An administrator configures a new destination list in Cisco Umbrella so that the organization can block specific domains for its devices. What should be done to ensure that all subdomains of domain.co

Configuring '*.com' would block all domains under the .com top-level domain, which is overly broad and would severely disrupt internet access.

While '*.domain.com' would block subdomains, it is not strictly necessary in Cisco Umbrella as blocking 'domain.com' directly achieves the same outcome for subdomains.

The wildcard format '*domain.com' is generally not a valid or standard way to block all subdomains of 'domain.com' in most DNS-based filtering systems, and is superseded by Umbrella's default behavior.

In Cisco Umbrella, adding the root domain (e.g., domain.com) to a destination block list automatically ensures that all its subdomains are also blocked by default, simplifying policy configuration.