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Confluent CCDAK Exam Syllabus Topics:

SectionObjectives
Topic 1: Kafka Fundamentals- Kafka architecture and core concepts
  • 1. Replication and fault tolerance
    • 2. Brokers, topics, partitions
      - Data flow in Kafka
      • 1. Producer and consumer model
        • 2. Offset management
          Topic 2: Kafka Ecosystem and Confluent Platform- ksqlDB and connectors
          • 1. Stream querying concepts
            • 2. Kafka Connect basics
              - Schema Registry
              • 1. Avro, Protobuf, JSON Schema usage
                Topic 3: Kafka Producers and Consumers- Consumer API
                • 1. Rebalancing and offset commits
                  • 2. Consumer groups
                    - Producer API
                    • 1. Serialization and partitioning strategies
                      • 2. Reliability and acknowledgments
                        Topic 4: Kafka Streams and Processing- Kafka Streams API
                        • 1. Stateful vs stateless processing
                          • 2. Stream processing fundamentals
                            - Event processing patterns
                            • 1. Windowing and aggregation
                              • 2. Exactly-once semantics

                                >> CCDAK復習教材 <<

                                効率的なCCDAK復習教材一回合格-権威のあるCCDAK資格勉強

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                                Confluent Certified Developer for Apache Kafka Certification Examination 認定 CCDAK 試験問題 (Q84-Q89):

                                質問 # 84
                                Which two statements are correct about transactions in Kafka?
                                (Select two.)

                                正解:B、C

                                解説:
                                Comprehensive and Detailed Explanation From Exact Extract:
                                * #C. Consumers can consume both committed and uncommitted transactions.By default,Kafka consumers only read committed messagesif they are configured with isolation.level=read_committed.
                                However, if configured as read_uncommitted, theycan also consume uncommitted (potentially aborted) transactional messages.
                                From Kafka Documentation:
                                "The isolation.level setting controls whether the consumer will read only committed messages or all messages, including uncommitted messages from ongoing or aborted transactions."
                                * #D. Information about producers and their transactions is stored in the _transaction_state topic.
                                Kafka uses an internal topic named__transaction_stateto maintain metadata about producer transactions. This topic is essential for tracking thetransaction lifecycle, fencing, and recovery.
                                From Kafka Internals:
                                "Kafka stores the state of active and completed transactions in an internal topic called __transaction_state."


                                質問 # 85
                                What are stateful operations in Kafka Streams API? (Choose 2.)

                                正解:C、D


                                質問 # 86
                                If you enable an SSL endpoint in Kafka, what feature of Kafka will be lost?

                                正解:B

                                解説:
                                With SSL, messages will need to be encrypted and decrypted, by being first loaded into the JVM, so you lose the zero copy optimization. See more information herehttps://twitter.com/ijuma/status/1161303431501324293?s=09


                                質問 # 87
                                You create a producer that writes messages about bank account transactions from tens of thousands of different customers into a topic.
                                Your consumers must process these messages with low latency and minimize consumer lag Processing takes ~6x longer than producing Transactions for each bank account must be processed in orderWhich strategy should you use?

                                正解:C

                                解説:
                                To maintain message ordering per bank account, the message key must be the account number. Kafka guarantees ordering per partition, and the partition is selected based on the hash of the key.
                                From Kafka Producer Docs:
                                "All records with the same key will be sent to the same partition, and Kafka preserves the order of records in a partition." Using account number ensures:
                                All messages for the same account go to the same partition
                                Order is maintained
                                Workload is evenly distributed if account keys are varied
                                Other options break ordering or introduce unnecessary randomness.
                                Reference: Kafka Producer Concepts > Partitions and Keys


                                質問 # 88
                                You are composing a REST request to create a new connector in a running Connect cluster. You invoke POST /connectors with a configuration and receive a 409 (Conflict) response.
                                What are two reasons for this response? (Select two.)

                                正解:B、D

                                解説:
                                A409 Conflictresponse in Kafka Connect REST API usually means:
                                * The connector name provided already exists (i.e., a connector with that name is already deployed).
                                * The Kafka Connect cluster is temporarily unavailable to accept new tasks due toa rebalance in progress.
                                From theConfluent Developer documentationand Kafka Connect REST API spec:
                                "409 - Conflict. The connector name is already in use or the worker group is in the process of rebalancing and cannot complete the request at this time." Option A is incorrect because invalid configurations return400 Bad Request, not 409.
                                Option B is invalid because Kafka Connect does not have a strict concept of "capacity" that prevents connector creation with a 409.
                                Reference:Apache Kafka Connect REST API documentation


                                質問 # 89
                                ......

                                私たちが知っているように、一部の人々は以前に試験に失敗し、CCDAKトレーニング資料を購入する前にこの苦しい試験に自信を失いました。私たちはここで悲しみを分けます。これから時間のかかる思考を捨てることができます。対照的に、それらは不明瞭なコンテンツを感じることなくあなたの可能性を刺激します。 CCDAK試験準備を取得した後、試験期間中に大きなストレスにさらされることはありません。

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