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Code d'Examen: S90-02A
Nom d'Examen: SOA Certified Professional (SOA Technology Concepts)
Questions et réponses: 92 Q&As

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NO.1 When designing REST services within a given domain, you establish __________________ that are
represented by unique identifiers, usually in the format of __________________.
A. resources, HTTPs/HTTPSs
B. mashups, HTTPs/HTTPSs
C. resources, URLs/URIs
D. mashups, URLs/URIs
Answer: C

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NO.2 A __________________ establishes a common access point generally based on HTTP methods used
by __________________.
A. WSDL definition, SOAP-based Web service
B. uniform contract, REST services
C. XML schemas, components
D. None of the above
Answer: B

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NO.3 SOAP-based Web services can be designed for use within traditional RPC-style distributed solutions
or for use in service-oriented solutions.
A. True
B. False
Answer: A

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NO.4 A SOAP-based Web service is required to transmit an XML-based invoice document to a REST
service. However, the SOAP-based Web service is designed to represent invoice data using an XML
schema that is different from the XML schema used within the REST service. How can the disparity
between the XML schemas, used by these two services, be overcome so that they can exchange the
invoice document?
A. A layer of data format transformation logic needs to be introduced based on mashup technologies,
such as DTD and WS-Transform.
B. A layer of protocol transformation logic needs to be introduced based on Web technologies, such as
HTTP and FTP.
C. A layer of data model transformation logic needs to be introduced, based on XML technologies, such
as XSLT.
D. There is no technique or technology for overcoming differences between XML schemas.
Answer: C

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NO.5 XML can be used to structure data passed between REST services, but REST introduces rules that limit
the extent to which XML elements and attributes can be nested.
A. True
B. False
Answer: B

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NO.6 When two compatible SOAP-based Web services need to exchange an XML document that is
compliant with the XML schema shared by both services, then:
A. A data model transformation technology, such as XSLT, must be used to enable the data exchange.
B. A new XML schema must be created to overcome the disparity between how each service defines the
data model for the XML document.
C. A WS-Policy definition must be created to establish rules that address any differences in the XML
document exchange.
D. None of the above.
Answer: D

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NO.7 Which of the following are associated with the functionality provided by a typical enterprise service
bus?
A. reliable message delivery
B. intermediate message routing
C. temporary storage of messages in queues
D. All of the above.
Answer: D

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NO.8 Which of the following statements is true.?
A. WS-ReliableMessaging standardizes reliability levels associated with databases required to persist
state data.
B. WS-ReliableMessaging standardizes the issuance and delivery of positive and negative
acknowledgement messages.
C. WS-ReliableMessaging standardizes SOAP headers related to atomic transactions with rollback
features.
D. WS-ReliableMessaging standardizes the expression of service composition logic, but only for
SOAP-based Web services.
Answer: B

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NO.9 If Service B is invoked by Service A and then Service B invokes Service C and all of this happens as
part of the same service activity, then Service B would be considered:
A. an intermediary
B. a service agent
C. an ultimate receiver
D. an initial sender
Answer: A

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NO.10 Which of the following statements is true?
A. Service activities represent runtime activity that occurs within the underlying service logic.
B. Service activities represent design-time message exchanges that are established between
SOAP-based Web services and defined as part of the operation definition within the WSDL definition.
C. Service activities represent runtime activity that occurs between services.
D. Service activities represent runtime activity that occurs between complex and simple XML Schema
types.
Answer: C

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NO.11 Data model transformation is a core service function that can be performed by proven technologies
that have been around for years. Therefore, it is recommended that you look for opportunities to apply this
technology wherever possible, especially in larger, more complex service compositions.
A. True
B. False
Answer: B

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NO.12 XML schemas are comparable to database records. Therefore, XML documents that are based on
XML schemas are comparable to database data models.
A. True
B. False
Answer: B

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NO.13 Which of the following statements is true?
A. An enterprise service bus commonly provides service broker-related features that allow two services
using different data models (that represent the same business document) to communicate with each
other.
B. An enterprise service bus commonly provides service broker-related features that allow two services
using different communication protocols to communicate with each other.
C. An enterprise service bus commonly provides service broker-related features that allow two services to
communicate even though they use different communication protocols and different data models (that
represent the same business document).
D. All of these statements are true.
Answer: D

