CCAAK Exam Dumps : Confluent Certified Administrator for Apache Kafka

Replication in Kafka ensures that partition data is copied across multiple brokers. This guarantees durability (data survives broker failure) and availability (other replicas can serve as leader if current leader fails).

From Kafka documentation:

“Replication ensures that data is not lost if a broker crashes and that messages remain available even during broker outages.”

B → Correct: Ensures persisted data even after failure.

C → Correct: Allows partition leader failover.

A → Incorrect: Replication may slightly reduce performance.

D → Incorrect: Replication is not a security mechanism.

Page Reference:

Kafka: The Definitive Guide, 1st Edition, Chapter 6, p. 189–191

Apache Kafka Documentation: Replication Overview

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Kafka consumers in a consumer group consume partitions exclusively. With 4 partitions and only 2 consumers, each consumer is processing 2 partitions. To increase parallelism, more consumers can be added to the group (up to 4) so that each consumer handles fewer partitions, which reduces the lag.

From Kafka documentation:

“Increasing the number of consumers in a group increases parallelism and helps reduce lag, assuming there are enough partitions.”

A → Ineffective unless followed by rebalancing and consumer scaling.

B → Would create a separate group and not share load.

C → Not applicable; consumers don’t acknowledge messages like producers.

Page Reference:

Kafka: The Definitive Guide, 1st Edition, Chapter 4, p. 127–129

Apache Kafka Documentation: Consumer Group Behavior

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To support gradual migration to SSL, Kafka supports configuring multiple listeners. You can run both a PLAINTEXT listener (for legacy clients) and an SSL listener (for new clients), allowing dual access.

From Kafka documentation:

“You can configure multiple listeners on a broker with different security protocols. This allows rolling out SSL while supporting legacy connections.”

A → Incorrect: Modifying the current listener breaks current clients.

B → Misleading: Changing advertised listeners affects how clients connect, which breaks backward compatibility.

C → Correct: Dual listeners allow phased SSL migration.

D → SSL must be configured on both ends to be effective.

Page Reference:

Kafka: The Definitive Guide, 1st Edition, Chapter 10, p. 305

Apache Kafka Documentation: Configuring Multiple Listeners

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