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2021 May 1Z0-868 Study Guide Questions:

Q91. You are architecting a new Internet-deployed application and you want to restrict access to parts of the system for security purposes. Which three security restrictions can be specified in the deployment descriptor according to the servlet API specification standards? (Choose three.) 

A. on page forwarding 

B. on encryption methods 

C. based on the role name 

D. based on the user name 

E. based on the URL pattern 

F. based on the HTTP method 

Answer: C,E,F 

Q92. A company that makes avatar skins for virtual reality environments wants to deliver the textures that its customers purchase on the company's web site to its customer's avatar profile in-world. The target virtual reality environment can be communicated with from the outside-world using a web service. However, the web service invocation will fail if the customer is not online. Which architecture would be most appropriate to use in this situation? 

A. stateless session beans to attempt delivery 

B. invoke the web service from a JSF managed bean 

C. a JCA resource adapter to invoke the web service 

D. the EJB timer service to attempt delivery at regular intervals 

Answer: D 


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Q94. A company is the leading market developer of money management tools to stock market day traders. Traders access the tool over a secure VPN. The tool is accessed as a Java Swing application on the client, accessing a complex API on the server to achieve tasks, such as real- time pricing feeds, and security trading. No other technologies are used to access the API. Users typically log in at 7 a.m. every work day and remain logged in until 6:30 p.m. You are a subject matter expert in Java EE and have been asked to advise on how the next-generation API should be implemented. What do you recommend? 

A. implement the API as an RMI interface 

B. implement the API as a JMS Queue, accessed using a POJO 

C. implement the API as web services, generating and consuming XML messages 

D. implement the API as web services, generating and consuming SOAP messages 

Answer: A 

Q95. You are designing a company e-Commerce site. The site will be hosted on a single powerful server that has sufficient CPU, memory, storage, and network bandwidth so that clustering is not needed. The architecture must maintain session state including a shopping cart and recent searches. JSP and JPA have already been selected as the presentation tier and persistence tier 

A. an entity bean 

B. stateful session beans 

C. the HttpSession object 

D. a message-driven bean 

Answer: C 

Q96. A company is considering re-architecting their application from a two-tier to a three-tier architecture. To see what impact the new architecture would have on their non-functional requirements (NFRs), they created a prototype. When they tested the prototype based on their three-tier architecture they noticed, contrary to expectations, that the prototype was less scalable than the original two-tier solution. Which two statements explain the result? (Choose two.) 

A. Clients end up competing for CPU cycles on the common business logic tier. 

B. Clients end up competing for resources on the back-end database used by the application. 

C. Clients did NOT share interest in any domain objects, but the business tier spent too much time coordinating among clients anyway. 

D. Clients did NOT share interest in any domain objects and the business tier ran out of memory to represent all domain objects required by the clients. 

Answer: A,D 


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Q97. A teenage fashion website, has a multi-tier web application with 103 web servers, 12 middle-tier servers, and a large RDBMS server with more than enough capacity to support peak loads. You are the architect of the system, and you are concerned about reliability of the web application. Which change could you make to improve reliability? 

A. add additional web servers 

B. add additional database servers 

C. add additional middle-tier servers 

D. reduce the number of web servers 

E. reduce the number of middle-tier servers 

Answer: B 

Q98. An online sporting goods store's web application uses HTTPSession to store shopping carts. When the application is initially deployed, the business plan predicts only a few customers will access the site. Over time, the store projects a steady increase in volume. The deployment plan calls for a single web container in the initial deployment. As demand increases, the plan calls for multiple web containers on separate hardware with clustered HTTPSession objects. Which two principles will help the application meet the requirements and optimize performance? (Choose two.) 

A. The application should store as much as possible in HTTPSession objects. 

B. The application should NOT make frequent updates to HTTPSession objects. 

C. The application should make coarse-grained updates to HTTPSession objects. 

D. The application should create new HTTPSession objects instead of updating existing objects. 

Answer: B,C 

Q99. What describes the design relationship between session beans and entity beans? 

A. aggregation 

B. separation of concerns 

C. common reuse principle 

D. Liskov substitution principle 

E. interface segregation principle 

Answer: B 

Q100. A system architecture has two applications, one for billing and one for registration. The billing system is an older CORBA interface for updating billing information. The registration system is built using Java technology. A planned enhancement requires the registration application to automatically update the external billing system. Which Java technology is best suited for the enhancement? 



C. Java IDL 


Answer: C