AZ-400 Continuous Delivery 5

Question 1

Which approach best supports immutable infrastructure in a continuous delivery pipeline for Azure VMs?

Accepted Answer

Build a new VM image with Packer and swap it via a scale set rolling update

Answer

Building new images with Packer and updating scale sets treats infrastructure as immutable — never mutating running machines.

Question 2

A pipeline artifact is published in one stage and consumed in a later deployment stage. Which YAML keyword downloads the artifact in the consuming stage?

Accepted Answer

- download:

Answer

The 'download' step in a YAML pipeline retrieves artifacts published earlier in the same or an upstream pipeline.

Question 3

Your pipeline must deploy to 50 VMs defined in an Azure DevOps environment. Which deployment strategy minimizes risk by updating only 10 VMs at a time?

Accepted Answer

Rolling with maxParallel: 10

Answer

Setting maxParallel to 10 in a rolling strategy updates exactly 10 VM targets concurrently per iteration, limiting blast radius.

Question 4

A team wants to automatically roll back a deployment if the error rate exceeds 5% within 10 minutes of release. Which combination of Azure services achieves this?

Accepted Answer

Application Insights + Azure Monitor release gate with auto-rollback script

Answer

Application Insights detects error rate spikes; a post-deployment gate queries the metric and can trigger a rollback pipeline on threshold breach.

Question 5

Which Azure Pipelines variable scope is evaluated at queue time and can be set by the person triggering the pipeline run?

Accepted Answer

Runtime (queue-time) variable

Answer

Queue-time variables are defined with 'isReadonly: false' and can be overridden by the user when manually triggering a run.

AZ-400 Practice Test

AZ-400 Practice Test

AZ-400 Continuous Delivery 5