AZ-400 Study Guide: Pass the DevOps Expert Exam

The AZ-400 is the exam behind the Microsoft Certified: DevOps Engineer Expert credential. It runs 120 minutes, you need a scaled score of 700 to pass, and it carries a hard prerequisite: you already hold either the Azure Administrator Associate or the Azure Developer Associate certification. This guide walks through what's actually tested, how heavy each section is, and a study plan that matches the way the questions are weighted. The exam was last updated April 24, 2026, so older prep material may be out of date.

What's on the AZ-400 exam

Microsoft splits the exam into five areas, with these official weightings:

Read that table twice. Build and release pipelines is more than half the exam. The other four domains split the remaining 45%, three of them at 12.5% each and instrumentation lower at 7.5%. If you only have a few weeks, your time allocation should look like that table, not an even split across five topics.

Processes and communications is about wiring up the work: Azure Boards, work item tracking, and how you structure team flow and traceability. Source control strategy covers Git at scale, branching models, repository structure, and handling large or sensitive files. The pipelines domain is the giant, and it's where YAML pipelines, agents, artifacts, deployment patterns, and release gates all live. Security and compliance is about secrets management, dependency and code scanning, and governance. Instrumentation is the smallest slice: telemetry, monitoring, and feedback loops with tools like Application Insights.

The format mixes several question styles, including multiple choice, build list, case studies, drag and drop, hot area, and hands-on labs. The labs matter. You're not just clicking radio buttons; you may be dropped into an environment and asked to configure something. That changes how you study, because recognizing the right answer is not the same as being able to do the task.

How hard is the AZ-400 and how long to prepare

This is an Expert-level exam, and the prerequisite tells you who it's for. You can't walk in cold. You need the Azure Administrator Associate or the Azure Developer Associate first, which means you already know your way around the Azure portal, identity, and either infrastructure or app development. AZ-400 assumes that baseline and tests how you connect those pieces into a working delivery pipeline.

If you already do this work day to day, with Azure DevOps or GitHub pipelines you've built yourself, four to six weeks of focused review is a reasonable target. If your DevOps experience is mostly on another platform, or you understand the concepts but haven't shipped pipelines in Azure, give yourself eight to ten weeks and spend a big chunk of it in a real environment.

The exam rewards judgment over recall. Many questions are scenarios where more than one answer technically works, and you have to pick the best fit given constraints like cost, security, or team size. The passing mark of 700 is a scaled score, not a raw percentage, so don't try to back-calculate how many questions you can miss. Aim to be genuinely solid, especially on pipelines.

One scheduling note: your seat time is longer than the exam clock. The 120 minutes is exam time, and the booked appointment runs about 140 minutes once labs are included. Plan for the full sitting.

A study plan that matches the weighting

This phased plan front-loads the heaviest domain. Compress or stretch it to fit your timeline.

Weeks 1 to 2: Pipelines first. Start with the official AZ-400 study guide on Microsoft Learn and the Azure DevOps and GitHub Actions documentation. Build a YAML pipeline from scratch that compiles code, runs tests, produces an artifact, and deploys to at least two environments with an approval gate between them. Half the exam lives here, so spend half your early time here.

Weeks 3 to 4: Source control and process. Set up a repo with a branching strategy, branch policies, and pull request rules. Connect commits to work items in Azure Boards so you can see end-to-end traceability. Practice handling large files and keeping secrets out of history. Learn when you'd pick trunk-based development versus a release-branch model and why.

Week 5: Security, compliance, and instrumentation. Add secret management with a vault, wire dependency and code scanning into your pipeline, and set up monitoring with Application Insights so a deployment produces real telemetry. These are smaller domains, but they tie the whole pipeline together and the scenarios test that connection.

Final week: Practice testing and gaps. Stop adding new material. Take timed, exam-style questions, review every miss until you understand why the right answer wins, and go back into the lab to redo anything you fumbled. Practice under time pressure so the labs don't surprise you on exam day.

Throughout, keep a running list of services and when you'd use each one. The exam tests trade-offs, so a flat list of features won't carry you.

What trips people up

Don't memorize feature lists. The questions are built to punish that. They hand you a scenario with constraints and ask for the best option, so you need to understand why you'd choose one tool over another, not just that both exist.

The pipelines domain is a trap precisely because it feels familiar, and familiar is not the same as exam-ready. The deeper questions cover multi-stage deployments, deployment strategies like blue-green and canary, self-hosted versus Microsoft-hosted agents, and how artifacts and variables flow across stages.

Don't skip the labs in your prep. If you only study by reading, the hands-on portions will cost you, so build pipelines in a real environment, break them, and work out how to fix them.

The security domain is easy to wave off at 12.5%, but secrets handling and supply-chain scanning show up in scenario questions woven into pipeline problems, so weakness there can cost you points in the big domain too.

Practice the right way

Reading docs gets you to understanding. Practicing exam-style questions gets you to passing. Once you've built real pipelines and worked through the official study guide, the fastest way to find your weak spots is to answer questions written in the exam's scenario style and review every one you miss.

That's what the AZ-400 practice set is for: realistic, exam-style questions that push you to choose the best option under constraints, not just recall a definition. You can also browse the full catalog of practice exams if you're planning a path through several Azure certifications. Work each question until you can explain why the right answer beats the plausible wrong ones, and your accuracy on the real exam will track that habit.

Is the AZ-400 worth it

DevOps demand has stayed strong. Job postings for DevOps engineers have grown by 18% annually since 2020 (softwareoasis.com), and around 70.6% of positions offer some remote flexibility in recent H2 2025 data (devopsprojectshq.com). Pay reflects the seniority the role usually requires. Coursera lists the typical US DevOps engineer at about $144,000 a year for 2026, while Indeed reports an average base of roughly $131,894 with a range from about $85,024 to $204,601. Treat those as cited reference points, not a guarantee; they vary widely by location and experience.

This is not an entry path, though. Industry data suggests around 60% of DevOps roles ask for senior-level experience and only about 5% target juniors (devopscube.com, 2024). AZ-400 fits people already on or near the DevOps track who want a credential that matches what they do.

FAQ

What score do I need to pass the AZ-400? A scaled score of 700. It's not a straight percentage, so don't calculate it as a fixed number of correct answers.

Do I need another certification before AZ-400? Yes. You must hold either the Azure Administrator Associate or the Azure Developer Associate certification first.

How long is the exam? Exam time is 120 minutes. The booked appointment runs about 140 minutes once the lab portions are included.

How much does the AZ-400 cost? Microsoft does not publish a single price; it states the cost varies by region and country. Check the official exam page for your local price.