Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company hosts a multi-tenant SaaS web application in two Azure regions. You must expose a single public HTTPS endpoint that provides global load balancing with URL path-based routing, optional session affinity, integrated web application firewall (WAF), and automatic failover to the secondary region within seconds if the primary becomes unavailable. Which Azure service should you choose for the public load-balancing layer?
Azure Load Balancer Standard with cross-region load balancing
Azure Front Door Standard or Premium tier
Azure Traffic Manager using Priority routing
Azure Application Gateway v2 deployed in one region
Azure Front Door Standard/Premium is designed to front highly available global web applications. It offers a single anycast-based public URL, performs layer-7 HTTP(S) load balancing with path-based routing, can enable cookie-based session affinity, and includes an integrated WAF. Health probes run continuously; if a regional backend becomes unhealthy, traffic is automatically rerouted to the next closest healthy backend within seconds.
Azure Traffic Manager is DNS-based, so failover speed is limited by DNS TTL and it cannot perform path-based routing or inspect layer-7 traffic. Application Gateway provides layer-7 routing and WAF but is scoped to a single region; cross-region resilience requires additional components. Standard Azure Load Balancer operates at layer 4 and lacks path-based routing and WAF. Therefore, Azure Front Door Standard/Premium best meets all stated requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design infrastructure solutions
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