An interviewer asks: "Can you explain what blue-green deployment is?"
Which answer best demonstrates clear technical communication?
Option B is the strongest answer because it: ① Defines the concept clearly ("two identical production environments"); ② Explains the mechanism (deploy to idle env, verify, switch traffic via load balancer); ③ Covers the key benefit (instant rollback if something breaks). In DevOps interviews, complete explanations beat one-liners. Key vocabulary to include: load balancer, traffic switch, rollback, zero-downtime deployment. Compare with canary release: instead of switching 100% of traffic at once, canary gradually shifts a percentage (e.g. 5% → 20% → 100%), allowing early detection of issues at scale.
2 / 10
You're asked: "What is Infrastructure as Code (IaC) and why is it valuable?"
Which response best covers both the definition and the business value?
Option B delivers: ① Definition (describe infrastructure in config files, committed to version control); ② Named tools (Terraform, CloudFormation); ③ Three concrete business values (reproducible, versionable, reviewable). Strong DevOps communicators always pair a definition with why it matters. Key IaC vocabulary: declarative (you describe desired state, the tool figures out how) vs. imperative (you script each step); idempotent (applying the same config twice has the same result); configuration drift (when real infrastructure diverges from what was intended). Tools to know: Terraform (cloud-agnostic), CloudFormation (AWS), Pulumi (code-first IaC), Ansible (configuration management).
3 / 10
In a DevOps interview, the word "toil" has a specific meaning. Which sentence uses it correctly?
Toil is a term from Google's SRE (Site Reliability Engineering) book: manual, repetitive, automatable work that scales linearly with service growth and provides no lasting value. Examples: manually restarting a service, manually updating a config file, manually running a script that could be triggered automatically. The goal of SRE is to keep toil below 50% of an engineer's time. Eliminating toil = automation + better tooling. Essential SRE vocabulary: toil · SLI (Service Level Indicator) · SLO (Service Level Objective) · SLA (Service Level Agreement) · error budget · blameless post-mortem · incident response · runbook.
4 / 10
You're asked: "How do you approach reducing deployment risk?"
Which answer is most structured and complete?
Option C is the strongest answer — it lists five concrete, named strategies with clear reasoning, demonstrating real operational experience. Key vocabulary packed into a great answer: feature flag (toggle features without deploying), blast radius (limiting how many users are affected if something goes wrong), canary release (gradual traffic shift), blue-green deployment, CI pipeline, rollback plan. Option D mentions a tool but doesn't show understanding of the strategy. Option A is true but shallow. Never deploy on Fridays is a classic SRE principle (Option B is wrong) — lower traffic means less validation before the weekend.
5 / 10
Complete this DevOps statement with the correct term: "Our CI pipeline runs on every pull request: it builds the Docker image, runs the test suite, performs a static analysis scan, and then a _____ is required before the PR can be merged to main."
A passing status check (also called a required check or branch protection rule in GitHub) blocks a merge until the CI pipeline passes. CI/CD vocabulary for interviews: CI (Continuous Integration) — automatically build and test on every commit; CD (Continuous Delivery) — automatically deploy to staging; CD (Continuous Deployment) — automatically deploy to production. Pipeline stages: lint → test → build → scan → deploy. Key tools: Jenkins, GitHub Actions, GitLab CI, CircleCI, ArgoCD (GitOps). The phrase "shift left" means moving testing and security checks earlier in the pipeline (closer to development), not later before release.
6 / 10
Context: Sarah, a junior DevOps engineer, is responding to a Slack message from Mark, the senior architect, regarding a recent production outage. Mark writes: 'We're seeing high latency on the API endpoint /users. Can you investigate and identify any bottlenecks?'
Which of the following responses best demonstrates Sarah's understanding of the situation and appropriate next steps?
The correct answer focuses on practical investigation using performance monitoring tools (ping is too simplistic). Options A and D suggest immediate but potentially misguided actions. Option B demonstrates a lack of understanding about API performance analysis; the best approach is to examine recent deployments and configuration changes first – this is a common root cause in production issues.
7 / 10
Context: David, a DevOps engineer, is writing the description for a Pull Request he's submitting to merge code changes into the main branch. The change introduces a new feature that requires updating the Terraform configuration.
Which of the following PR descriptions best communicates the changes and their impact?
The best answer provides specific details about the changes made (the new module) and how they relate to infrastructure as code (Terraform). It also includes a reference to an associated issue number for context. Options A and B are too vague; option D is simply insufficient. A good PR description should clearly articulate *what* changed and *why*.
8 / 10
Context: During a standup meeting, Emily, a DevOps engineer, is updating the team on her progress.
Her manager asks: 'Emily, what's blocking you from completing the deployment?'
Which of the following responses best reflects a clear and concise update?
The correct answer acknowledges a specific problem (CI pipeline failures) and indicates that action has been taken (escalation). It provides context without being overly detailed. Options A and D are evasive or unhelpful; option B is too vague about the nature of the failure.
9 / 10
Context: Alex, a DevOps engineer, is reviewing a code change submitted by Ben. The change involves updating an API endpoint to handle a new data format.
Ben's commit message reads: 'Fixed the JSON parsing.'
Which of the following responses best provides constructive feedback to Ben?
The correct answer prompts Ben to provide more detail about the implementation and raises important questions about error handling – a critical aspect of API design. Option A is overly positive; option D is unprofessional. Option B demonstrates a proactive approach to code review.
10 / 10
Context: Liam, a DevOps engineer, is explaining the concept of canary deployments to a new team member, Chloe.
Liam says: 'We're using a canary deployment to roll out the new feature. It means we deploy the code to a small subset of users first.'
Which of the following best describes what Liam meant?
The correct answer accurately describes the core principle of a canary deployment: deploying to a small subset of users (servers or instances) for initial monitoring. Options A and D are incorrect representations. Option B correctly captures the controlled, monitored rollout approach.
What does "DevOps Interview Questions — IT English Practice" cover?
Practice answering DevOps interview questions in clear technical English. Blue-green deployment, IaC, toil, deployment risk reduction, CI/CD pipelines. 5 exercises with model answers.
How many questions are in this interview set?
This set has 10 exercises — 3 model-answer questions (choose the strongest way to answer a real interview question) and 2 vocabulary-in-context questions (choose the correct term for the situation), each with a full explanation.
Is this exercise free to use?
Yes. Every exercise on CoderSlingo, including this one, is free to use with no account, sign-up, or paywall.
Do these exercises include model answers?
Yes. Each interview question gives you several possible responses and asks you to pick the one that communicates most clearly and completely — the explanation then breaks down exactly why that answer works, including the specific vocabulary a strong candidate would use.
What if I choose an answer that isn't the strongest one?
You'll see which option was correct and read a full explanation of why it's stronger than the alternatives, plus the key vocabulary and phrasing worth reusing in a real interview.
Can I retry the questions?
Yes — use the "Try again" button on the results screen to reset and go through the set again.
Is this the same as a real technical or behavioural interview?
No — it's focused practice for the language side of interviewing: recognising which phrasing sounds precise and confident versus vague, and knowing the vocabulary interviewers expect for this role. It won't replace mock interviews, but it builds the vocabulary you'll need in one.
Where can I find interview prep for other roles?
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Who writes these interview questions?
Every question is written by the CoderSlingo team based on real technical interview patterns for this role, then reviewed for accuracy and clarity.