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NO.14 WS-Addressing is most commonly associated with __________________ functionality.
A. process management
B. policy enforcement
C. message routing
D. choreography
Answer: C

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NO.15 Which of the following statements is false?
A. The WS-I is an industry standards organization that provides basic profiles to help foster
interoperability among solutions based on XML and Web services industry standards.
B. OASIS is an industry standards organization that has developed a number of important technology
specifications, including WS-BPEL and UDDI.
C. The W3C is a standards organization that has developed a number of important technology
specifications, including SOAP, WSDL, and WS-Addressing.
D. The OAS-C is an industry standards organization that has developed a number of important
technology specifications, including WS-Security and XML Schema.
Answer: D

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NO.16 A SOAP message is an XML document that is comprised of a set of pre-defined parts. Which of the
following are parts that can be found in a SOAP message?
A. Envelope
B. Body
C. Header
D. Footer
Answer: A,B,C

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NO.17 The XML language is expressed through the use of:
A. elements or tags
B. databases or repositories
C. services or components
D. service compositions or orchestrations
Answer: A

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NO.18 Which of the following statements is true?
A. Individual service contracts do not need to be published for SOAP-based Web services. Instead, they
use a uniform contract.
B. Individual service contracts do not need to be published for REST services. Instead, they use a
common uniform contract.
C. Components provide published contracts, but when building services as components, components
must use a uniform contract instead.
D. None of these statements are true.
Answer: B

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NO.19 I would like to extend my WSDL definition to include a programmatically consumable statement that
communicates that upon receiving a message the service will add an entry to an event log. Which
technology should I use?
A. Mashup
B. XSLT
C. REST
D. None of the above.
Answer: D

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NO.20 Identify what is wrong with the following statement: "I have a single Calculator component that provides
basic math functions. I'm exposing this component as a component-based service for internal service
consumers that are also component-based. I'm exposing this component as a SOAP-based Web service
for internal and external service consumers that support SOAP messaging. I'm also exposing this
component as a REST service for external service consumers that prefer to access its functions via HTTP
methods. I'm also exposing this component as a service agent for service consumers that support explicit
invocation via a service contract."
A. A single component cannot be exposed as a component-based service, a SOAP-based Web service
and a REST service at the same time.
B. SOAP-based Web service consumer programs cannot be both internally and externally located.
C. The uniform contract required by REST services does not support the use of HTTP methods.
D. Service agents are event-driven and are therefore not explicitly invoked via a service contract.
Answer: D

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Code d'Examen: S90-20A
Nom d'Examen: SOA Certified Professional (SOA Security Lab)
Questions et réponses: 30 Q&As

