Content Delivery Network
global service caches static content at points of presence all around the world.

allows us to make all content searchable, and provide search suggestions and fuzzy search results to our users.

• area with a single geography that contains one or more Azure datacenters
• updates and planned maintenance are done on only one region at a time.

calculate the overall SLA for the app as a composite of all other services SLAs.

• multiplying together the SLAs of the component services

resource group doesn't limit us to use the same Azure region for the included resources

uses the DNS system to route traffic

• YES: it routes any protocol, not just HTTP traffic
• NO can't route or filter traffic based on HTTP properties, such as client country codes or user-agent headers
• NO: can't do Transport Layer Security (TLS) protocol termination

highly configurable: protocol, port, path, custom header, number of failures

• global load balancer
• it works at the network application layer, Layer 7, and uses HTTP and HTTPS properties to do filtering and routing

• YES: route traffic based on the browser's country code.
• YES: supports TLS protocol termination
• BUT: If we want to route traffic for any protocol other than HTTP and HTTPS, we'll have to use Traffic Manager.

When should you perform a full failover to another region

• When you know definitively, that a region is down.