C90.03 試験問題を無料オンラインアクセス

Organization A has been expanding and, as a result, is outgrowing the processing capacity
of its on-premise Service A implementation. It is determined that this is due to usage
thresholds of Service A and complex data processing limitations in Database A.
The diagram depicts Organization A's current on-premise environment, where Service
Consumers A.
B and C attempt to access Service A at the same time. Service Consumer A
successfully accesses Service A, which then successfully retrieves the requested data (1).
Service Consumer B successfully accesses Service A, but due to the complex data
structure, the request for the data times out and fails (2). Finally, Service Consumer C
attempts to access Service A, but is rejected because Service A is unable to accept more
concurrent requests.

Organization A is required to continue using its on-premise Service A implementation, with
the exception of Database A, which does not need to remain on-premise. Database A is
dedicated to Service A and is comprised of relational data. Which of the following
statements provides a solution that uses cloud-based IT resources to solve the
performance limitations of Service A and Database A?

• A.A failover system can be implemented in a hybrid architecture comprised of
  Organization A's existing on-premise environment and a public cloud environment. The
  failover system would span both environments so that when Service A is unable to process
  request messages from Service Consumers A, B or C, the failover system can
  automatically route messages to a redundant implementation of Service A residing in the
  public cloud. Similarly, when Database A is unable to process a data access request from
  Service A.the failover system can automatically route this request to a redundant
  implementation of Database A, also residing in the public cloud.
• B.The state management database and resource replication mechanisms can be
  implemented to establish redundant implementations of Service A and Database A in both
  on-premise and cloud environments. Using resource replication, a cloud-based duplicate of
  Service A (Cloud Service A) will be established in a public cloud and will remain in synch
  with Service A via regular replication cycles. Using the resource replication mechanism
  together with the state management database mechanism allows for Database A to be
  dynamically replicated in an independent state management database that has redundant
  implementations in both on-premise and cloud environments. The state management
  database can be further optimized to support non-relational data to improve data access
  performance.
• C.A cloud bursting solution can be implemented, whereby a redundant copy of Service A
  is implemented within a public cloud. This cloud-based, redundant implementation of
  Service A is referred to as Cloud Service A.
  A copy of Database A is also implemented within the cloud and both the on-premise and cloud-based copies of Database A are
  redesigned to be non-relational in order to improve data access performance. Service A
  continues to act as a first point of contact for Service Consumers A, B and C.
  An automated scaling listener is deployed so that when Service A's thresholds are met,
  requests are automatically routed to Cloud Service A.
• D.None of the above

Cloud Provider Y owns Cloud Y, which provides a set of cloud services, virtual servers and
one physical server. Cloud Services A and B are hosted on Virtual Server A, which is
hosted by Physical Server A.
Physical Server A also hosts Virtual Server B, which hosts
redundant implementations of Cloud Services A and B for load balancing purposes. Cloud
Service Consumer A is accessing Cloud Service A located on Virtual Server A.
Cloud Service Consumer B is accessing Cloud Service B located on Virtual Server B.
Cloud Service Consumers A and B are both owned by Cloud Consumer X.
Cloud Consumer X has recently complained that Cloud Services A and B have become
less available than what is guaranteed in their service level agreements (SLAs). Cloud
Provider Y launches an investigation that reveals that Virtual Servers A and B have been
subjected to denial of service attacks. This is confirmed as the cause of the decline in the
availability of Cloud Services A and B.

Which of the following statements describes a solution that can increase the availability of
Cloud Services A and B?

• A.Cloud Provider Y can implement the identity and access management mechanism to
  mitigate denial of service attacks and can further implement the failover system mechanism
  (by introducing a redundant physical server with redundant virtual servers) so that when an
  attack is successful on a given virtual server, a redundant virtual server can take its place.
• B.Cloud Provider Y can introduce a single sign-on mechanism for Virtual Server A to
  mitigate denial of service threats. The automated scaling listener can then be implemented
  on Virtual Server B in order to limit the number of instances of Cloud Services A and B.
  This will prevent Virtual Server B from overloading due to denial of service attacks.
• C.Cloud Provider Y can move Cloud Service B to Virtual Server A, thereby positioning
  Virtual Server B as a redundant fallback server used when Virtual Server A is successfully
  attacked. Similarly, Cloud Provider Yean move Cloud Service A to Virtual Server B, so that
  Virtual Server A acts as a redundant fallback server for when Virtual Server B is
  successfully attacked.
• D.Cloud Provider Y can implement a cloud bursting system, whereby Cloud Service A on
  Virtual Server B automatically takes the place of Cloud Service A on Virtual Server A when
  that service fails. Similarly, Cloud Service B on Virtual Server A can then automatically take
  the place of Cloud Service B on Virtual Server A when that service fails.

Cloud Service Consumer A accesses Cloud Service A (1) that resides in Cloud X.
a private cloud owned by the same organization acting as Cloud Consumer A.
Cloud Service A
processes the message from Cloud Service Consumer A and then sends back a response
with the requested data (2). Next, Cloud Service Consumer A sends a message containing
some of this data to Cloud Service B (3), which resides in public Cloud Y that is owned by
Cloud Provider Y.
After processing the message. Cloud Service B sends back a response
with additional data to Cloud Service Consumer A (4). Finally, Cloud Service Consumer A
writes the data it collected from Cloud Services A and B to Database A (5).
Recently, Cloud Service Consumer A has been required to access Cloud Services A and B
at a significantly higher rate, sometimes over 1,000 times within a given workday. This
increased usage has not affected Cloud Service B' s performance. Cloud Service A,
however, has been generating runtime exceptions, and responses to Cloud Service
Consumer A have become increasingly slow and unreliable. It is determined that this
decline in performance is due to infrastructure limitations within private Cloud X' s
environment. Instead of investing in new infrastructure for Cloud X, it is decided to explore
the feasibility of moving Cloud Service A to Cloud Y instead.

Which of the following statements describe valid financial considerations that can be taken
into account for assessing the feasibility of this move?

• A.By moving Cloud Service A to Cloud Y, there may be a decrease in operational
  governance control over the Cloud Service A implementation. This can increase locked-in
  costs because Cloud Consumer A may be forced to form dependencies upon proprietary
  tools used to configure and maintain the Cloud Service A implementation.
• B.Because, in this scenario, the cost of capital is comprised of the up-front costs added to
  the on-going costs, the cost of capital required to move Cloud Service A to Cloud Y will be
  higher than upgrading Cloud X to accommodate Cloud Service A' s increased usage.
• C.If the existing infrastructure that currently resides in private Cloud X was purchased
  specifically in support of Cloud Service A, then there may be a financial loss resulting from
  moving Cloud Service A out of Cloud X.
  This can be considered sunk costs that need to be
  evaluated.
• D.Moving Cloud Service A to Cloud Y will result in the need for Cloud Service A to
  undergo integration testing to determine how well it can function within Cloud Y and what
  changes may need to be made to Cloud Service A in order for it to behave as expected.
  The integration testing and the subsequent changes required for Cloud Service A to
  function correctly within Cloud Y will incur integration costs that need to be budgeted for.