Validates knowledge of designing DevOps solutions, including source control, build and release pipelines, security and compliance, and instrumentation.
AZ-400 runs 100 minutes (120 if it includes labs), and Microsoft says most of its exams have 40 to 60 questions. Several answers often work and you pick the one Microsoft recommends, with a case study and, for some candidates, a lab. We compared the main options on official coverage, case-study practice and price.
Most people should start with Microsoft's free practice assessment. Add MeasureUp for the closest official questions and Tutorials Dojo as a cheap second bank. No practice test simulates the lab, so use Microsoft's free labs too.
| Practice test | Best for | Questions | Price |
|---|---|---|---|
 AZ-400 Designing and Implementing Microsoft DevOps Solutions Practice Test | Closest official questions | 139 | $99 |
 AZ-400 Microsoft Azure DevOps Engineer Expert Practice Exams | Cheap second bank | 140+ | $15 |
 AZ-400 DevOps Engineer Expert Practice Exams | Case-study practice | 309 | $199/year |
Official questions with a rationale and a documentation link for every answer in your score report. It shows the exam's question style, but not its length, case studies or labs.
Great fit if you want a free read on the exam's style and your weak areas before spending anything.
Poor fit if you need volume or a timed full-length run; use MeasureUp.
Microsoft's official practice-test partner. Timed certification mode and customisable practice mode, with explanations for right and wrong options and score reports by skill area. Content was last updated in August 2024.
Great fit if you want the closest official question wording and detailed explanations, and can pay for 30 or 60 days of access.
Poor fit if you want long-term access for one price; Tutorials Dojo gives a year for $15.
Timed, review, section-based and randomised modes with explanations and reference links, including dropdown, drag-and-drop and hotspot items. The review mode gets praise, but the question pool is small.
Great fit if you want a low-cost bank with good explanations to use after the free assessment or alongside MeasureUp.
Poor fit if you want volume; candidates see repeats quickly, so pair it with MeasureUp.
A bank built by Microsoft MVP Aleksi Partanen, with an explanation and further-reading link for each question. Timed full-length exams and case studies are on the paid plan; free sample questions let you try it first.
Great fit if you want case-study practice, or will also sit other Microsoft exams on the same plan.
Poor fit if AZ-400 is your only exam; at $199 a year it costs far more than Tutorials Dojo.
Microsoft Learn: AZ-400 study guide ↗Microsoft Learn: exam duration and experience ↗GitHub: Microsoft AZ-400 labs ↗Reddit: failed AZ-400 after perfect MeasureUp ↗Reddit: Tutorials Dojo and the free assessment ↗
Yes. Microsoft Learn offers a free AZ-400 practice assessment with unlimited retakes, and you need to sign in to your Learn profile. CertiAce also has free sample questions, and Microsoft's exam sandbox lets you try the question types.
Candidates usually call Microsoft's free assessment easier than the exam. MeasureUp is the closest, but some people have scored very high on it and still failed, so use it alongside hands-on practice.
Microsoft says some role-based exams include labs and does not publish which ones. Candidates report both cases; practise with Microsoft's free AZ-400 labs, because no practice-test product simulates the lab.
There is no official number. Most passers in Reddit threads combined the free assessment with one paid bank, then reviewed every miss against Microsoft Learn.