Architecting on AWS Certification Non-Destructive Testing Methods 3

Question 1

When designing an AWS FIS experiment, which component defines the conditions under which the experiment automatically stops to prevent unintended damage?

Accepted Answer

Stop condition using a CloudWatch alarm

Answer

FIS stop conditions monitor a CloudWatch alarm and automatically halt the experiment if a safety threshold is breached, keeping the test non-destructive.

Question 2

A resilience team wants to test how an application responds to an AZ failure without terminating instances. Which FIS action achieves this with minimal blast radius?

Accepted Answer

aws:ec2:stop-instances with a resource tag filter scoped to one AZ

Answer

Stopping (not terminating) instances scoped by tag to a single AZ simulates AZ loss while keeping instances recoverable and limiting blast radius.

Question 3

Which AWS tool allows you to test Auto Scaling policies by simulating metric changes without generating actual load on your fleet?

Accepted Answer

CloudWatch put-metric-data to publish custom metric values that trigger scaling policies

Answer

Publishing custom CloudWatch metric values with put-metric-data lets you drive Auto Scaling policy evaluations without real load, enabling safe policy validation.

Question 4

A chaos experiment on RDS needs to test multi-AZ failover. What is the non-destructive way to trigger a failover without data loss?

Accepted Answer

Reboot the primary DB instance with 'Failover' option checked

Answer

Rebooting with failover performs a synchronous multi-AZ switchover with no data loss and the primary automatically becomes available after the test.

Question 5

Which pattern ensures that a chaos experiment's impact is limited only to resources under test and cannot cascade to unrelated services?

Accepted Answer

Scope FIS resource targets using resource tags and set concurrency limits

Answer

Resource tags combined with FIS concurrency limits (e.g., percentage-based targeting) ensure the experiment touches only the intended resources.

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Non-Destructive Testing Methods 3