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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. We have a store selling shoes. What dataset is a great candidate to be modeled as a KTable in Kafka Streams?

A) Inventory contents right now
B) Items returned
C) Money made until now
D) The transaction stream

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

A) Idempotence sends updates multiple times and stores the first value. EOS sends updates multiple times and stores the latest value.
B) 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.
C) 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.
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. Which of the following event processing application is stateless? (select two)

A) Read events from a stream and modifies them from JSON to Avro
B) Read log messages from a stream and writes ERROR events into a high-priority stream and the rest of the events into a low-priority stream
C) Find the minimum and maximum stock prices for each day of trading
D) Publish the top 10 stocks each day

4. In Avro, removing a field that does not have a default is a __ schema evolution

A) backward
B) full
C) forward
D) breaking

5. A consumer sends a request to commit offset 2000. There is a temporary communication problem, so the broker never gets the request and therefore never responds. Meanwhile, the consumer processed another batch and successfully committed offset 3000. What should you do?

A) Add a new consumer to the group
B) Restart the consumer
C) Nothing
D) Use the kafka-consumer-group command to manually commit the offsets 2000 for the consumer group

Solutions: