Pass4sure SOA S90.09 Dumps

Sample Questions

S90.09 Sample Question 1

You've been told that the reason Service Consumers A and C bypass the published

Service A service contract is because, for security reasons, they are not allowed to access

a subset of the operations in the WSDL definition that expresses the service contract. How

can the Service A architecture be changed to enforce these security restrictions while

avoiding negative forms of coupling?

A. The Contract Centralization pattern can be applied to force all service consumers toaccess the Service A architecture via its published service contract. This will preventnegative forms of coupling that could lead to problems when the database is replaced. TheService Abstraction principle can then be applied to hide underlying service architecturedetails so that future service consumers cannot be designed to access any part of theunderlying service implementation.
B. The Contract Centralization pattern can be applied to force service consumers to accessthe Service A architecture via its published service contract only. The Service LooseCoupling principle can then be applied to ensure that the centralized service contract doesnot contain any content that is dependent on or derived from the underlying serviceimplementation.
C. The Concurrent Contracts pattern can be applied to Service A in order to establish oneor more alternative service contracts. This allows service consumers with different levels ofsecurity clearance to continue accessing the service logic via its published servicecontracts.
D. None of the above.

ANSWER : C

S90.09 Sample Question 2

You are told that the current service composition architecture is having performance

problems because of two specific reasons. First, too many services need to be explicitly

invoked in order for the message to arrive at its destination. Secondly, because each of the

intermediary services is required to read the entire message contents in order to determine

where to forward the message to, it is taking too long for the overall task to complete. What

steps can be taken to solve these problems without sacrificing any of the functionality that

currently exists?

A. The Intermediate Routing pattern can be applied together with the Service Agent patternin order to establish a set of service agents capable of intercepting and forwarding themessage based on pre-defined routing logic. To avoid the need for service agents to readthe entire message contents, the Messaging Metadata pattern can be applied so thatcontent relevant to the routing logic is placed in the header of a message. This way, onlythe message header content needs to be read by the service agents.
B. The Intermediate Routing pattern can be applied together with the Service Agent patternin order to establish a set of service agents capable of intercepting and forwarding themessage based on pre-defined routing logic. To avoid the need for service agents to readthe entire message contents, the Rules Centralization pattern can be applied so thatcontent relevant to the routing logic is isolated into a separate Rules service. This way,service agents are only required to access the Rules service in order to determine where toforward messages to. The Standardized Service Contract principle will need to be appliedto ensure that the new Rules service and the new service agents provide service contractsthat are compliant to existing design standards.
C. The Intermediate Routing pattern can be applied together with the Service Agent patternin order to establish a set of service agents capable of intercepting and forwarding themessage based on pre-defined routing logic. The Service Discoverability principle can beapplied to improve the communications quality of message contents, which will reduce thetime required by service agents to read the message contents at runtime.
D. None of the above.

ANSWER : A

S90.09 Sample Question 3

Because Service A and Service B are not always available at the same times, messages

are getting lost and several invocation attempts by Service Consumer A fail. What steps

can be taken to solve this problem?

A. The Asynchronous Queuing pattern can be applied so that messaging queues areestablished between Service A and Service B and between Service Consumer A andService A . This way, messages are never lost due to the unavailability of Service A orService B .
B. The Asynchronous Queuing pattern can be applied so that a messaging queue isestablished between Service A and Service B . This way, messages are never lost due tothe unavailability of Service A or Service B . The Service Agent pattern can be furtherapplied to establish a service agent that makes a log entry and issues a notification whenre-transmission attempts by the messaging queue exceeds a pre-determined quantity.
C. The Asynchronous Queuing pattern can be applied so that a messaging queue isestablished between Service Consumer A and Service A. This way, messages are neverlost due to the unavailability of Service A or Service B. The Service Agent pattern can befurther applied to establish a service agent that makes a log entry each time a runtimeexception occurs.
D. None of the above.

ANSWER : A

S90.09 Sample Question 4

You've been given a requirement that all database updates must either be completed

successfully or not at all. This means that if any of the three response messages received

by Service A contain a failure code, all of the updates carried out until that point must be

reversed. Note that if Service A does not receive a response message back from Services

B, C, or D, it must assume that a failure has occurred. How can this service composition

architecture be changed to fulfill these requirements?

