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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Clients that connect to a Kafka cluster are required to specify one or more brokers in the bootstrap.servers parameter.
What is the primary advantage of specifying more than one broker?

A) It provides redundancy in making the initial connection to the Kafka cluster.
B) It provides the ability to wake up dormant brokers.
C) It forces clients to enumerate every single broker in the cluster.
D) It is the mechanism to distribute a topic's partitions across multiple brokers.

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

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

3. You are writing to a topic with acks=all.
The producer receives acknowledgments but you notice duplicate messages.
You find that timeouts due to network delay are causing resends.
Which configuration should you use to prevent duplicates?

A) retries=0max.in.flight.requests.per.connection=5enable.idempotence=true
B) retries=2147483647max.in.flight.requests.per.connection=5enable.idempotence=true
C) enable.auto.commit=true
D) retries=2147483647max.in.flight.requests.per.connection=1enable.idempotence=false

4. Kafka producers can batch messages going to the same partition.
Which statement is correct about producer batching?

A) Producers have a separate background thread for each batch.
B) Producers can only batch messages of the same size.
C) Two or more broker failures will automatically disable batching on the producer.
D) Producers can include multiple batches in a single request to a broker.

5. This schema excerpt is an example of which schema format?
package com.mycorp.mynamespace;
message SampleRecord {
int32 Stock = 1;
double Price = 2;
string Product_Name = 3;
}

A) YAML
B) JSON Schema
C) Avro
D) Protobuf

Solutions: