310-052 Exam

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Exam : SUN 310-052
Title : Sun Certified Enterprise Architect for J2EE 5


1. A stock trading company is writing a new application for stock market forecasting. A significant portion of the work required by the business logic involves navigating through the persistent object model. As lead architect on this project, you have chosen JPA over EJB2 entity beans to implement these persistent objects. You have done this to maximize performance when navigating through the model. Why does JPA offer better performance for this task?
A. JPA guarantees referential integrity at the object level.
B. JPA allows the application to specify lazy or eager retrievals.
C. JPA simplifies the source code that implements the object model.
D. The guaranteed referential integrity in EJB2 entity beans is expensive.
Answer: B

2. A developer creates a Java web service to be used by consumers in an SOA. This SOA uses a UDDI service registry. How can the developer make the new service available to consumers?
A. deploy to the registry using JAXR
B. publish to the registry using JAXR
C. query the registry using JAX-RPC
D. target the registry using JAX-RPC
Answer: B

3. With the release of a new product line, there has been a significant increase in the volume of transactions on your web site. You need to scale your application and manage session failover. What is the best option for scalability?
A. add additional web servers and application servers
B. introduce a High Availability pair and utilize sticky sessions
C. add additional application servers and implement DNS round robin
D. add additional application servers and use clustered HttpSession
Answer: D

4. What are the three primary roles in a web service interaction? (Choose three.)
A. Broker
B. Facade
C. Provider
D. Decorator
E. Requestor
F. Interceptor
Answer: ACE

5. You are asked to architect an SOA solution that leverages Java web services. The architecture needs to be flexible and allow for the SOAP 1.1, SOAP 1.2, and REST implementations. Which Java EE technology should you use?
A. JAXP
B. JAXB
C. JAX-WS
D. JAX-RPC
Answer: C

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