AWS Certified SysOps Administrator SOA-C01 – Question460

A user has configured ELB with Auto Scaling. The user temporarily suspended the Auto Scaling terminate process. What might the Availability Zone Rebalancing process (AZRebalance) conse-quently cause during this period?

A. Auto Scaling will keep launching instances in all AZs until the maximum instance number is reached.
B. AZ Rebalancing might now allow Auto Scaling to launch or terminate any instances.
C. AZ Rebalancing might allow the number instances in an Availability Zone to remain higher than the maximum size
D. It is not possible to suspend the terminate process while keeping the launch active.

Correct Answer: C

Explanation:

Explanation: Auto Scaling performs various processes, such as Launch, Terminate, and Availability Zone Re-balance (AZRebalance). The AZRebalance process type seeks to maintain a balanced number of in-stances across Availability Zones within a region. If the user suspends the Terminate process, the AZRebalance process can cause the Auto Scaling group to grow up to ten percent larger than the maximum size. This is because Auto Scaling allows groups to temporarily grow larger than the max-imum size during rebalancing activities. If Auto Scaling cannot terminate instances, the Auto Scal-ing group could remain up to ten percent larger than the maximum size until the user resumes the Terminate process type. Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/US_Sus…