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Introduction to Azure Application Gateway | AZ-104 | Episode 14

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Overview of Application Gateway

  1. Azure Application Gateway is introduced as a regional layer 7 application load balancer used to provide application-aware routing and firewall capabilities.
  2. The module focuses on understanding Application Gateway features, where it fits in a solution, and what administrators may need to configure.

Layer 4 vs Layer 7 Load Balancing

  1. Traditional Azure Load Balancer operates at layer 4, the transport layer, and is efficient at routing traffic but does not understand application-level details.
  2. Application Gateway operates at layer 7, allowing it to inspect application traffic and make routing decisions based on higher-level request information.
  3. Application Gateway includes a web application firewall, while a traditional load balancer does not provide those inspection and firewall capabilities.

Deployment and Placement

  1. Application Gateway is a regional service and can be public-facing or private depending on the application architecture.
  2. It is commonly placed in front of Azure application resources and can also sit behind global services such as Traffic Manager or Azure Front Door.
  3. It combines application firewall processing with routing and load balancing to backend services.

Routing Features

  1. Application Gateway supports path-based routing and multiple-site routing based on request headers and URL information.
  2. Path-based routing can send traffic such as contoso.com/images to a specific backend pool.
  3. Multiple backend pools can be configured so one Application Gateway supports several routing paths without requiring separate gateways for each path.
  4. Multi-site routing can route traffic for different host names, divisions, or customer groups to common or specific backend services.

SSL Offloading and Backend Load Balancing

  1. Application Gateway supports SSL offloading, allowing HTTPS traffic to terminate at the gateway and optionally forward HTTP traffic to backend services.
  2. After firewall inspection and routing decisions, Application Gateway performs layer 7 load balancing across the selected backend pool.

Course Wrap-Up

  1. The session summarizes Application Gateway as a regional layer 7 load balancing and firewall service with SSL offloading, path-based routing, and site-based routing.
  2. Application Gateway is positioned as one tool among Azure networking options, alongside traditional Load Balancer, Front Door, and Traffic Manager.

Actiepunten

  1. Continue learning by watching other videos in the course or exploring more on Microsoft Learn.