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시험 번호/코드: C90-03A
시험 이름: SOA Certified Professional (Cloud Technology Lab)
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Q&A: 21 문항
업데이트: 2014-03-18

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NO.1 Cloud Service Consumer A invokes Cloud Service A from Cloud X (owned by Cloud Provider X) (1). To
fulfill the request from Cloud Service Consumer A, Cloud Service A needs to invoke Cloud Service B that
resides on Cloud Y (owned by Cloud Provider Y) (2). After completing its processing, Cloud Service B
sends a response to Cloud Service A (3). Cloud Service A verifies the response and then finally sends its
response to Cloud Service Consumer A (4).
The guaranteed availability of the Cloud Service A implementation is 95% and the guaranteed availability
of the Cloud Service B implementation is 95%. Which of the following statements accurately describes the
actual availability that Cloud Service Consumer A can receive based on the described scenario?
A. Because Cloud Service Consumer A's response message is processed by two separate cloud
services, the combined availability increases as follows:
1.- (1 - 0.95) X (1 - 0.95) = 0.9975 or 99.75%
B. Because Cloud Service A acts as both a cloud service and cloud service consumer in order to
process Cloud Service Consumer B's request message, Cloud Service A forms a dependency on
Cloud Service B. As a result, the combined availability decreases, as follows:
0.95 X 0.95 = 0.9025 or 90.25%
C. Cloud Service Consumer A benefits from redundant cloud service implementations, thereby
increasing the guaranteed availability as follows:
1.- (1 - (0.95 - 0.1))X (1 - (0.95 - 0.1)) = 0.9775 or 97.75%
D. As a result of the dependency formed by Cloud Service Aon Cloud Service B,the combined availability
decreases significantly as follows:
(0.95 X 0.95) - 0.1 = 0.8025 or 80.25%
Answer: B

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NO.2 The cloud service owner of Cloud Service A is evaluating Clouds X, Y and Z to determine which cloud
environment can offer the greatest level of reliability. All three clouds are geographically dispersed across
three separate time zones. As a result, each cloud experiences usage peaks at different times. Based on
the metrics provided, the greater the usage of a cloud, the lower its reliability. When the cloud service
owner complains to Cloud Provider A (the owner of all three clouds) that none of the clouds provide an
adequate level of reliability, Cloud Provider A suggests a solution that increases resiliency.
Which of the following statements accurately describes a solution that can be used to fulfill the resiliency
requirements of Cloud Service A.?
A. Redundant implementations of Cloud Service A are deployed in all three clouds. The failover system
mechanism and a special type of automated scaling listener mechanism are implemented to establish a
system whereby one redundant Cloud Service A implementation will automatically take over from another.
B. A cloud balancing solution is established, whereby an automated scaling listener mechanism is
implemented on each cloud in such a way that every cloud can automatically scale out to another cloud.
As a result, if reliability problems occur on any one cloud, the subsequent requests will be scaled out to
another cloud in a manner that is transparent to cloud service consumers.
C. A failover system mechanism is implemented on Cloud X, which acts as the primary point of contact for
cloud serviceconsumers. Upon failure conditions occurring, the Cloud Service A implementation on Cloud
X automatically hands over control of current and future message requests from cloud service consumers
to Cloud Y. Cloud Y retains control of cloud serviceconsumer communication until the next failure
condition occurs, at which point it hands over control to Cloud Z. Finally, if a failure condition occurs in
Cloud Z. control is handed back to Cloud X.
D. A cloud balancing solution is established, whereby a resource replication mechanism is implemented
on each cloud. This allows Cloud Service A to be automatically replicated across cloud environments,
thereby enabling each implementation of Cloud Service A to take the place of another, whenever failure
conditions occur.
Answer: A

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시험 번호/코드: C90-03A

시험 이름: SOA Certified Professional (Cloud Technology Lab)

시험 번호/코드: C90-02A

시험 이름: SOA Certified Professional (Cloud Technology Concepts)

시험 번호/코드: C90-01A

시험 이름: SOA Certified Professional (Fundamental Cloud Computing(C90.01))

시험 번호/코드: S90-20A

시험 이름: SOA Certified Professional (SOA Security Lab)

시험 번호/코드: S90-19A

시험 이름: SOA Certified Professional (Advanced SOA Security)

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NO.1 Which of the following can directly contribute to making a service composition architecture more
vulnerable to attacks?
A. Reliance on intermediaries
B. Reliance on transport-layer security
C. Reliance on open networks
D. All of the above
Answer: D

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NO.2 An alternative to using a ___________ is to use a __________.
A. Public key, private key
B. Digital signature, symmetric key
C. Public key, key agreement security session
D. Digital signature, asymmetric key
Answer: C

