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시험 번호/코드: C90-06A
시험 이름: SOA Certified Professional (Cloud Architecture Lab)
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Q&A: 15 문항
업데이트: 2014-03-23
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NO.1 Cloud Sen/ice A is hosted by Virtual Server A, which is hosted by Hypervisor A on Physical
Server
A. Cloud Service B is hosted by Virtual Server B.
Virtual Server C hosts Cloud Services C and D.
Virtual Server B and Virtual Server C are hosted by Hypervisor B on Physical Server B.
Cloud Service Consumer A accesses Cloud Service A (1). Cloud Service Consumer B accesses Cloud
Service A (2). Cloud Service Consumer C accesses Cloud Service A (3) and then accesses Cloud
Service B (4).
Cloud Service Consumers A, B and C simultaneously access Cloud Service A.
Cloud Service Consumer C receives a runtime exception and its request for access is rejected. It is
determined that Cloud Service Consumer C attempted to upload a large amount of input data for
Cloud Service A, which exceeded the bandwidth threshold of the virtual network. The cloud
architecture needs to be improved to avoid this from happening again.
Cloud Service Consumer C's repeated access of Cloud Service B imposes workloads that are large
and highly unpredictable. After some time, Cloud Service B begins to delay its responses and
sometimes times out entirely. The cloud resource administrator discovers that Virtual Server B is
unstable and close to failure primarily because its CPU and memory resources are being used to
their maximum capacity.
Cloud Services C and D are being positioned as SaaS products for use by a range of cloud consumer
organizations. After their initial release, they begin to quickly use up the available memory in Virtual
Server C, primarily because of the large amounts of state and session data they need to place into
memory for extended periods.
Which of the following statements lists the patterns that can be applied to solve these three
requirements and problems?
A. Elastic Network Capacity, Load Balanced Virtual Server Instances, Service State Management
B. Elastic Resource Capacity, Service Load Balancing, Synchronized Operating State
C. Persistent Virtual Network Configuration. Load Balanced Virtual Switches, Service State
Management
D. None of the above.
Answer: A
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NO.2 Cloud Service A is hosted by Virtual Server A, which is hosted by Hypervisor A that resides on
Physical Server A.
Cloud Storage Device A is used to store media library data that is continuously replicated with a
redundant, secondary implementation of Cloud Storage A (not shown). Access to Cloud Service A is
monitored by Pay-Per-Use Monitor A.
Access to Cloud Storage Device A is monitored by Pay-Per-Use Monitor B.
Pay-Per-Use Monitors A and B capture billing-related usage data that is forwarded to a billing
management system that is hosted by Physical Server B.
Cloud Service Consumer A accesses Cloud Service A and the usage data is captured by Pay-Per-Use
Monitor A (1). Cloud Consumer B accesses Cloud Storage Device A via a usage and administration
portal that it uses to upload media data (2). This usage is captured by Pay-Per-Use Monitor B (3).
Pay-Per-Use Monitors A and B store collected usage data in the billing management system (4),
which is later used by the cloud provider to bill for the usage of Cloud Service A and Cloud Storage
Device A.
Each service instance of Cloud Service A requires a virtual server with 2 virtual CPUs and 4 GBs of
RAM at a package price of $2.00 for each initial invocation and an additional $0.50 for each
consecutive 60 seconds of usage. Cloud Service Consumer A accesses Cloud Service A twice in one
day. The two exchanges with Cloud Service A last 60 seconds and 120 seconds. For that one day, the
organization that owns Cloud Service Consumer A is billed $6.50, which it determines is incorrect.
After complaining to the cloud provider, it is discovered that the rapid provisioning system
responsible for provisioning instances of Cloud Service A is not de-provisioning Cloud Service A
when Cloud Service Consumer A indicates it has completed an exchange. Instead, Cloud Service A is
de-provisioned after a 60 second timeout that occurs after Cloud Service Consumer A is completed
with an exchange.
Storage space on Cloud Storage Device A can only be purchased in units of terabytes (TBs), with
each TB costing $1 per day. Cloud Consumer B purchases 5 TBs of storage space on day 1 and stores
5 TBs of data on days 6 and 7. Cloud Consumer B was expecting to be billed $10.00, but is billed $35.
After raising a complaint, Cloud Consumer B is informed by the cloud provider that cloud consumers
are billed based on the allocation of storage space, regardless of how much storage space they
actually use.
Which of the following statements describes a solution that can update the cloud architecture to
avoid these billing-related problems and discrepancies?
A. The Pay-as-You-Go pattern can be applied together with the Usage Monitoring pattern to
establish a monitoring and billing system capable of de-provisioning Cloud Service A instances when
they are no longer required. The Dynamic Data Normalization pattern can be applied to eliminate
any redundant data stored by Cloud Consumer A so that the amount of required storage space is
minimized.
B. The Platform Provisioning pattern can be applied to create an intelligent automation script
capable of immediately de-provisioning cloud service instances. The Redundant Storage pattern can
be applied to introduce a secondary cloud storage device for which storage space can be billed
based on actual usage.
