Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Contoso operates a public SaaS API that is deployed in active-active mode across three Azure regions. You must design a single entry point that: terminates TLS, supports path-based routing and session affinity, automatically directs each client to the lowest-latency healthy backend, and performs fail-over to another region within seconds if an outage occurs, without relying on client DNS cache expiration. Which Azure service best meets these requirements?
Azure cross-region Standard Load Balancer
Azure Application Gateway deployed in each region and distributed by Azure DNS weighted records
Azure Front Door provides global HTTP/HTTPS load-balancing from Microsoft edge points of presence. It performs TLS termination, URL and path-based routing, and optional cookie-based session affinity, while continuously probing backend health. Because traffic is steered at Layer 7 through a single anycast IP that stays constant even when a backend becomes unhealthy, Front Door can redirect new connections to another healthy region within seconds and does not depend on client-side DNS TTL expiry. Azure Traffic Manager works only at the DNS layer, offers no path routing or SSL offload, and its fail-over speed is limited by DNS caching. Deploying Azure Application Gateway in each region behind Azure DNS still relies on DNS-based routing and lacks global anycast acceleration. A cross-region Azure Standard Load Balancer operates at Layer 4 without TLS termination or path-based routing, so it cannot satisfy the requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design infrastructure solutions
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