Az-305 Designing Microsoft Azure Infrastructure Solutions Study Guide

Exam Overview

The AZ-305 certification validates your expertise in designing infrastructure solutions on the Microsoft Azure platform. It is intended for experienced Azure Solutions Architects who focus on computing, storage, network, and security services to build scalable, resilient, and secure cloud environments.

Exam Domains

• Design identity, governance, and monitoring solutions
• Design data storage solutions
• Design business continuity solutions
• Design infrastructure solutions

Key Concepts & Common Difficulties

• Governance at Scale: Candidates often struggle with balancing centralized control against decentralized autonomy. The correct approach involves implementing Azure Policy and Blueprints for consistent compliance while using Management Groups for hierarchical isolation.
• Storage Performance Tiers: Many overlook the nuanced differences between hot, cool, archive, and premium SSD tiers. Success requires mapping workload access patterns and IOPS requirements to specific storage accounts and redundancy options like LRS, ZRS, or GRS.
• Networking Hybrid Connectivity: Designers frequently confuse ExpressRoute with VPN Gateway capabilities. You must correctly choose between private peering, public peering, and Microsoft peering based on traffic flow, latency sensitivity, and bandwidth needs.
• Disaster Recovery Strategies: A common pitfall is selecting a DR solution without considering RPO and RTO constraints accurately. Evaluate whether Azure Site Recovery, Geo-Restore, or Multi-region replication best fits the business continuity requirements.
• Security Identity Integration: Integrating Azure AD with on-premises Active Directory can be complex. Focus on understanding password hash sync vs. pass-through authentication vs. federated identity to ensure seamless user experience and security posture.

Study Strategy

1. Prerequisites: Ensure you have hands-on experience with Azure services and consider holding the AZ-104 or AZ-900 certification as a foundation. 2. Study Order: Start with Governance and Identity, then move to Networking and Security, followed by Data Storage, and finally Business Continuity. 3. Practice Approach: Use scenario-based questions to practice decision-making. Focus on understanding why one solution is better than another in a given context rather than memorizing features. 4. Lab Experience: Build real-world architectures in the Azure portal to visualize how components interact. Experiment with Terraform or ARM templates for infrastructure-as-code practice. 5. Exam-Day Tips: Read each question carefully to identify keywords like "minimize cost" or "maximize availability." Eliminate obviously incorrect options first and choose the most architecturally sound solution.