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NO.3 When designing XML schemas to avoid data-centric threats, which of the following are valid
considerations?
A. The maxOccurs attribute needs to be specified using a restrictive value.
B. The <xsd:any> element needs to be avoided.
C. The <xsd:restriction> element can be used to create more restrictive user-defined simple types.
D. All of the above.
Answer: B,D

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NO.4 The application of the Service Loose Coupling principle does not relate to the use of security policies
as part of service contracts.
A. True
B. False
Answer: B

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NO.5 How can the use of pre-compiled XPath expressions help avoid attacks?
A. Pre-compiled XPath expressions execute faster and therefore help avoid denial of service attacks.
B. Pre-compiled XPath expressions reduce the chance of missing escape characters, which helps avoid
XPath injection attacks
C. Pre-compiled XPath expressions contain no white space, which helps avoid buffer overrun attacks
D. They can't because XPath expressions cannot be pre-compiled
Answer: B

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NO.6 ___________ is an industry standard that describes mechanisms for issuing, validating, renewing and
cancelling security tokens.
A. WS-Security
B. WS-Trust
C. WS-SecureConversation
D. WS-SecurityPolicy
Answer: B

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NO.7 The Trusted Subsystem pattern is applied to a service that provides access to a database. Select the
answer that best explains why this service is still at risk of being subjected to an insufficient authorization
attack.
A. Attackers can steal confidential data by monitoring the network traffic that occurs between the service
and the database.
B. Because the Service Perimeter Guard pattern was also not applied, the database is not protected by a
firewall.
C. If an attacker gains access to the security credentials used by the service to access the database, the
attacker can access the database directly.
D. None of the above.
Answer: C

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NO.8 Security policies defined using WS-SecurityPolicy can be used to convey which of the following
requirements to a service consumer?
A. Whether transport-layer or message-layer security needs to be used
B. The encryption type that needs to be used for transport-layer security
C. The algorithms that need to be used for cryptographic operations
D. The type of security token that must be used
Answer: A,C,D

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NO.9 The use of session keys and symmetric cryptography results in:
A. Increased performance degradation
B. Increased reliability degradation
C. Reduced message sizes
D. None of the above
Answer: D

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NO.10 The Service Perimeter Guard pattern has been applied to help avoid denial of service attacks for a
service inventory. As a result, services within the service inventory are only accessible via a perimeter
service However, denial of service attacks continue to succeed and services within the service inventory
become unavailable to external service consumers. What is the likely cause of this?
A. The application of the Service Perimeter Guard pattern needs to be combined with the application of
the Message Screening pattern in order to mitigate denial of service attacks.
B. The perimeter service itself is the victim of denial of service attacks. As a result, none of the services
inside the service inventory can be accessed by external service consumers.
C. The Trusted Subsystem pattern should have been applied so that each service has a dedicated trusted
subsystem.
D. The Service Perimeter Guard pattern does not help avoid denial of service attacks.
Answer: B

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NO.11 Which of the following types of attack always affect the availability of a service?
A. Exception generation attack
B. SQL injection attack
C. XPath injection attack
D. None of the above
Answer: D

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NO.12 The use of XML schemas for data validation helps avoid several types of data-centric threats.
A. True
B. False
Answer: A

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NO.13 Service A needs to be designed so that it supports message integrity and so that only part of the
messages exchanged by the service are encrypted. You are asked to create the security policy for this
service. What type of policy assertions should you use?
A. Token assertions
B. Protection assertions
C. Security binding assertions
D. Service A's security requirements cannot be expressed in a policy
Answer: B

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NO.14 Service A has recently been the victim of XPath injection attacks. Messages sent between Service A
and Service C have traditionally been protected via transport-layer security. A redesign of the service
composition architecture introduces Service B, which is positioned as an intermediary service between
Service A and Service C. The Message Screening pattern was applied to the design of Service B. As part
of the new service composition architecture, transport-layer security is replaced with message-layer
security for all services, but Service A and Service C continue to share the same encryption key. After the
new service composition goes live, Service A continues to be subjected to XPath injection attacks. What
is the reason for this?
A. The message screening logic can only work for Service C. Therefore, Service A is not protected.
B. Because message-layer security is being used, it is not possible for the message screening logic in
Service B to inspect messages without having the encryption key that is shared by Service A and Service
C.
C. XPath injection attacks are not prevented by message screening logic or message-layer security.
D. None of the above.
Answer: B

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NO.15 Service A's logic has been implemented using managed code. An attacker sends an XML bomb to
Service A. As a result, Service A's memory consumption started increasing at an alarming rate and then
decreased back to normal. The service was not affected by this attack and quickly recovered. Which of
the following attacks were potentially avoided?
A. XML parser attack
B. Buffer overrun attack
C. Insufficient authorization attack
D. Denial of service
Answer: A,D

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