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NO.1 Service A exchanges messages with Service B multiple times during the same runtime service activity.
Communication between Services A and B has been secured using transport-layer security. With each
service request message sent to Service B (1A. IB), Service A includes an
X.509 certificate, signed by an external Certificate Authority (CA). Service B validates the certificate by
retrieving the public key of the CA (2A. 2B) and verifying the digital signature of the
X.509 certificate. Service B then performs a certificate revocation check against a separate external CA
repository (3A, 3B). No intermediary service agents reside between Service A and Service B.
To fulfill a new security requirement, Service A needs to be able to verify that the response message sent
by Service B has not been modified during transit. Secondly, the runtime performance between Services
A and B has been unacceptably poor and therefore must be improved without losing the ability to verify
Service A's security credentials. It has been determined that the latency is being caused by redundant
security processing carried out by Service B.
Which of the following statements describes a solution that fulfills these requirements?
A. Apply the Trusted Subsystem pattern to introduce a utility service that performs the security processing
instead of Service B. The utility service can verify the security credentials of request messages from
Service A and digitally sign messages sent to Service A to enable verification of message integrity.
Furthermore, the utility service can perform the verification of security credentials submitted by Service A
only once per runtime service activity. After the first messageexchange, it can issue a SAML token to
Service A that gets stored within the current session. Service A can then use this session-based token
with subsequent message exchange. Because SAML tokens have a very small validity period (in contrast
to X.509 certificates), there is no need to perform a revocation check with every message exchange.
B. Service B needs to be redesigned so that it performs the verification of request messages from Service
A only for the first message exchange during the runtime service activity. Thereafter, it can issue a SAML
token to Service A that gets stored within the current session. Service A then uses this session-based
token with subsequent message exchanges. Because SAML tokens have a very small validity period (in
contrast to X.509 certificates), there is no need to perform a revocation check with every message
exchange.
C. WS-SecurityPolicy transport binding assertions can be used to improve performance via
transport-layer security The use of symmetric keys can keep the encryption and decryption overhead to a
minimum, which will further reduce the latency between Service A and Service B. By encrypting the
messages, attackers cannot modify message contents, so no additional actions for integrity verification
are needed.
D. The Data Origin Authentication pattern can be applied together with the Service Perimeter Guard
pattern to establish a perimeter service that can verify incoming request messages sent to Service B and
to filter response messages sent to Service A. The repository containing the verification information about
the Certificate Authorities can be replicated in the trust domain of the perimeter service. When access is
requested by Service A, the perimeter service evaluates submitted security credentials by checking them
against the locally replicated repository. Furthermore, it can encrypt messages sent to Service A by
Service B. and attach a signed hash value.
Answer: A

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NO.2 Service Consumer A sends a request message to Service A (1) after which Service A retrieves financial
data from Database A (2). Service A then sends a request message with the retrieved data to Service B
(3). Service B exchanges messages with Service C (4) and Service D (5), which perform a series of
calculations on the data and return the results to Service A. Service A uses these results to update
Database A (7) and finally sends a response message to Service Consumer A (8). Component B has
direct, independent access to Database A and is fully trusted by Database A. Both Component B and
Database A reside within Organization A. Service Consumer A and Services A, B, C, and D are external to
the organizational boundary of Organization A.
Component B is considered a mission critical program that requires guaranteed access to and fast
response from Database A. Service A was recently the victim of a denial of service attack, which resulted
in Database A becoming unavailable for extended periods of time (which further compromised
Component B). Additionally, Services B, C, and D have repeatedly been victims of malicious intermediary
attacks, which have further destabilized the performance of Service A.
How can this architecture be improved to prevent these attacks?
A. A utility service is created to encapsulate Database A and to assume responsibility for authenticating all
access to the database by Service A and any other service consumers. Due to the mission critical
requirements of Component B, the utility service further contains logic that strictly limits the amount of
concurrent requests made to Database A from outside the organizational boundary. The Data
Confidentiality and Data Origin Authentication patterns are applied to all message exchanged within the
external service composition in order to establish message-layer security.
B. Service Consumer A generates a private/public key pair and sends this public key and identity
information to Service A. Service A generates its own private/public key pair and sends it back to Service
Consumer A. Service Consumer A uses the public key of Service A to encrypt a randomly generated
session key and then sign the encrypted session key with the private key. The encrypted, signed session
key is sent to Service A. Now, this session key can be used for secure message-layer communication
between Service Consumer A and Service A. The Service Perimeter Guard pattern is applied to establish
a perimeter service that encapsulates Database A in order to authenticate all external access requests.
C. Services B, C, and D randomly generate Session Key K, and use this key to encrypt request and
response messages with symmetric encryption. Session Key K is further encrypted itself asymmetrically.
When each service acts as a service consumer by invoking another service, it decrypts the encrypted
Session Key K and the invoked service uses the key to decrypt the encrypted response. Database A is
replicated so that only the replicated version of the database can be accessed by Service A and other
external service consumers.
D. The Direct Authentication pattern is applied so that when Service Consumer A submits security
credentials, Service A will be able to evaluate the credentials in order to authenticate the request
message. If the request message is permitted, Service A invokes the other services and accesses
Database A. Database A is replicated so that only the replicated version of the database can be accessed
by Service A and other external service consumers.
Answer: A

