotence sends an update once and only one item. EOS is any function that can be executed several times without changing the final result beyond its first iteration

3. You want to connect with username and password to a secured Kafka cluster that has SSL encryption.
Which properties must your client include?

A) security.protocol=SSL
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';
B) security.protocol=SASL_SSL
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';
C) security.protocol=SASL_PLAINTEXT
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';
D) security.protocol=PLAINTEXT
sasl.jaas.config=org.apache.kafka.common.security.ssl.TlsLoginModule required username='myUser' password='myPassword';

4. Which two statements are correct about transactions in Kafka?
(Select two.)

A) Transactions are only possible when writing messages to a topic with single partition.
B) Transactions guarantee at least once delivery of messages.
C) All messages from a failed transaction will be deleted from a Kafka topic.
D) Consumers can consume both committed and uncommitted transactions.
E) Information about producers and their transactions is stored in the _transaction_state topic.

5. By default, which replica will be elected as a partition leader? (select two)

A) Preferred leader broker if it is in-sync and auto.leader.rebalance.enable=true
B) Preferred leader broker if it is in-sync and auto.leader.rebalance.enable=false
C) An in-sync replica
D) Any of the replicas

Solutions: