310-051 Exam

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Exam : Sun 310-051
Title : Sun Certified Enitrprise Architect for J2EE(TM)Technology


1. Your client is a bank that wants to allow its customers to access their bank accounts over the Internet. Given the following requirements, which protocol communicates with the Web browsers?
Confidential information must be protected.
Customers will access their account using only a simple Web browser with no extensions.
A. IIOP
B. HTTP
C. SNMP
D. HTTPS
Answer: D

2. Which two services does EJB provide? (Choose two.)
A. HTML generation
B. transaction services
C. lifecycle management
D. remote-method invocation
Answer: BC

3. What are two benefits of the Iterator pattern? (Choose two.)
A. It organizes collections into tree structures.
B. It performs a task for each object it visits in the collection.
C. It supports traversing the same collection in different orders.
D. Multiple Iterators can traverse the same collection simultaneously.
Answer: CD

4. These are the requirements for your new system:
All current business logic is in the form of database-stored procedures.
All current and new business logic is to be migrated to EJB.
The system is an online, Web-based system. The UI is HTML-based.
There are three EJBs: Customer, Order, and Account. There is one Java object, ShoppingList, which holds the current list of ordered items.
Only account and order data are stored in the database.
The Customer EJB maintains a reference to the ShoppingList.
Which three architectural decisions adhere to the requirements? (Choose three.)
A. make Order and Account an entity EJB
B. make Customer a stateful-session EJB
C. make Customer a stateless-session EJB
D. make Customer an entity EJB and put business logic in it
E. make Customer a session EJB and put business logic in it
F. use the Container Managed Persistence policy for the Customer session EJB
Answer: ABE

5. Which two features of a firewall might interfere with the operation of IIOP? (Choose two.)
A. port filtering
B. load balancing
C. address filtering
D. network address translation
Answer: AC

6. Which pattern is the most appropriate for allowing transparent access to a remote object?
A. Proxy
B. Facade
C. Memento
D. Singleton
E. Command
Answer: A

7. You are developing an HR application with the following requirements:
Users access the systems over an intranet, using a standard Web browser.
Organization information is stored in LDAP.
Benefits information is stored in an RDBMS.
Complaints are sent directly to a third-party system for compliance.
Which J2EE technology would send messages to the third-party complaint system?
A. EJB
B. JSP
C. JMS
D. JTA
E. JNDI
F. JDBC
Answer: C

8. What are two features of IIOP? (Choose two.)
A. It is secure.
B. It is connnectionless.
C. It is connection-based.
D. It is used for load balancing.
E. It is used for hypermedia requests.
F. It is used for remote-object communications.
Answer: CF

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