DevOps DevOps 3

Question 1

What is the purpose of a 'blue-green deployment'?

Accepted Answer

Maintaining two identical environments to switch traffic with zero downtime

Answer

Color-coding logs by severity

Answer

Running blue tests before green tests

Answer

Separating frontend and backend teams

Question 2

In Docker, what is the difference between an image and a container?

Accepted Answer

An image is a static template; a container is a running instance of it

Answer

An image runs while a container is stored on disk

Answer

They are identical terms

Answer

A container builds images automatically

Question 3

Which metric is part of the DORA 'Four Key Metrics' for DevOps performance?

Accepted Answer

Deployment frequency

Answer

Number of open browser tabs

Answer

Lines of code per commit

Answer

Total Slack messages sent

Question 4

What does 'observability' primarily rely on?

Accepted Answer

Logs, metrics, and traces

Answer

Only CPU usage graphs

Answer

Manual code reviews

Answer

User satisfaction surveys

Question 5

In a pipeline, what is a 'gate' or 'approval step' used for?

Accepted Answer

Requiring a condition or human sign-off before promoting to the next stage

Answer

Increasing build speed automatically

Answer

Caching dependencies

Answer

Deleting old artifacts

Question 6

What problem does a 'service mesh' (e.g., Istio) primarily solve?

Accepted Answer

Managing service-to-service communication, security, and observability

Answer

Compiling source code faster

Answer

Storing container images

Answer

Provisioning bare-metal servers

Question 7

Why is 'secrets management' (e.g., HashiCorp Vault) important in DevOps?

Accepted Answer

To securely store and rotate credentials instead of hardcoding them

Answer

To speed up the CI pipeline

Answer

To compress build artifacts

Answer

To document API endpoints