C. The Self-Provisioning pattern can be applied to enable the organization that owns Cloud Service
Consumer B to configure how and to what extent Cloud Service A instances need to be provisioned.
The Resource Management pattern can be applied to establish a storage system that bills cloud
consumers for actual storage space usage only.
D. None of the above.
Answer: D
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NO.3 Cloud Storage Device A contains LUN A and can be accessed by external cloud consumers via a
proprietary user portal that is used primarily by cloud consumers to upload and manage data for
backup purposes. Pay-Per-Use Monitor A tracks the amount of data being uploaded and forwards
this information to a billing management system. Cloud Storage Device B is a secondary cloud
storage device. Data from Cloud Storage Device A is replicated synchronously to Cloud Storage
Device B using a storage replication program (not shown). Cloud Storage Device A is further
administered by a cloud resource administrator that works for the cloud provider, who accesses the
cloud storage device via an internal usage and administration portal.
Three different cloud consumers (Sarah. William, Matilda) access Cloud Storage Device A to upload
data for backup purposes (1). These three cloud consumers belong to different
departments within the same organization, and therefore all three share LUN A.
Pay-Per-Use Monitor A collects the storage space data and forwards it to the billing management
system (2).
The cloud provider offers premium and discount storage plans. With the premium plan, the data
stored on Cloud Storage Device A is also replicated to Cloud Storage Device B.
With the discount plan, the data stored on Cloud Storage Device A is not replicated. Both plans are
based on fixed-disk storage allocation. The cost of the premium plan is $5 per week for every GB of
storage space and the cost of the discount plan is $2 per week for every GB of storage space. The
SLA from the cloud provider guarantees availability of 97% for access to Cloud Storage Device A.
The three cloud consumers use Cloud Storage Device A as follows:
-Sara signs up for the discount backup plan and is allocated 50 GBs of storage space. A week later,
she uploads 10 GBs of backup data. A week after that, she uploads another 35 GBs. She later finds
out that for those two weeks her organization was billed $200, which is more than she was
expecting. After she complains to the cloud provider, she learns about how fixed-disk storage
allocation is billed. She asks the cloud provider to change her account to a different
storage plan where she is only billed for the actual amount of storage space she uses at any
given time. The cloud provider assures her that a new system will be set up to accommodate
this request.
-William is on the premium backup plan. He uploads 1 to 3 GBs of important business data every
day. After two weeks of daily uploads, he realizes that the centralized nature of the backup data on
the cloud makes it more convenient for reporting purposes than the distributed nature of the same
data in his on-premise environment. He uses an analysis tool to run queries against the cloud-based
data. However, due to the large quantity of redundant data, the queries end up being ineffective
and take too long to run. He asks the cloud provider to find a solution that can streamline the
cloud-based data by reducing redundancy. By reducing the overall quantity of the data, the analysis
queries will run faster.
-Matilda is on the discount backup plan and uploads backup data on a daily basis. Over the course
of two weeks she uploads over 200 GBs of data. She performs a daily backup at the end of each day
by identifying the data to back up and then using the proprietary user portal to run the cloud
backup procedure. This procedure can take 5 to 45 minutes, depending on the amount of data she
is uploading. Matilda performs this as her last task of the day and therefore initiates the procedure
before she leaves, but does not wait for it to complete. One day, she receives an e-mail from the
cloud provider explaining that the backup procedure from the previous day had failed due to an
unexpected hardware failure that occurred on Cloud Storage Device A.
The notification e-mail goes on to state that this type of failure falls within the 97% availability
guarantee of her organization's SLA, and is therefore in compliance with the current provisioning
agreement. Had a disaster occurred that night, the on-premise data could have been lost and
Matilda would be held accountable. Matilda contacts the cloud provider to demand that the
provisioning agreement be amended to upgrade their existing SLA to the maximum possible
availability (which, for this cloud provider, is 99.999%). The cloud provider agrees to establish a
system to accommodate this request.
Which of the following statements lists the patterns that can be applied to address the three issues
raised by the three cloud consumers?
A. Storage Workload Management, Elastic Disk Provisioning, Centralized Remote Administration
B. Elastic Disk Provisioning, Dynamic Data Normalization, Zero Downtime
C. Storage Maintenance Window, Dynamic Failure Detection and Recovery, Broad Access
D. None of the above.
Answer: B
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NO.4 Ready-Made Environment A is hosted by Virtual Server A and Ready-Made Environments is
hosted by Virtual Server B.
Virtual Servers A and B are hosted by Hypervisor A, which is part of a hypervisor cluster. An
automated scaling listener intercepts cloud consumer requests and automatically invokes the
on-demand generation of additional instances of ready-made environments, as required.
A self-service portal and a usage and administration portal are also available to cloud consumers.
The self-service portal can be used to request the provisioning of a new ready-made environment.
