Update: Corrected the certification prerequisite and scaled-score explanation, checked the current domain weights, and clarified which preparation advice is not an exam guarantee.
AZ-305 (Designing Microsoft Azure Infrastructure Solutions) is the exam behind the Microsoft Certified: Azure Solutions Architect Expert credential. It sits above the associate tier and tests something genuinely different from the exams before it: not what a service does, but which service, pattern, and trade-off you should choose given a set of business and technical constraints. This guide covers the four design domains AZ-305 actually tests, the prerequisite Microsoft enforces at the certification level, how hard the exam really is, and a study approach that matches how the exam is structured.
What kind of exam AZ-305 is
AZ-305 is a design exam, not an operations exam. You will rarely be asked what a setting does; instead you are given a scenario - a company with existing infrastructure, a compliance requirement, a budget constraint, a recovery time objective - and asked to choose the architecture that satisfies all of it at once. Many questions have more than one technically valid answer, and the correct choice is the one that best fits the stated constraints. This is the biggest adjustment for people coming from associate-level exams: you are being tested on judgment and trade-offs, not recall.
The four AZ-305 design domains
Microsoft's skills outline effective April 17, 2026 groups AZ-305 into four design domains. Use the official guide linked below to check for changes before booking:
- Design identity, governance, and monitoring solutions (25-30%) - authentication, authorization, governance, and monitoring design.
- Design data storage solutions (20-25%) - relational and non-relational storage choices and data integration.
- Design business continuity solutions (15-20%) - backup, disaster recovery, and availability requirements.
- Design infrastructure solutions (close to a third, the single largest domain) - compute choices, networking topology, application architecture, and migration strategy.
The credential requires Azure Administrator Associate
Passing AZ-305 and earning the Expert credential are separate milestones. Microsoft's certification page lists Azure Administrator Associate (AZ-104) as the prerequisite certification; Azure Developer Associate is not an alternative. You can plan your exam order separately, but check your Learn profile and the current credential requirements rather than assuming an AZ-305 pass alone awards the title.
How hard is AZ-305, really
AZ-305 is a genuine step up from AZ-104, and the jump surprises people who assume it is just 'AZ-104 with harder questions.' It is not primarily harder because of unfamiliar services - most of the services appear in AZ-104 too - it is harder because you must hold several competing requirements in your head simultaneously and reason about which one wins. Long scenario stems, case-study-style questions, and answer options that are all technically feasible are the norm rather than the exception. People with strong AZ-104-level knowledge but no design experience often underestimate this exam on a first attempt.
How to prepare for AZ-305
A study plan for AZ-305 should look different from an associate-exam plan, because memorizing service facts will not carry you through design scenarios. A structure that works well:
- Start from a solid Azure administration foundation. If your hands-on experience is thin, close that gap alongside your design study.
- Study by domain, not by service. Work through identity and governance design, then data storage design, then business continuity, then infrastructure, building a mental checklist of trade-offs for each (cost vs performance, simplicity vs resilience, managed vs self-hosted).
- Read Azure Architecture Center reference architectures for common patterns - hub-and-spoke networking, landing zones, multi-region failover - since AZ-305 scenarios frequently mirror these patterns directly.
- Practice with scenario-heavy questions, not flashcards. The exam format rewards being comfortable reading a long stem and identifying which one or two constraints actually decide the answer.
- Practice reading scenarios under time pressure, but do not mistake CertGrid's mock length for an official exam specification. Confirm the current exam duration and appointment details with Microsoft.
Format, timing, and passing score
- Duration: check Microsoft's AZ-305 exam page and your appointment confirmation; exam time and total appointment time are different.
- Question count: do not assume a fixed 50-question exam. A practice provider's session size does not establish the number on your official exam.
- Passing score: 700 on Microsoft's 1-1000 reporting scale. This does not mean 70 percent of the questions correct, and a third-party practice percentage cannot be converted directly to it.
- Study time: commonly 8-12 weeks on top of an AZ-104-level foundation for someone studying part time, since much of the effort goes into learning to reason about trade-offs rather than learning new facts.
Who should take AZ-305
AZ-305 is most useful when your work involves comparing designs and explaining trade-offs. If you are still building your operational foundation, review the Microsoft certification path and decide which administration skills you need first. A certification is evidence of an assessed skill set, not a job guarantee.
The bottom line
Keep three checklists separate: the current exam objectives, the credential requirements, and your evidence of understanding. Use an architecture decision journal to explain why a design meets its constraints and what would change your recommendation. Practice results can reveal topics to revisit; they cannot guarantee an official exam result.