C90-03A 全真模擬試験 DEMO

問題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.
正解: A