C90.06 Practice Questions

Question 1

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?

Accepted Answer

The Service State Management pattern can be applied to establish a system that can persist 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.

Answer

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.

Answer

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.

Answer

None of the above.

Question 2

Cloud Service A requires access to Cloud Storage Device A and Cloud Storage Device B. Cloud Service A is hosted by Virtual Server A. Virtual Server A and Virtual Server B are hosted by Hypervisor A, which resides on Physical Server A.

Cloud Service Consumer A sends a request to access Cloud Service A (1). Cloud Service A retrieves data from Cloud Storage Device A and Cloud Storage Device B (2). Cloud Consumer A uses the usage and administration portal to access resource usage reports for Cloud Service A (3).

Cloud Service Consumer A and Cloud Consumer A belong to Organization A, which is leasing an laaS environment from the cloud provider.

The cloud provider makes Cloud Service A available to several new cloud service consumers.

Additionally, new LUNs are created on Cloud Storage Devices A and B for new cloud consumers to perform regular data access functions. This increase in workload causes Virtual Server A to fail during peak usage periods. Organization A and the new cloud consumer organizations request that the cloud provider find a way to dynamically support the higher usage workloads.

Organization A keeps its master files and data in LUN B in Cloud Storage Device B. One day, a cloud resource administrator accidentally changes the path used to access LUN B. The original path cannot be retrieved. The cloud resource administrator informs Organization A's IT department that it must change any systems or tools it uses to access LUN B to the new path.

This causes significant challenges, as well as a costly period of disruption. Organization A asks the cloud provider to create a system that would help avoid disruption in access to LUN B, if this was to ever happen again.

The cloud provider has made Cloud Storage Device A part of a resource pool of synchronized cloud storage devices. Organization A is sharing Cloud Storage Device A with another cloud consumer organization. When cloud consumers from both organizations access Cloud Storage Device A at the same time, they encounter a resource constraint condition that causes Cloud Storage Device A to fail. Organization A requests that the cloud provider extend the existing cloud architecture to prevent this situation from happening again.

Which of the following statements provides a solution that can address all of these problems?

Accepted Answer

The Elastic Resource Capacity pattern can be applied to establish a system that can dynamically allocate resources to Virtual Server A. The Multipath Resource Access pattern can be applied to establish a multipathing system that can provide an alternative path to LUN B in Cloud Storage Device B. The Resource Reservation pattern can be applied to establish a system that enables Organization A to have exclusive access to pre-defined resources on Cloud Storage Device A for a given period of time.

Answer

The Elastic Network Capacity pattern can be applied to implement a system that dynamically assigns network ports to Virtual Server A before its processing capacity thresholds are reached.
The Redundant Physical Connection for Virtual Servers pattern can be applied to create an alternative path to LUN B in Cloud Storage Device B. The Resource Pooling pattern can be applied to synchronize Cloud Storage Device A with other cloud storage devices.

Answer

The Resource Reservation pattern can be applied to dynamically provision resources to Virtual Server A whenever its processing thresholds are being reached. The Persistent Virtual Network Configuration pattern can be applied to establish a persistent hyperlink to LUN B over the virtual network that cannot be lost. The Elastic Resource Capacity pattern can be applied to prevent Cloud Storage Device A from encountering resource constraints.

Answer

None of the above.

Question 3

Physical Server A hosts Hypervisor A which hosts Virtual Server A, Virtual Server B and an active cluster comprised of three virtual servers. Virtual Server A hosts Ready-Made Environment A. Ready-Made Environment A uses Cloud Storage Device A to store data related to the ready-made environment and its users. Cloud Service A is hosted by a high-availability (HA) virtual server cluster. Hypervisor A is a cluster-enabled hypervisor.

Developers access Ready-Made Environment A to work on the development of a new solution (1).

During this usage. Ready-Made Environment A regularly reads and writes data to Cloud Storage Device A (2). Cloud Service Consumer B accesses Cloud Service A (3). Cloud Service A queries data residing in Cloud Storage Device A in response to processing requests from Cloud Service Consumer B (4).

Hypervisor A is made part of a cluster of hypetvisors. Ready-Made Environment A, which is still hosted by Virtual Server Aon Hypervisor A, subsequently becomes unexpectedly unavailable. It then takes twenty minutes to pass before Virtual Server A and Ready-Made Environment A become available again on Hypervisor B (a hypervisor that is also part of the hypervisor cluster). This delay is considered unacceptable by Cloud Consumer A. Furthermore, after being relocated

to Hypervisor B, Virtual Server A is unable to connect to the network. By the time the cloud provider rectifies this second problem, Cloud Consumer A experiences a total of two hours of downtime.

Which of the following statements describes a solution that can minimize or entirely avoid a delay for the runtime relocation of Ready-Made Environment A?

Accepted Answer

The Non-Disruptive Service Relocation pattern can be applied to place a secondary copy of Ready-Made Environment A on Hypervisor B. The Persistent Virtual Network Configuration pattern can be applied so that virtual servers retain network configurations when moving to other hypervisors.