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Code d'Examen: S90-04A

Nom d'Examen: SOA Certified Professional (SOA Project Delivery & Methodology)

Questions et réponses: 100 Q&As

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NO.1 Which of the following statements is false?
A. With the bottom-up approach, services are built on an "as need" basis and are modeled to encapsulate
application logic to best serve the immediate requirements of the solution.
B. The bottom-up approach is often motivated by integration needs that may require establishing
point-to-point integration channels between legacy systems.
C. The bottom-up approach is focused primarily on maximizing service reuse. Therefore, special attention
is paid to the documentation of service profile information that is used to create complete service catalog
entries.
D. The bottom-up approach can result in the creation of hybrid services that contain a mix of logic from
different sources.
Answer: C

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NO.2 Top-down approaches typically ____________ the long-term governance burden of services.
A. increase
B. decrease
C. eliminate
D. None of the above.
Answer: B

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NO.3 An SOA project carried out with a top-down approach can contain phases that require the completion
of the following tasks:
A. development of services
B. design of services
C. analysis of services
D. testing of services
Answer: A,B,C,D

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NO.4 Two service delivery projects are being carried out concurrently. Each project has its own project team.
Even though both projects are delivering services for the same service inventory, each project team is
given complete independence as to how services are designed and developed and what design
standards are to be used. Which of the following statements describes a likely consequence of this
approach.?
A. The service inventory will be comprised of services that comply to different design standards and these
services will therefore not be compatible or interoperable.
B. Services with redundant and overlapping logic may be delivered because no effort was made to
coordinate the delivery of the services between the two projects.
C. One project team may decide to follow a top-down delivery approach, whereas the other project team
may follow a bottom-up delivery approach.
D. All of the above.
Answer: D

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NO.5 Which of the following statements is true?
A. The meet-in-the-middle delivery approach allows an on-going top-down analysis to occur while
services are designed and delivered. The only requirement is that delivered services eventually be
updated to be kept in alignment with the results of the top-down analysis.
B. The meet-in-the-middle delivery approach is essentially based on the bottom-up approach in that it
allows services to be delivered without up-front analysis. The only difference is that the
meet-in-the-middle approach advocates the use of object-orientation principles instead of
service-orientation principles.
C. The meet-in-the-middle delivery approach is essentially based on the top-down approach in that it
allows services to be delivered after the completion of the top-down analysis. The only difference is that
the meet-in-the-middle approach advocates the use of people that act as mediators who ensure that
business analysts and technology architects can collaborate harmoniously.
D. None of these statements are true.
Answer: A

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NO.6 The primary deliverable of the service inventory analysis is a ____________ of the service inventory.
A. blueprint
B. contract
C. composition architecture
D. legend
Answer: A

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NO.7 A service candidate is:
A. a conceptual service
B. a proposed service that may not yet physically exist
C. a modeled service produced via a service modeling process
D. a modeled service that initially acts as the starting point for the physical design of the service
Answer: A,B,C,D

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NO.8 Which of the following tends to be the most expensive and time consuming project delivery strategy?
A. bottom-up
B. top-down
C. meet-in-the-middle
D. round-about
Answer: C

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NO.9 Which of the following statements makes sense?
A. We delivered the project using a meet-in-the-middle approach, which allowed us to start building
services before completing our top-down analysis.
B. We delivered the project using a meet-in-the-middle approach, which allowed us to complete our
service inventory blueprint before delivering our services.
C. We delivered the project using a meet-in-the-middle approach, which allowed us to bypass up-front
analysis altogether so that we could build our services in the shortest possible timeframe.
D. None of these statements make sense.
Answer: A

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NO.10 In a service-oriented analysis process, business and technology experts are encouraged to
collaborate hands-on so that they can jointly model service candidates.
A. True
B. False
Answer: A

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NO.11 Bottom-up delivery is generally focused on fulfilling ____________ requirements while top-down
delivery is generally focused on fulfilling ____________ requirements.
A. tactical (short-term), tactical (short-term)
B. strategic (long-term), strategic (long-term)
C. tactical (short-term), strategic (long-term)
D. strategic (long-term), tactical (short-term)
Answer: C

