DOL Technical Expertise 3

Question 1

A DevOps Leader notices that infrastructure drift is causing inconsistencies between environments. Which tool category directly addresses this problem?

Accepted Answer

Infrastructure as Code (IaC) tools

Answer

IaC tools like Terraform and Pulumi enforce desired state declaratively, preventing and detecting configuration drift across environments.

Question 2

What does the 'immutable infrastructure' principle mean in a DevOps context?

Accepted Answer

Servers are never modified in place; instead, new instances replace old ones

Answer

Immutable infrastructure replaces rather than updates running servers, ensuring consistency and eliminating configuration drift.

Question 3

Which observability pillar provides the most direct insight into the root cause of a distributed system failure?

Accepted Answer

Distributed traces

Answer

Distributed tracing follows a request across multiple services, making it the most effective tool for pinpointing which service or component caused a failure.

Question 4

A team wants to validate that Terraform changes won't break production before applying them. Which Terraform command should be part of their CI pipeline?

Accepted Answer

terraform plan

Answer

`terraform plan` generates an execution plan showing what changes will be made without applying them, enabling review and validation in CI.

Question 5

What is the main advantage of using a multi-stage Docker build?

Accepted Answer

Smaller final image size by excluding build-time dependencies

Answer

Multi-stage builds separate build environments from runtime environments, so compilers and build tools are not included in the final production image.

(DOL) DevOps Leader Practice Test

(DOL) DevOps Leader Practice Test

DOL Technical Expertise 3