What should an administrator do to make a Google Site accessible using a custom URL?

To make a Google Site accessible using a custom URL, the administrator needs to configure a web address mapping in the Admin console. This involves associating the custom URL with the Google Site, allowing users to access it directly through the new URL rather than using the default Google Sites URL. By doing this, the site not only becomes accessible under the specified domain name but also enhances its branding and user experience, as a custom URL is easier to remember and more professional.

The mapping process involves specifying the desired URL and linking it properly within the administrative settings to ensure that it resolves correctly to the content hosted on Google Sites. This step is crucial for organizations that want to maintain a consistent online presence and make their sites easily accessible to team members or external users.