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NO.12 The Claims Solution project is responsible for delivering a service composition comprised of seven
services. The project team is following a meet-in-the-middle approach whereby a service analyst and two
service architects will continue carrying out a top-down analysis effort after the initial set of services is
designed and developed. What will happen after the top-down analysis completes and the final service
candidates are noticeably different from the services that have already been delivered?
A. The previously delivered services remain in use until they can no longer fulfill their functional
requirements, at which point they are retired and replaced with new services based on the final service
candidates.
B. The previously delivered services are later redesigned and redeveloped as per the final service
candidates in order to bring the services in the Claims Solution in alignment with the target service
inventory blueprint.
C. The previously delivered services are not changed and the final service candidates serve as a constant
reminder as to how they should have been designed.
D. None of the above.
Answer: B

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NO.13 Which of the following statements makes sense?
A. The bottom-up approach is tactical (short-term) and therefore advocates that up-front analysis effort be
carried out before the service inventory blueprint is finalized.
B. The top-down approach is tactical (short-term) and therefore advocates that up-front analysis effort be
carried out before the service inventory blueprint is finalized.
C. The bottom-up approach is strategic (long-term) and therefore advocates that up-front analysis effort
be carried out before the service inventory blueprint is finalized.
D. The top-down approach is strategic (long-term) and therefore advocates that up-front analysis effort be
carried out before the service inventory blueprint is finalized.
Answer: D

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NO.14 SOA projects introduce new considerations that tend to augment the traditional project lifecycle as
follows:
A. they tend to introduce the need for more up-front analysis effort
B. they tend to require closer collaboration between business and technology experts
C. they tend to require a careful prioritization of tactical (short-term) and strategic (long-term)
requirements
D. they tend to introduce new project roles
Answer: A,B,C,D

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NO.15 The Inventory Management System project is delivering a modest solution comprised of three services.
The project team is following a bottom-up approach whereby service developers are building the services
to fulfill tactical (short-term) requirements. Although not everyone agrees with this approach, it does
actually directly support the following service-oriented computing goal:
A. Increased Intrinsic Interoperability
B. Increased Business and Technology Alignment
C. Increased Federation
D. None of the above.
Answer: D

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Code d'Examen: S90-05A

Nom d'Examen: SOA Certified Professional (SOA Technology Lab)

Questions et réponses: 40 Q&As

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NO.1 Your company has developed a service that allows your customers to check the status of an order. The
schema for the service is shown here:
A new customer plans to use your service, but they want to test it first. They have asked for two sample
XML documents that show typical input and output message content. Which of the following pairs of XML
elements will validate with the schema shown above?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D

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NO.2 A partner organization has given you samples of XML documents retrieved from their product
information database. The three samples they have sent you are: Because they are an important partner,
you have agreed to write a service to accept XML documents in their format. However, they did not send
you a schema, so you are tasked with defining a schema that will correctly validate their documents.
Which of the following XML schemas will successfully validate each of the above XML document
fragments.?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B

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NO.3 Your company has developed a PO service that allows customers to submit purchase order documents.
The message sent by a customer must be based on a predefined "purchaseOrder" element and the
message received by the customer is based on a "messageAcknowledgement" element. These two
elements are defined in the following two separate XML Schema definitions: The "purchaseOrder.xsd"
schema:
Note that these two schemas have different namespaces. That is because the "purchaseOrder.xsd"
schema is specific to purchase order-related functions, while the "ack.xsd" schema is more generic and
used for a variety of different purposes.
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A

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NO.4 You are a consultant helping a large bank implement an on-line banking service for its customers. The
first operation you need to build is one that allows a customer to initiate a transfer of funds. You are
presented with the following sample XML document that represents the funds transfer information that
this operation needs to be able to receive:
<transfer>
< fromAccount>12345 </fromAccount>
< toAccount>44432 </toAccount>
<amount>2000</amount>
</transfer>
You are also provided with the following sample that shows that the response message sent by the
service needs to return a single element with text content:
<transferStatus>SUCCESS</transferStatus>
Which of the following XML schemas will validate the two samples shown above?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: C

