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This article assumes you already know Azure Load Balancer and Azure Application Gateway — the two primary load balancers emphasized for exam purposes. Azure also provides several additional traffic-distribution and global delivery options. Below is a clearer, structured comparison of the most common alternatives, their features, and when to use each.

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Azure Front Door

  • Global, edge-native application delivery network that provides fast, reliable content delivery and global load balancing via the Microsoft Global Edge Network.
  • Operates at Layer 7 (HTTP/HTTPS) and supports:
    • Global anycast-based routing
    • SSL termination (SSL offload)
    • Path-based and multi-site routing
    • Routing to multiple backend pools
    • Optional Web Application Firewall (WAF)
  • Common use cases: global web applications or microservices requiring low-latency global entry, CDN-like caching/optimizations, and application-layer routing.

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Azure Traffic Manager

  • DNS-based traffic-routing service that returns DNS responses to direct clients to endpoints; it does not proxy or terminate traffic.
  • Protocol-agnostic because it operates at the DNS level (does not inspect or modify traffic).
  • Routing methods include Priority, Weighted, Performance, Geographic, Multivalue, Subnet, and nested profiles for complex topologies.
  • Can target endpoints in Azure, other clouds, or on-premises — any publicly resolvable endpoint.
  • Common use cases: global DNS-level distribution, cross-region failover, geographic routing, and directing clients based on latency.

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Key differences — quick summary

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Protocol support

  • Application Gateway and Front Door: HTTP, HTTPS, HTTP/2 (application-layer).
  • Azure Load Balancer: TCP and UDP (transport-layer).
  • Traffic Manager: Protocol-agnostic (returns DNS responses only).

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Scope and cross-region behavior

  • Application Gateway: deployed in a region and scoped to a virtual network.
  • Front Door: global, using Microsoft’s edge locations for routing.
  • Load Balancer: typically regional — consult Azure docs for global load-balancing features.
  • Traffic Manager: global DNS routing; the resource metadata lives in a region but routing is global.

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Environment and security

  • Application Gateway, Front Door, Traffic Manager: can be used with Azure-hosted and external endpoints (public endpoints required for non-Azure resources).
  • Load Balancer: targets backend resources within Azure (VMs, VM scale sets, NICs, IPs).
  • Security:
    • Application Gateway & Front Door: offer WAF for application-layer protection. Combine with Network Security Groups (NSGs) for backend protection.
    • Load Balancer: relies on NSGs and other Azure network controls (no built-in WAF).
    • Traffic Manager: has no traffic-inspection features since it only returns DNS answers.

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When to choose which service

  • Use Application Gateway when you need a regional, application-layer proxy with WAF and advanced routing (path-based routing, cookie affinity) for web servers hosted in a VNet.
  • Use Front Door when you need a global entry point with edge caching, low-latency global routing, SSL offload, and WAF for multi-region web apps.
  • Use Azure Load Balancer when you need high-performance, low-latency Layer 4 distribution for TCP/UDP workloads inside Azure.
  • Use Traffic Manager when you want DNS-based routing across regions or providers for failover, geo-routing, or latency-based redirection without proxying traffic.
A presentation slide titled "Comparing Load Balancing Solutions" showing a table that compares four Azure offerings—Application Gateway, Front Door, Load Balancer, and Traffic Manager—across features like usage, protocols, cross-region support, environment, and security. There's also a "Reference architecture examples" link at the bottom.
See Microsoft’s load-balancing guidance and decision flowcharts for detailed reference architectures and scenario-based recommendations: https://learn.microsoft.com/en-us/azure/architecture/best-practices/load-balancing
Further reading and references: That covers the primary alternative load-balancing and traffic-distribution options in Azure and guidance on when to use each.

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