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17. Which of the following are features of synchronous messaging A. Both parties must be active to participate. B. Messages must be acknowledged before proceeding. C. It decouples senders and receivers. D. It does not work with blocking calls. 18. Which of the following are not features of synchronous messaging A. Both parties must be active to participate. B. It is unaffected by increases in traffic volume. C. Message must be acknowledged before proceeding to the next. D. Message is queued until it is ready for processing.
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19. Which of the following scenarios are not suitable for publish/subscribe messaging model A. Sending an instant message B. Sending an order to another system C. Sending news stories to interested parties D. Sending a transaction to another system 20. What method must be implemented to receive messages in a message-driven bean (MDB) A. The receive method B. The onMessage method C. The readMessage method D. The processMessage method
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3 1. B and C are correct. Publish/subscribe messages use subject-based addressing and provide location-independence for publishers. A and D are incorrect. URLs are not used to identify publishers. Publish/subscribe is not limited to synchronous communication. 3 2. A and B are correct. receive() and receiveNoWait() are valid methods for TopicSubscriber. C and D are incorrect. receiveWait() and receiveSync() are not valid methods. 3 3. A and D are correct. Point-to-point and publish/subscribe are the messaging models supported in JMS. B and C are incorrect. Send/receive and transmit/receive are not valid messaging models. 3 4. A is correct. A message digest is a digital fingerprint value that is computed from a message, file, or byte stream. B, C, and D are incorrect. These are not definitions of a message digest. 3 5. D is correct. Authorizing user IDs and passwords must use a synchronous process. A, B, and C are incorrect. Receiving news stories, sales forecasts, and sending stock prices are suitable for asynchronous messaging. 3 6. A and B are correct. PERSISTENT and NON_PERSISTENT are valid delivery modes. C and D are incorrect. PERMANENT and DURABLE are invalid delivery modes. 3 7. A, B, and C are correct. AUTO_ACKNOWLEDGE, CLIENT_ACKNOWLEDGE, and DUPS_OK_ACKNOWLEDGE, are valid. D is incorrect. NO_ACKNOWLEDGE is an invalid message acknowledgment type. 3 8. D is correct. StringMessage is not a valid message body format. A, B, and C are incorrect. MapMessage, ObjectMessage, TextMessage are valid. 3 9. C is correct. MessageViewer is not a valid JMS object. A, B, and D are incorrect. MessageProducer, MessageConsumer, MessageSelector are valid. 3 10. A is correct. Topics are used in publish/subscribe messaging. B, C, and D are incorrect. These are valid classes in point-to-point messaging.
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3 11. A, B, and D are correct. Asynchronous architectures make better use of bandwidth, support leveling of workloads, and are more scalable. C is incorrect. These architectures do not provide senders with instant response. 3 12. A, B, and C are correct. Asynchronous messaging decouples senders and receivers, can increase performance, and is better suited to smaller message sizes. D is incorrect. Asynchronous messaging does not work with blocking calls.
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3 13. D is correct. The onMessage method must be implemented to receive messages asynchronously. A, B, and C are incorrect. The processMessage and readMessage methods do not exist. The receive method is used for synchronous messaging. 3 14. B is correct. A message is not acknowledged before a producer can send another in asynchronous messaging. A, C, and D are incorrect. These are valid features.
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3 15. A is correct. The receive method must be implemented to receive messages synchronously. B, C, and D are incorrect. The processMessage and readMessage methods do not exist. The onMessage method is used for asynchronous messaging. 3 16. B and D are correct. Credit card authorization and validation of data entered are better suited to synchronous messaging because of the need for an instant response. A and C are incorrect. Electronic mail and electronic processing of a tax return do not need instant responses. 3 17. A and B are correct. Both parties must be active to participate, and messages must be acknowledged before proceeding. C and D are incorrect. Synchronous messaging does not decouple senders and receivers and only works with blocking calls.
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