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NO.5 Your developer is asked to build a Timesheet service that is able to receive timesheet submissions for
an internal payroll system. Service consumers need to be able to send this service request message
based on a root "employeeHours" element within the SOAP message body. The "employeeHourse"
element will contain "ernpID" and "hours" child elements. Furthermore, the service needs to return a
message based on a "response" element that contains "empID" and "status" child elements.
Your developer comes to you with the following WSDL definition: The only revision you suggest is that the
value of the "style" attribute of the "soap: binding" element be changed to "document" instead of "rpc".
Why?
A. With a value of "rpc", the root element within the SOAP message body will have the name of the
operation, and therefore cannot be named "employeeHours" as indicated by the requirements.
B. With a value of "rpc", the root element within the SOAP message body is unable to be part of an
operation that contains both "input" and "output" elements.
C. The value of "rpc" is not a valid value for the "style" attribute.
D. None of the above.
Answer: A

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Code d'Examen: C90-01A

Nom d'Examen: SOA Certified Professional (Fundamental Cloud Computing(C90.01))

Questions et réponses: 69 Q&As

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NO.1 The Limited Portability Between Cloud Providers challenge of cloud computing can occur when an
absence of industry standards (or an absence of compliance to industry standards) requires that cloud
consumers build cloud-based solutions to conform to proprietary requirements imposed by cloud
providers. This makes it more difficult to move to new cloud providers in the future.Select the correct
answer.
A. True
B. False
Answer: A

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NO.2 .A(n) ____________________ cloud is a cloud environment owned by a third-party cloud provider and
accessible to external cloud consumers. The IT resources in the cloud are generally offered to cloud
consumers at a cost. Select the correct answer.
A. public
B. on-premise
C. private
D. None of the above.
Answer: A

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NO.3 Service agents are provided only by runtime environments and operating systems. As a result, service
agents cannot be custom-developed. Select the correct answer.
A. True
B. False
Answer: B

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NO.4 Measured usage is only limited to tracking statistics for billing purposes. It does not encompass the
general monitoring of IT resources and related usage reporting. Therefore, measured usage is only
relevant to clouds that charge for usage. Select the correct answer. ?
A. True
B. False
Answer: B

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NO.5 Which of the following are common types of cloud service consumers? SelectALL THAT APPLY
A. Software programs capable of remotely accessing cloud services with published service contracts.
B. Services capable of remotely accessing cloud services with published service contracts.
C. Humans that use workstations running software capable of remotely accessing IT resources positioned
as cloud services.
D. Mobile devices running software capable of remotely accessing IT resources positioned as cloud
services.
Answer: A,B,D

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Code d'Examen: S90-20A

Nom d'Examen: SOA Certified Professional (SOA Security Lab)