Answer

The Load Balanced Virtual Server Instances pattern can be applied in combination with the Elastic Network Capacity pattern in order to establish a system whereby Ready-Made Environment A can be smoothly transitioned between hypervisors in the same cluster, while its underlying virtual server maintains the network connection.

Answer

The Hypervisor Clustering pattern was incorrectly applied and therefore needs to be re-applied correctly in order to establish a native system capable of instantly relocating virtual servers between hypervisors within the same cluster. The Direct I/O Access pattern can then also be applied so that the virtual servers retain their network configurations regardless of which hypervisor within the cluster they reside on.

Answer

The Load Balanced Virtual Server Instances and Persistent Virtual Network Configuration patterns can be applied together to ensure that the virtual servers retain their network configurations when moving to another hypervisor. The Redundant Storage pattern can further be applied to move the ready-made environment to another hypervisor without service impact.

Question 4

Virtual Server A and Virtual Server B are hosted by Hypervisor A, which resides on Physical Server A. Virtual Server A hosts Cloud Service A. Virtual Server C. Virtual Server D, Virtual Server E and Virtual Server F are hosted by Hypervisor B on Physical Server B. Physical Server C, which hosts Hypervisor C, is currently not being used.

Cloud Service Consumer A accesses Cloud Service A (1), which accesses files stored in a folder on Virtual Server A (2). Cloud Consumer B uses Proprietary User Portal A to administer legacy software (not shown) installed on Virtual Server D (3). Proprietary User Portal B and Proprietary User Portal C are also available for accessing additional legacy systems located on Virtual Server F; however, they are not often used.

The cloud shown in the figure is a private cloud. Department A and Department B share IT resources within the private cloud and are part of the same organization. Cloud Service Consumer A belongs to Department A and Cloud Consumer B belongs to Department B.

During routine access of Cloud Service A by Cloud Service Consumer A, the Department A cloud resource administrator is notified that a hardware fault is occurring within Physical Server A that will soon cause it to fail. The cloud resource administrator scrambles to arrange for Cloud Service A to be relocated but is unable to do so before Physical Server A does fail. It takes several more hours of downtime until, with the cooperation of the cloud provider, the Cloud Service A implementation is successfully moved to Physical Server C and made live again. Managers at Department A demand that a system be put in place to avoid this scenario in the future.

Cloud Service A was initially developed specifically for Department A's Cloud Service Consumer A. However, recently Department B has indicated that it will be developing its own cloud service consumer that will also need to regularly access Cloud Service A. After this new cloud service consumer is deployed, both Department A and Department B experience occasional runtime errors when their cloud service consumers attempt to access Cloud Service A at the same time.

Cloud Service A accesses a legacy system on Virtual Server A that requires regular updates and patches to stay current. Each time the legacy system is updated, Cloud Service A needs to undergo an update as well, during which it needs to be temporarily unavailable. Department A managers ask the cloud provider to extend the cloud architecture so that a duplicate, secondary implementation of Cloud Service A can be made available while the primary implementation undergoes a maintenance update.

Which of the following statements provide a solution that can adequately resolve all of Departments A and B's issues?

Accepted Answer

The Non-Disruptive Service Relocation pattern can be applied to establish a system that uses live VM migration to move the virtual server hosting Cloud Service A to a new physical server without allowing any downtime. The Dynamic Scalability pattern can be applied to establish a system whereby multiple instances of Cloud Service A can be created and an automated scaling listener can be used to redirect concurrent requests to the Cloud Service A instances. The Non-Disruptive Service Relocation pattern can be applied to establish a system whereby cloud service consumer requests to Cloud Service A can be temporarily redirected to a duplicate implementation of Cloud Service A while the original implementation undergoes a maintenance outage.

Answer

The Resource Reservation pattern can be applied to protect the Cloud Service A implementation via the use of a logical network perimeter. The Workload Distribution pattern can be applied to introduce a load balancing system for Cloud Service A. The Zero Downtime pattern can be applied to establish a system that allows Cloud Service A to be constantly available, even during maintenance outages.

Answer

The Resource Pooling pattern can be applied to pool together Physical Server A, B and C, thereby enabling the Cloud Service A implementation to be migrated to a different physical server when its hosting physical server fails. The Dynamic Scalability pattern can be applied to establish a system whereby multiple instances of Cloud Service A can be created and an automated scaling listener can be used to redirect concurrent requests to the Cloud Service A instances. The Load Balanced Virtual Server Instances pattern can be applied to establish a system that distributes instances of Cloud Service A to Virtual Server B.

Answer

None of the above.

Question 5

Cloud Service A and Cloud Service B perform different functions but both share access to Cloud Storage Device A when fulfilling requests from cloud service consumers that require data access.

Cloud Services A and B are hosted by Virtual Server A, which is hosted by Hypervisor A on Physical Server A.

