What directive must be configured in the Samba configuration file to allow anonymous user access to a share?

To allow anonymous user access to a Samba share, the directive that needs to be configured in the Samba configuration file is "guest ok = yes." This directive explicitly permits guest access to the share. When set to 'yes,' it tells Samba to allow users who are not authenticated to access the specified share, thereby treating them as guest users.

This configuration is particularly useful for scenarios where shared resources need to be accessible without requiring users to log in, such as in public or community file-sharing contexts. It's important to combine this directive with proper share definitions to ensure that the desired directories are shared correctly and that any related permissions allow access as intended.