A. The Reliable Messaging pattern can be applied to guarantee the delivery of positive ornegative acknowledgements. This way, Service A will always be informed of whether afailure condition has occurred with any of the database updates performed by Services B,C, and D. Furthermore, the Service Loose Coupling principle can be applied to ensure thatthe request and response messages exchanged by the services do not contain anyimplementation details that would indirectly couple Service A to any of the databases.
B. The Atomic Service Transaction pattern can be applied individually to Services B, C,and D so that each of these services performs its own database update within the scope ofan atomic transaction. If anyone update fails, that change can be rolled back on thatdatabase. Furthermore, the Service Loose Coupling principle can be applied to ensure thatService A is kept out of the scope of the atomic transaction so that it is not negativelycoupled to the proprietary database technologies that are required to enable the atomictransaction functionality.
C. The Compensating Service Transaction can be applied to Service A so that when anyone response message containing a failure code is received by Service A, it can invokeexception handling logic that will log the failed database updates. The Service LooseCoupling principle can be further applied to ensure that Services B, C, or D are notindirectly coupled to the exception handling logic, especially if Service A requires additionalaccess to Services B, C, or D in order to collect more information for logging purposes.
D. None of the above.

ANSWER : D

S90.09 Sample Question 5

Currently, due to the increasing amount of concurrent access by service consumers, the

runtime performance of both the Client and Vendor services has worsened and has

therefore reduced their effectiveness as service composition members. What steps can be

taken to solve this problem without introducing new services?

A. The Rules Centralization pattern can be applied by extracting the business rule logicfrom the Client and Vendor services and placing it into a new Rules service. This willnaturally improve the runtime performance of the Client and Vendor services because theywill no longer be subjected to the high concurrent access of service consumers that requireaccess to the business rules logic.
B. The Redundant Implementation pattern can be applied to the Client and Vendorservices, thereby establishing duplicate implementations that can be accessed when aservice reaches its runtime usage threshold. The Intermediate Routing pattern can befurther applied to provide load balancing logic that can, at runtime, determine which of theredundant service implementations is the least busy for a given service consumer request.
C. The Rules Centralization pattern can be applied together with the RedundantImplementation pattern to establish a scalable Rules service that is redundantlyimplemented and therefore capable of supporting high concurrent access from manyservice consumers. The Service Abstraction principle can be further applied to hide theimplementation details of the Rules service.
D. None of the above.

ANSWER : B

S90.09 Sample Question 6

Assuming that the Invoice service, InvProc service, and ProcInv service are part of the

same service inventory, what steps would be required to fully apply the Official Endpoint

pattern?

A. One of the invoice-related services needs to be chosen as the official service providinginvoice data access capabilities. Service Consumers A, B, and C then need to beredesigned to only access the chosen invoice-related service. Because Service ConsumerD does not rely on an invoice-related service, it is not affected by the Official Endpointpattern and can continue to access the accounting database directly. The ServiceAbstraction principle can be further applied to hide the existence of the shared accountingdatabase and other implementation details from current and future service consumers.
B. One of the invoice-related services needs to be chosen as the official service providinginvoice data access capabilities. Service Consumers A, B, and C then need to beredesigned to only access the chosen invoice-related service. Service Consumer D alsoneeds to be redesigned to not access the shared accounting database directly, but to alsoperform its data access by interacting with the official invoice-related service. The ServiceAbstraction principle can be further applied to hide the existence of the shared accountingdatabase and other implementation details from current and future service consumers.
C. Because Service Consumers A, B, and C are already carrying out their data access viapublished contracts, they are not affected by the Official Endpoint pattern. ServiceConsumer D needs to be redesigned to not access the shared accounting databasedirectly, but to perform its data access by interacting with the official invoice-related service.The Service Abstraction principle can be further applied to hide the existence of the sharedaccounting database and other implementation details from current and future serviceconsumers.
D. None of the above.

ANSWER : B