Cloud Service Consumer A accesses Cloud Service A to issue a request for data (1). Cloud Service A queries a database in Cloud Storage Device A to retrieve the data (2). Upon receiving the requested data, Cloud Service Consumer A combines it with additional data to form a new collection of data. Cloud Service Consumer A then accesses Cloud Service B and provides it with the new data (3). Cloud Service B accesses a different database in Cloud Storage Device A to store the new data (4). Cloud Consumer B accesses the usage and administration portal to upload new data (5). The data is uploaded to Cloud Storage Device B (6).

Cloud Service Consumer A belongs to Organization A. Cloud Consumer B belongs to Organization B.

Cloud Service A is a SaaS product offered by the cloud provider to the general public, and is therefore used by numerous cloud consumers from different organizations at different times. Cloud Service B is also a SaaS product as part of the same overall solution as Cloud Service A.

However, because a given cloud service consumer only needs to access Cloud Service B when the data it receives from Cloud Service A meets certain criteria, it is not used nearly as much as Cloud Service A. Cloud Service A currently has a hard threshold allowing no more than 10 concurrent instances of it to exist at once. One day, Cloud Service Consumer A attempts to access Cloud Service A as the eleventh cloud service consumer, and is predictably rejected.

Cloud Service Consumer A belongs to Organization A, one of the cloud provider's most important customers. Therefore, when Organization A complains about not being able to access Cloud Service A during peak usage times, the cloud provider agrees to provide a solution.

As a result of a natural disaster, the cloud provider's data center that houses Physical Server A becomes unexpectedly unavailable. Physical Server A subsequently becomes unavailable for nearly two days. This outage exceeds what the cloud provider guaranteed in its original SLA and the cloud provider agrees to not charge Organization for usage fees for an entire month as compensation. However, the unavailability of Physical Server A had a significant impact on Organization As business, resulting in financial loss and loss of confidence of its clients.

Organization A informs the cloud provider that it cannot continue working with this cloud unless the cloud provider can guarantee that the availability of Physical Server A will no longer be dependent on a single data center or a single geographic region.

Organization B receives its latest monthly invoice from the cloud provider and discovers that the charges are identical to the invoice it received last month, even though the usage and administration portal shows that its data usage is a third less. They bring this issue to the attention of the cloud provider and are informed that they are currently subscribed to a fixed-allocation plan.

The cloud provider explains that in order to get them on a plan whereby they are charged only for actual data usage, Cloud Storage Device B would need to be upgraded and a system capable of tracking runtime usage would need to be established. Organization B asks the cloud provider to make these changes.

Which of the following statements provides a solution that can address Organization A's and Organization B's issues?

Answer Options

AThe Resource Pooling pattern can be applied to pool the IT resources used by Cloud Service A so that requests from Cloud Service Consumer A can utilize these resources during peak usage times. The Non-Disruptive Service Relocation pattern can be applied so that, in the event of failure, Cloud Storage Device B can be migrated at runtime to a cloud in another geographic region. The Elastic Disk Provisioning pattern can be applied so that Organization B is only charged for the amount of data storage it uses.

BThe Service Load Balancing pattern can be applied to balance the workloads across multiple Cloud Service A implementations. The Synchronized Operating State pattern can be applied so that Virtual Server A is automatically synchronized to a secondary implementation of Physical Server A located in a different geographic region. The Usage Monitoring pattern can be applied so Cloud Consumer B's resource consumption is tracked and logged at runtime.

CThe Service Load Balancing pattern can be applied to create redundant service implementations of Cloud Service A, so that a load-balancing system can distribute workloads across the service implementations dynamically. The Zero Downtime pattern can be applied to establish a secondary deployment of Physical Server A in a different data center located in a different geographic region. The Elastic Disk Provisioning pattern is applied together with the Payas-You-Go pattern to establish systems that ensure that Cloud Consumer B is charged only for the amount of data and resources it consumes.

DNone of the above.

Correct Answer: C

Accepted Answer

The Service Load Balancing pattern can be applied to create redundant service implementations of Cloud Service A, so that a load-balancing system can distribute workloads across the service implementations dynamically. The Zero Downtime pattern can be applied to establish a secondary deployment of Physical Server A in a different data center located in a different geographic region. The Elastic Disk Provisioning pattern is applied together with the Payas-You-Go pattern to establish systems that ensure that Cloud Consumer B is charged only for the amount of data and resources it consumes.

Answer

The Resource Pooling pattern can be applied to pool the IT resources used by Cloud Service A so that requests from Cloud Service Consumer A can utilize these resources during peak usage times. The Non-Disruptive Service Relocation pattern can be applied so that, in the event of failure, Cloud Storage Device B can be migrated at runtime to a cloud in another geographic region. The Elastic Disk Provisioning pattern can be applied so that Organization B is only charged for the amount of data storage it uses.

Answer

The Service Load Balancing pattern can be applied to balance the workloads across multiple Cloud Service A implementations. The Synchronized Operating State pattern can be applied so that Virtual Server A is automatically synchronized to a secondary implementation of Physical Server A located in a different geographic region. The Usage Monitoring pattern can be applied so Cloud Consumer B's resource consumption is tracked and logged at runtime.

Answer

None of the above.

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