Which of the following statements are true regarding the cooldown period?

A commercial bank has a forex trading application. They created an Auto Scaling group of EC2 instances that allow the bank to cope with the current traffic and achieve cost-efficiency. They want the Auto Scaling group to behave in such a way that it will follow a predefined set of parameters before it scales down the number of EC2 instances, which protects the system from unintended slowdown or unavailability.

Which of the following statements are true regarding the cooldown period? (Select TWO.)
A . Its default value is 300 seconds.
B . It ensures that the Auto Scaling group launches or terminates additional EC2 instances without any downtime.
C . Its default value is 600 seconds.
D . It ensures that before the Auto Scaling group scales out, the EC2 instances have ample time to cooldown.
E . It ensures that the Auto Scaling group does not launch or terminate additional EC2 instances before
the previous scaling activity takes effect.

View Answer

Answer: A,E

Explanation:

In Auto Scaling, the following statements are correct regarding the cooldown period:

It ensures that the Auto Scaling group does not launch or terminate additional EC2 instances before the

previous scaling activity takes effect.

Its default value is 300 seconds.

It is a configurable setting for your Auto Scaling group.

The following options are incorrect:

– It ensures that before the Auto Scaling group scales out, the EC2 instances have ample time to

cooldown.

– It ensures that the Auto Scaling group launches or terminates additional EC2 instances without any downtime.

– Its default value is 600 seconds.

These statements are inaccurate and don’t depict what the word "cooldown" actually means for Auto Scaling. The cooldown period is a configurable setting for your Auto Scaling group that helps to ensure that it doesn’t launch or terminate additional instances before the previous scaling activity takes effect. After the Auto Scaling group dynamically scales using a simple scaling policy, it waits for the cooldown period to complete before resuming scaling activities. The figure below demonstrates the scaling cooldown:

Explanation:

Reference:

http://docs.aws.amazon.com/autoscaling/latest/userguide/as-instance-termination.html

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