AWS DevOps High Availability 5

Question 1

A DevOps team uses AWS CodeDeploy with an Auto Scaling group. During a deployment, CodeDeploy fails on 3 out of 10 instances. What is the default behavior?

Accepted Answer

CodeDeploy stops the deployment and rolls back all instances based on the configured failure threshold

Answer

CodeDeploy evaluates the failure threshold and if exceeded, triggers an automatic rollback by redeploying the previous revision to all affected instances.

Question 2

Which S3 feature helps maintain availability of objects during multi-part upload failures or incomplete uploads that consume storage?

Accepted Answer

S3 Lifecycle policy to abort incomplete multipart uploads after a specified number of days

Answer

A lifecycle rule targeting incomplete multipart uploads automatically cleans them up after a configured number of days, freeing storage and reducing confusion.

Question 3

A high-availability architecture requires Aurora MySQL instead of standard RDS MySQL. What is a key availability advantage Aurora provides?

Accepted Answer

Aurora automatically replicates storage across 3 AZs with 6 copies of data and supports up to 15 read replicas with sub-10ms failover

Answer

Aurora's distributed storage layer maintains 6 copies across 3 AZs and its failover to a read replica typically completes in under 30 seconds, often under 10 seconds.

Question 4

In an AWS Step Functions state machine used for deployment orchestration, which feature helps handle transient failures in downstream service calls?

Accepted Answer

Built-in retry and catch configurations on task states with exponential backoff

Answer

Step Functions allows defining Retry policies with maxAttempts and backoffRate directly on task states, handling transient errors without custom retry logic.

Question 5

An engineering team needs to test their application's resiliency to EC2 instance failures. Which AWS service enables controlled fault injection experiments?

Accepted Answer

AWS Fault Injection Simulator (FIS) with EC2 instance stop/terminate actions

Answer

AWS FIS provides controlled chaos engineering experiments including EC2 instance termination, CPU stress, network disruption, and other fault injections with safety guardrails.

AWS Practice Test

AWS Practice Test

AWS DevOps High Availability 5