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 describe how a cloud balancing solution can
be implemented to fulfill the resiliency requirements of Cloud Service A?

• A. Cloud Service A is redundantly deployed in advance within Clouds X.
  Y and Z and is further supplemented with failover system mechanisms and specialized types of automated
  scaling listener mechanisms.
• B. Clouds X, Y and Z are equipped with failover system mechanisms and specialized types
  of automated scaling listener mechanisms in order to establish cross-cloud resiliency.
  Cloud Service A is configured so that Clouds X, Y and Z can dynamically generate
  redundant instances on-demand.
• C. Using a PaaS environment, the cloud service owner can configure a primary Cloud
  Service A implementation on Cloud X so that when failure conditions occur, message
  requests from cloud service consumers are automatically routed to a redundant on-premise
  implementation of Cloud Service A.
  This requires the implementation of the failover system and resource replication mechanisms.
• D. A type of automated scaling listener that can also be considered a cloud monitor is
  implemented in Clouds X, Y and Z to establish a system whereby each cloud can assume
  control of cloud service consumer message exchanges. This results in resilient cloud
  balancing, as opposed to on-demand cloud balancing.

A cloud consumer is interested in leasing cloud-based virtual servers. It compares the
virtual servers offered by Cloud Provider X and Cloud Provider Y.
Cloud X (owned by Cloud Provider X) and Cloud Y (owned by Cloud Provider Y) both provide shared physical
servers that host multiple virtual servers for other cloud consumers.
The virtual servers on Cloud X are accessed directly, whereas the virtual servers on Cloud
Y are accessed via an automated scaling listener. On Cloud X, virtual servers are pre-
configured to support a specific amount of concurrent cloud service consumers. When this
threshold is exceeded, cloud service consumer requests are rejected. Due to the use of the
automated scaling listener, virtual servers on Cloud Y can provide a greater level of
elasticity.

The hourly cost to the cloud consumer to use a virtual server on Cloud X is half that of the
cost to use a virtual server on Cloud Y.
Within a one month period, Cloud Provider X bases its hourly charge on the maximum number of virtual servers used. Within a one month
period, Cloud Provider Y bases its hourly charges on actual virtual server usage. Cloud
Provider Y charges $20 for each hour that a cloud consumer uses a virtual server.
The cloud consumer predicts its monthly usage requirements to be as follows:

The cloud consumer is required to choose the cloud provider with the lowest on-going cost,
based on its predicted usage. Which of the following statements accurately calculates the
on-going usage costs of Cloud Providers X and Y and correctly states the cloud provider
that the cloud consumer must choose?

• A. The total usage duration is (20 + 30 + 50) hours = 100 hours.
  The actual usage is (20 + 30 + 50) X 5 server hours = 500 server hours.
  The cost of using virtual servers from Cloud Provider X is (500 X 5 X$10) = $25,000.
  The cost of using virtual servers from Cloud Provider Y is (500 X $20) = $10,600.
  The cloud consumer must therefore choose Cloud Provider Y.
• B. The total usage duration is (20 + 30 + 50) hours = 100 hours.
  The actual usage is (20X3)+ (30X4) + (50X5) hours =430 hours.
  The cost of using virtual servers from Cloud Provider Xis100X5X$10 = $5,000.
  The cost of using virtual servers from Cloud Provider Y is 430 X $20 = $8,600.
  The cloud consumer must therefore choose Cloud Provider X.
• C. The total usage duration is (20 + 30 + 50) x 12 hours = 1,200 hours.
  The actual usage is (20 X 3) + (30 X4) + (50 X 5) server hours = 430 server hours.
  The cost of using virtual servers from Cloud ProviderXis12X5X$10 = $600.
  The cost of using virtual servers from Cloud Provider Y is 430 X $20 = $8,600.
  The cloud consumer must therefore choose Cloud Provider X.
• D. The total usage duration is (3 x 20) + (4 x 30) + (5 x 50) hours = 430 hours.
  The actual usage is (20 + 30 + 50) hours = 100 hours.
  The cost of using virtual servers from Cloud Provider X is (430 X $10) = $4,300.
  The cost of using virtual servers from Cloud Provider Y is (100 X $20) = $2,000.
  The cloud consumer must therefore choose Cloud Provider Y.