Questions et réponses: 30 Q&As

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NO.1 Service A exchanges messages with Service B multiple times during the same runtime service activity.
Communication between Services A and B has been secured using transport-layer security. With each
service request message sent to Service B (1A. IB), Service A includes an
X.509 certificate, signed by an external Certificate Authority (CA). Service B validates the certificate by
retrieving the public key of the CA (2A. 2B) and verifying the digital signature of the
X.509 certificate. Service B then performs a certificate revocation check against a separate external CA
repository (3A, 3B). No intermediary service agents reside between Service A and Service B.
To fulfill a new security requirement, Service A needs to be able to verify that the response message sent
by Service B has not been modified during transit. Secondly, the runtime performance between Services
A and B has been unacceptably poor and therefore must be improved without losing the ability to verify
Service A's security credentials. It has been determined that the latency is being caused by redundant
security processing carried out by Service B.
Which of the following statements describes a solution that fulfills these requirements?
A. Apply the Trusted Subsystem pattern to introduce a utility service that performs the security processing
instead of Service B. The utility service can verify the security credentials of request messages from
Service A and digitally sign messages sent to Service A to enable verification of message integrity.
Furthermore, the utility service can perform the verification of security credentials submitted by Service A
only once per runtime service activity. After the first messageexchange, it can issue a SAML token to
Service A that gets stored within the current session. Service A can then use this session-based token
with subsequent message exchange. Because SAML tokens have a very small validity period (in contrast
to X.509 certificates), there is no need to perform a revocation check with every message exchange.
B. Service B needs to be redesigned so that it performs the verification of request messages from Service
A only for the first message exchange during the runtime service activity. Thereafter, it can issue a SAML
token to Service A that gets stored within the current session. Service A then uses this session-based
token with subsequent message exchanges. Because SAML tokens have a very small validity period (in
contrast to X.509 certificates), there is no need to perform a revocation check with every message
exchange.
C. WS-SecurityPolicy transport binding assertions can be used to improve performance via
transport-layer security The use of symmetric keys can keep the encryption and decryption overhead to a
minimum, which will further reduce the latency between Service A and Service B. By encrypting the
messages, attackers cannot modify message contents, so no additional actions for integrity verification
are needed.
D. The Data Origin Authentication pattern can be applied together with the Service Perimeter Guard
pattern to establish a perimeter service that can verify incoming request messages sent to Service B and
to filter response messages sent to Service A. The repository containing the verification information about
the Certificate Authorities can be replicated in the trust domain of the perimeter service. When access is
requested by Service A, the perimeter service evaluates submitted security credentials by checking them
against the locally replicated repository. Furthermore, it can encrypt messages sent to Service A by
Service B. and attach a signed hash value.
Answer: A

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NO.2 Service Consumer A sends a request message to Service A (1) after which Service A retrieves financial
data from Database A (2). Service A then sends a request message with the retrieved data to Service B
(3). Service B exchanges messages with Service C (4) and Service D (5), which perform a series of
calculations on the data and return the results to Service A. Service A uses these results to update
Database A (7) and finally sends a response message to Service Consumer A (8). Component B has
direct, independent access to Database A and is fully trusted by Database A. Both Component B and
Database A reside within Organization A. Service Consumer A and Services A, B, C, and D are external to
the organizational boundary of Organization A.
Component B is considered a mission critical program that requires guaranteed access to and fast
response from Database A. Service A was recently the victim of a denial of service attack, which resulted
in Database A becoming unavailable for extended periods of time (which further compromised
Component B). Additionally, Services B, C, and D have repeatedly been victims of malicious intermediary
attacks, which have further destabilized the performance of Service A.
How can this architecture be improved to prevent these attacks?
A. A utility service is created to encapsulate Database A and to assume responsibility for authenticating all
access to the database by Service A and any other service consumers. Due to the mission critical
requirements of Component B, the utility service further contains logic that strictly limits the amount of
concurrent requests made to Database A from outside the organizational boundary. The Data
Confidentiality and Data Origin Authentication patterns are applied to all message exchanged within the
external service composition in order to establish message-layer security.
B. Service Consumer A generates a private/public key pair and sends this public key and identity
information to Service A. Service A generates its own private/public key pair and sends it back to Service
Consumer A. Service Consumer A uses the public key of Service A to encrypt a randomly generated
session key and then sign the encrypted session key with the private key. The encrypted, signed session
key is sent to Service A. Now, this session key can be used for secure message-layer communication
between Service Consumer A and Service A. The Service Perimeter Guard pattern is applied to establish
a perimeter service that encapsulates Database A in order to authenticate all external access requests.
C. Services B, C, and D randomly generate Session Key K, and use this key to encrypt request and
response messages with symmetric encryption. Session Key K is further encrypted itself asymmetrically.
When each service acts as a service consumer by invoking another service, it decrypts the encrypted
Session Key K and the invoked service uses the key to decrypt the encrypted response. Database A is
replicated so that only the replicated version of the database can be accessed by Service A and other
external service consumers.
D. The Direct Authentication pattern is applied so that when Service Consumer A submits security
credentials, Service A will be able to evaluate the credentials in order to authenticate the request
message. If the request message is permitted, Service A invokes the other services and accesses
Database A. Database A is replicated so that only the replicated version of the database can be accessed
by Service A and other external service consumers.
Answer: A

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