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SUN CERTIFIED ENITRPRISE ARCHITECT FOR J2EE(tm)TECHNOLOGY : 310-051 Exam

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Exam Number/Code: 310-051

Exam Name: SUN CERTIFIED ENITRPRISE ARCHITECT FOR J2EE(tm)TECHNOLOGY

“SUN CERTIFIED ENITRPRISE ARCHITECT FOR J2EE(tm)TECHNOLOGY”, also known as 310-051 exam, is a SUN certification. With the complete collection of questions and answers, Pass4sure has assembled to take you through 96 questions to your 310-051 Exam preparation. In the 310-051 exam resources, you will cover every field and category in SUN Certifications helping to ready you for your successful SUN Certification.

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QUESTION 1
Your company’s employee assistance program (EAP) application is now required to be deployed on the
Web. The following are characteristics and requirements of the new system:
? The UI is an off-the-shelf, unsigned terminal-emulator applet.
? The applet communicates with a terminal server using a proprietary TCP/IP-based protocol.
? The terminal server sits behind the corporate firewall and listens on port 10001.
? The only configurable items for the applet are the host IP and port of the terminal server.
? You company’s firewall only allows traffic through on port 80 for HTTP and port 443 for HTTPS.
Problem: The applet is unable to communicate through the firewall.
Which two statements about this architecture are false? (Choose two)

A. If the applet were signed, it could communicate directly with the terminal server.
B. If the terminal server were signed, the applet could communicate with it directly on port 10001.
C. The applet can communicate with the terminal server if the firewall is modified to allow traffic through
on port 10001.
D. The applet can communicate with the terminal server if it is configured to communicate with the
terminal server on port 80 or 443.

Answer: A, B

QUESTION 2
Exhibit:

The current architecture consists of one Web server, three application servers, and a database. The new
architecture will add more Web servers.
Which two statements about the new architecture are false? (Choose two)

A. Adding more webservers will have a negative impact on scalability.
B. DNS round-robin can be used to load-distribute HTTP traffic to the Web servers.
C. When using HTTP, a load-balancer takes care of managing Web-server session states.
D. When using HTTPS, a load-balancer must route all traffic in the same session to the same Web server.

Answer: A, C

QUESTION 3
Which two improve software maintainability? (Choose two)

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A. Code factoring
B. Reusing components
C. Public instance variables
D. Dependencies between components
Answer: A, B

QUESTION 4
Exhibit:

In the exhibit, what is the relationship between A and C?

A. C depends on A
B. A depends on C.
C. A is a realization of C.
D. C is a realization of A.
E. C is an aggregation of A.
F. A is a specialization of C.
G. A is a generalization of C.
H. C is a specialization of A.

Answer: D

QUESTION 5
Exhibit:
Which two statements about the exhibit are true? (Choose two)

A. The object method doBaz() is self-called.
B. getBar() is a method in the C class.
C. getBar() is a class B accessor method.
D. The method doBaz() calls the getBar() method.
E. doBaz() will return its result to the method getFoo().

Answer: A, B

QUESTION 6
Exhibit:

The exhibit shows the communication between four EJBs.
Which change to the existing architecture helps increase performance?

A. Convert all entity beans to stateful session beans.
B. Convert all entity beans to stateless session beans.
C. Use bean-managed persistence for each entity bean.
D. Have each EJB hold a reference to the EJB it calls, instead of calling findByPrimaryKey().

Answer: D

QUESTION 7
Your supply chain software currently runs a standalone application which communicates to the backend
services using IIOP.
The new requirements for the software are:
* The client software must run as an applet.
* The user’s firewall will only allow port 80 and 443 traffic through its firewall.
* All the backend services will be CORBA-based.
* A Web server sits in front of the COBRA services.
* The backend Web server runs on port 80 and 443.
Which two solutions support the new requirements? (Choose two)

A. You convert the application to an applet and use IIOP to communicate with the backend services.
B. You convert the application to an applet running outside the browser and send XML through port 443.
C. You convert the application to an applet and use IIOP tunneled through HTTP to communicate with the
backend services.
D. You convert the application to an applet and use HTTPS to communicate with a servlet which
communicates with the backend services using IIOP.

Answer: C, D

QUESTION 8
Exhibit:

In the exhibit, what is the relationship between C and F?

A. C depends on F.
B. F depends on C.
C. F is a realization of C.
D. C is a realization of F.
E. C is an aggregation of F.
F. F is a specialization of C.
G. F is a generalization of C.
H. C is a specialization of F.

Answer: A
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