How to Pass Technical Screening Interviews for Azure Solutions Architect Expert (AZ-305)
A complete step-by-step masterclass on passing AZ-305 technical screening interviews, Cloud Adoption Framework (CAF) Landing Zones, Azure Hub-Spoke topology, Cosmos DB multi-region architecture, and zero-RPO DR.
Summary: Master Cloud Adoption Framework (CAF) Enterprise Scale Landing Zones, Hub-Spoke networking, Cosmos DB consistency levels, Azure SQL Hyperscale, and ASR zero-RPO DR for AZ-305 interviews.
1. AZ-305 Exam & Lead Azure Architect Screening Scope
The Microsoft Certified: Azure Solutions Architect Expert (AZ-305) validates expert capability to design cloud and hybrid solutions running on Microsoft Azure. 1. **Design Identity, Governance, and Monitoring Solutions (25–30% Weighting):** Identity integration, Authentication/Authorization, Management Groups, Governance policies, Monitoring. 2. **Design Data Storage Solutions (25–30% Weighting):** Relational data (Azure SQL / Postgres), Non-relational data (Cosmos DB), Data integration (Data Factory / Synapse). 3. **Design Business Continuity Solutions (19–25% Weighting):** High availability, Backup/Restore, Disaster recovery (ASR). 4. **Design Infrastructure Solutions (25–30% Weighting):** Compute options, Network topology, Application messaging, Automation (Bicep/ARM).
2. Microsoft Cloud Adoption Framework (CAF) & Landing Zones
**Interview Scenario:** *"What are Enterprise-Scale Landing Zones in the Microsoft Cloud Adoption Framework (CAF), and why are they critical for corporate Azure governance?"* * **Enterprise Landing Zone Concept:** Pre-architected Azure environment subscription templates providing identity, governance, security, and networking controls. * **Platform Landing Zones:** Centralized management subscriptions: - **Management Subscription:** Log Analytics workspaces and Azure Monitor. - **Identity Subscription:** Entra ID Connect domain controllers. - **Connectivity Subscription:** Hub VNet, Azure Firewall, ExpressRoute circuits. * **Application Landing Zones:** Isolated subscriptions housing specific application workloads, inheriting central policies automatically.
3. Enterprise Network Architecture: Hub-and-Spoke Topology
**Interview Scenario:** *"Walk me through the design of an Azure Hub-and-Spoke network topology with forced perimeter inspection."* * **Central Hub VNet:** Houses shared networking services: - **Azure Firewall Premium:** Centralized egress filtering and IDPS inspection. - **ExpressRoute Gateway:** Dedicated high-speed connection to on-premises datacenters. - **Azure Bastion:** Secure RDP/SSH access without public IPs. * **Spoke VNets:** Workload VNets peered to the Hub VNet. * **Forced Tunneling UDRs:** User-Defined Routes attached to Spoke subnets (`0.0.0.0/0 -> Azure Firewall Private IP`) forcing all internet traffic through the central Hub Firewall.
4. Enterprise Data Architecture & Cosmos DB Consistency Levels
**Interview Scenario:** *"Explain the 5 consistency levels of Azure Cosmos DB and when to choose each for global application backends."* 1. **Strong Consistency:** Linearizability. Reads guaranteed to return most recent committed write. Highest latency. 2. **Bounded Staleness:** Reads lag behind writes by at most $K$ versions or $T$ time interval. Ideal for global apps needing predictable freshness. 3. **Session Consistency (Default):** Monotonic reads/writes within a client session. Ideal for social media e-commerce carts. 4. **Consistent Prefix:** Guarantees reads never see out-of-order writes. 5. **Eventual Consistency:** Weakest consistency; lowest latency and highest availability ($99.999\%$).
5. Business Continuity & Disaster Recovery (BCP/DRP) Strategy
**Interview Scenario:** *"How do you architect a zero-RPO Disaster Recovery solution for mission-critical enterprise workloads on Azure?"* * **Azure SQL Auto-Failover Groups:** Active-Passive geo-replication with automatic failover policies. Synchronous commit mode provides $ ext{RPO} = 0$. * **Azure Front Door:** Global Anycast HTTP/HTTPS load balancer providing instant health-probe failover between primary and secondary regional App Services. * **Azure Site Recovery (ASR):** Orchestrates continuous asynchronous VM block replication to paired secondary regions with non-disruptive DR drills.