Confluent Confluent Certifications CCDAK Questions & Answers

• Question 51:

  We want the average of all events in every five-minute window updated every minute. What kind of Kafka Streams window will be required on the stream?

  A. Session window

  B. Tumbling window

  C. Sliding window

  D. Hopping window

  Correct Answer: D

  A hopping window is defined by two propertiesthe window's size and its advance interval (aka "hop"), e.g., a hopping window with a size 5 minutes and an advance interval of 1 minute.

• Question 52:

  I am producing Avro data on my Kafka cluster that is integrated with the Confluent Schema Registry. After a schema change that is incompatible, I know my data will be rejected. Which component will reject the data?

  A. The Confluent Schema Registry

  B. The Kafka Broker

  C. The Kafka Producer itself

  D. Zookeeper

  Correct Answer: A

  The Confluent Schema Registry is your safeguard against incompatible schema changes and will be the component that ensures no breaking schema evolution will be possible. Kafka Brokers do not look at your payload and your payload schema, and therefore will not reject data

• Question 53:

  A topic receives all the orders for the products that are available on a commerce site. Two applications want to process all the messages independently - order fulfilment and monitoring. The topic has 4 partitions, how would you organise the consumers for optimal performance and resource usage?

  A. Create 8 consumers in the same group with 4 consumers for each application

  B. Create two consumers groups for two applications with 8 consumers in each

  C. Create two consumer groups for two applications with 4 consumers in each

  D. Create four consumers in the same group, one for each partition - two for fulfilment and two for monitoring

  Correct Answer: C

  two partitions groups - one for each application so that all messages are delivered to both the application. 4 consumers in each as there are 4 partitions of the topic, and you cannot have more consumers per groups than the number of partitions (otherwise they will be inactive and wasting resources)

• Question 54:

  Consumer failed to process record # 10 and succeeded in processing record # 11. Select the course of action that you should choose to guarantee at least once processing

  A. Commit offsets at 10

  B. Do not commit until successfully processing the record #10

  C. Commit offsets at 11

  Correct Answer: B

• Question 55:

  How will you set the retention for the topic named ‚aumy-topic‚Au to 1 hour?

  A. Set the broker config log.retention.ms to 3600000

  B. Set the consumer config retention.ms to 3600000

  C. Set the topic config retention.ms to 3600000

  D. Set the producer config retention.ms to 3600000

  Correct Answer: C

  retention.ms can be configured at topic level while creating topic or by altering topic. It shouldn't be set at the broker level (log.retention.ms) as this would impact all the topics in the cluster, not just the one we are interested in

• Question 56:

  A Kafka producer application wants to send log messages to a topic that does not include any key. What are the properties that are mandatory to configure for the producer configuration? (select three)

  A. bootstrap.servers

  B. partition

  C. key.serializer

  D. value.serializer

  E. key

  F. value

  Correct Answer: ACD

  Both key and value serializer are mandatory.

• Question 57:

  What information isn't stored inside of Zookeeper? (select two)

  A. Schema Registry schemas

  B. Consumer offset

  C. ACL inforomation

  D. Controller registration

  E. Broker registration info

  Correct Answer: AC

• Question 58:

  A Zookeeper configuration has tickTime of 2000, initLimit of 20 and syncLimit of 5. What's the timeout value for followers to connect to Zookeeper?

  A. 20 sec

  B. 10 sec

  C. 2000 ms

  D. 40 sec

  Correct Answer: D

  tick time is 2000 ms, and initLimit is the config taken into account when establishing a connection to Zookeeper, so the answer is 2000 * 20 = 40000 ms = 40s

• Question 59:

  Once sent to a topic, a message can be modified

  A. No

  B. Yes

  Correct Answer: A

  Kafka logs are append-only and the data is immutable

• Question 60:

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

  A. It compresses the messages as it writes to the disk

  B. It leverages zero-copy optimisations to send data straight from the page-cache

  C. It buffers the messages on disk, and sends messages from the disk reads

  D. It transforms the messages into a binary format

  E. It does not transform the messages

  Correct Answer: BE

  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