Any cloud consumer that has already had a ready-made environment provisioned can configure and
view information about that ready-made environment via the usage and administration portal.
Cloud Consumer A accesses Ready-Made Environment A to work on the development of a new
cloud service (1). Cloud Consumer B accesses Ready-Made Environment B to test a recently
completed application comprised of three cloud services (2). Cloud Consumer C accesses the
self-service portal to request the creation of a new ready-made environment (3).
The cloud provider is required to perform an emergency maintenance outage on a cloud storage
device used by all ready-made environments. The unplanned outage takes two hours. During this
period, Cloud Consumers A and B are unable to access Ready-Made Environments A and B and
Cloud Consumer C receives an error when submitting a request to create a new ready-made
environment.
After the maintenance outage is over, Cloud Consumers A and B encounter the following problems:
-Cloud Consumer A is unable to recover session data that was kept in memory for an extended
period, prior to the time of the outage. -Cloud Consumer B has no access to Virtual Server B, which
was moved to Hypervisor B during
the maintenance outage. When Cloud Consumer B attempts to ping Virtual Server B, the
request times out.
Even though Cloud Consumer C is able to log into the usage and administration portal to confirm
that its ready-made environment was successfully provisioned, the unexpected outage has raised
concerns about the stability of the ready-made environment's underlying infrastructure. Cloud
Consumer C informs the cloud provider that it cannot proceed with its lease of the ready-made
environment if there are future occurrences of this type of maintenance outage.
Which of the following statements can help address the problems and concerns of the three cloud
consumers?
A. A combination of the Load Balanced Virtual Server Instances and Synchronized Operating State
patterns can be applied to establish a system capable of deferring state across multiple cloud
storage devices, each located on a different virtual server. The Elastic Disk Provisioning pattern can
be applied to persist virtual server configuration data across hypervisors so that connectivity is
preserved whenever a virtual server is relocated to a different hypervisor. The Zero Downtime
pattern can be applied to ensure that none of the ready-made environments or virtual servers are
subject to a maintenance outage in the future.
B. The Elastic Disk Provisioning and Cross-Storage Device Vertical Tiering patterns can be applied to
establish a cloud architecture that supports a set of cloud storage devices, each with different tiers
that cloud consumers can choose to scale to The Synchronized Operating State pattern can be
applied in combination with the Hypervisor Clustering pattern to avoid further virtual server and
ready-made environment connectivity problems. The Redundant Storage pattern can be applied so
that if a cloud storage device fails, a secondary implementation of the cloud storage device
automatically takes over processing tasks, thereby avoiding outages.
C. The Service State Management pattern can be appliedto establish a system that canpersist
session data in a database. The Persistent Virtual Network Configuration pattern can be applied to
centralize the configuration data necessary for virtual servers to remain accessible after they have
been relocated to different hypervisors. The Storage Maintenance Window pattern can be applied
to establish a system that allows cloud storage devices to be maintained without causing outages.
D. None of the above.
Answer: C
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NO.5 Cloud Service A requires access to Cloud Storage Device A, which contains LUNs A and B.
Cloud Service A is hosted by Virtual Server A, which resides on Hypervisor A on Physical Server A.
Virtual Server B hosts Cloud Service B and Cloud Service C.
Cloud Service Consumer A accesses Cloud Service A (1), which then accesses LUN A or B on Cloud
Storage Device A (2). After receiving the requested data from Cloud Service A, Cloud Service
Consumer A forwards the data to Cloud Service B (3), which then writes it to Cloud Storage Device B
(4).
Cloud Service Consumer A belongs to Organization A.
Organization A uses LUN A and LUN B on Cloud Storage Device A to store their important client
account data. Cloud Storage Device A is a low-performance cloud storage device, which begins to
cause performance issues as more data is added to LUNs A and B and as Cloud Service Consumer A
performs data access requests more frequently. Organization A asks that its cloud architecture be
upgraded to process increased quantities of data and higher volumes of data requests.
Organization A has been leasing a PaaS environment that it used to build Cloud Service A, which it
would like to make available to the general public. Organization A needs to establish a system
capable of monitoring usage of Cloud Service A for billing purposes.
The cloud provider is using a usage data collection and reporting system that gathers information on
Organization A's hosted IT resources approximately ten hours after the time of usage. One day,
Organization A attempts to retrieve information on whether Virtual Server B has available Cloud
Service C instances. They discover that they are unable to obtain the current status of Virtual Server
B.
Organization A demands a system that provides instant availability reporting.
Which of the following statements lists the patterns that can be applied to solve these three
requirements and problems?
Which of the following statements lists the patterns that can be applied to solve these three
requirements and problems?
A. Cross-Storage Device Vertical Tiering, Pay-as-You-Go. Self-Provisioning
B. Service Load Balancing, Pay-as-You-Go, Multipath Resource Access
C. Intra-Storage Device Vertical Data Tiering, Usage Monitoring, Centralized Remote Administration
D. None of the above.
Answer: D
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