Unit 4: Core concepts of Continuous Delivery (CD), Deployment & Automation - Practice Quiz

1 What is the main difference between Continuous Delivery and Continuous Deployment?

2 Which of the following is a key goal of Continuous Delivery?

3 Which Jenkins plugin is commonly used to define pipelines as code?

4 What is the primary purpose of Jenkins plugins?

5 In a Blue-Green deployment, what do the two environments represent?

6 What best describes a Canary deployment?

7 How does a Rolling deployment update an application?

8 Which deployment strategy allows near-instant rollback by simply switching traffic back to the old environment?

9 Which tool is primarily used as an Infrastructure as Code (IaC) provisioning tool?

10 Which configuration management tool is known for being agentless and using SSH?

11 What file format does Ansible primarily use to write playbooks?

12 What language does Terraform use to define infrastructure configurations?

13 Which command is used to preview the changes Terraform will make before applying them?

14 In Ansible, what is a group of hosts defined in an inventory file called?

15 What is the main benefit of containerization?

16 How do containers differ from traditional virtual machines?

17 Which component is the background service that manages Docker objects like images and containers?

18 What is Docker Hub primarily used for?

19 Which Dockerfile instruction specifies the base image to build upon?

20 Which command is used to build a Docker image from a Dockerfile?

21 A team has an automated pipeline that builds, tests, and stages every commit, but a human must click Approve before code reaches production. Which practice does this describe?

22 Which statement best distinguishes Continuous Deployment from Continuous Delivery?

23 In Jenkins, which plugin lets you define an entire delivery workflow as code using a Jenkinsfile?

24 A DevOps engineer wants Jenkins to visualize the flow of a change through build, test, and deploy stages as connected boxes. Which plugin is most appropriate?

25 A company keeps two identical production environments and switches all traffic from the old one to the new one at once after validation. Which strategy is this?

26 A team releases a new version to only 5% of users first, monitors error rates, then gradually increases the percentage. Which strategy is used?

27 In a rolling deployment across 10 instances, what is the main advantage compared to a big-bang release?

28 Which deployment strategy provides the fastest rollback because the previous version remains fully running in a separate environment?

29 Which characteristic best describes Ansible's default operating model?

30 Puppet typically follows which architecture for applying configuration?

31 Which tool is primarily designed for provisioning infrastructure declaratively and maintains a state file to track resources?

32 In Terraform, which command shows the actions Terraform will take without actually applying them?

33 An Ansible file that lists the target hosts and groups the automation will run against is called the:

34 Why is Ansible said to be idempotent when running a playbook multiple times?

35 Which statement correctly contrasts containers with virtual machines?

36 In Docker's architecture, which component is the persistent background service that builds, runs, and manages containers?

37 When you run docker pull nginx, where does Docker fetch the image from by default?

38 In a Dockerfile, what is the key difference between the CMD and ENTRYPOINT instructions?

39 To reduce cache invalidation and speed up rebuilds when only source code changes, where should COPY package.json and dependency installation be placed in a Dockerfile?

40 What does the -t flag do in the command docker build -t myapp:1.0 .?

41 A team practices Continuous Delivery but insists on a manual approval gate before the production release. Which statement correctly distinguishes their practice from Continuous Deployment?

42 An organization has a mature CI pipeline but frequent production incidents traced to configuration drift between staging and production. Which CD principle most directly addresses this?

43 In a Jenkins declarative pipeline, you need to pause execution for a manual production approval that times out and aborts after one hour. Which construct achieves this?

44 A team wants Jenkins pipeline definitions versioned alongside application source and automatically discovered per branch. Which plugin combination best supports this?

45 A service must maintain full capacity during deployment, requires instant rollback, but the team can afford double the infrastructure temporarily. Which strategy fits best?

46 During a canary release, 5% of traffic goes to the new version. Error rate on the canary is versus on the stable version. What is the correct automated response?

47 A rolling update with maxSurge=1 and maxUnavailable=0 is applied to a 4-replica deployment. What is the maximum number of pods that can exist simultaneously during the update?

48 Which statement correctly contrasts Terraform's and Ansible's operational models?

49 Puppet is described as enforcing 'idempotent' and 'eventual consistency' behavior. Which scenario best illustrates this?

50 A Terraform configuration hardcodes a resource that was later created manually in the cloud console. Running terraform apply tries to create a duplicate. What is the correct remediation?

51 In an Ansible playbook, a task must run only once on a single host even when targeting many hosts. Which directive achieves this?

52 Two engineers run terraform apply concurrently against the same remote backend without locking configured. What is the primary risk?

53 Which statement most accurately explains why containers are more lightweight than traditional virtual machines?

54 A stateless microservice scaled to 50 containers loses all in-memory session data when any container restarts. What architectural principle explains the correct handling?

55 When you run docker run nginx, which component is ultimately responsible for creating and running the container process?

56 A developer notices that changing one line in application code invalidates the Docker build cache for all subsequent layers, causing slow rebuilds. What is the root cause?

57 Consider a Dockerfile ending with ENTRYPOINT ["python"] and CMD ["app.py"]. What happens when you run docker run myimg script.py?

58 Which Dockerfile technique most effectively reduces final image size for a compiled Go application?

59 During docker build, you want to inject a secret token needed only at build time without it persisting in any image layer. What is the recommended approach?

60 Two images built from identical Dockerfiles on different machines produce different image digests despite no source changes. What is the most likely cause?