You need to create an HTTP-proxy policy for a specific domain with multiple subdomains. Which approach is best for defining the destination?

Defining the destination for an HTTP-proxy policy using an FQDN for *.example.com is the most effective approach because it allows you to cover all subdomains associated with the domain "example.com" in a single configuration. By utilizing the wildcard syntax, you ensure that any request directed at any subdomain, such as "sub1.example.com" or "sub2.example.com," is captured by this policy without needing to define each one individually.

This method streamlines policy management and reduces the possibility of oversight, where some subdomains might be left unconfigured if handled separately. Wildcards are particularly useful in scenarios where new subdomains may be added over time, as they will automatically be included in the existing policy without further adjustments.

In contrast, configuring just a specific hostname restricts the policy application to a single subdomain, and adding individual IP addresses for each subdomain would be cumbersome and inefficient, especially with numerous subdomains. Similarly, creating an alias for known IP addresses does not effectively address changes in subdomains, particularly when they may not have static IPs. Thus, using an FQDN with a wildcard is the most efficient and future-proof method for managing policies that involve multiple subdomains.