CCAAK Exam Dumps : Confluent Certified Administrator for Apache Kafka

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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Kafka supports multiple listeners, allowing you to configure different security settings for internal and external traffic. For example, one listener can use PLAINTEXT for internal replication traffic, and another can use SASL_SSL for external client traffic.

From Kafka documentation:

“Kafka allows configuration of multiple listeners to segregate internal and external traffic, each with its own security protocol.”

B → Correct: Enables secure and isolated communication channels.

A → Unnecessary and inefficient.

C → Invalid: A single listener supports only one protocol.

D → Not a Kafka-level configuration.

Page Reference:

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

Apache Kafka Documentation: Security Configuration – Multiple Listeners

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Kafka architecture maintains exactly one active Controller at any given time, regardless of the number of brokers. The Controller is responsible for administrative tasks like partition leader election and topic creation. The remaining brokers are replicas, ready to take over if the Controller fails.

From Kafka documentation:

“At any given time, there is only one active controller in the Kafka cluster.”

Even in a cluster with 4 brokers, only 1 broker acts as the Controller.

Page Reference:

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

Apache Kafka Documentation: Controller Role Description

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