There are two ways to manage AD sites and related components. One option is to use the AD Sites and Services MMC, and the other one is to use PowerShell cmdlets. In order to add/edit/remove sites and related configurations, we need to have Domain Admin/Enterprise Admin privileges.
The AD Sites and Services MMC will be available in any server that has AD DS service enabled or any server/computer that has RSAT installed. The AD PowerShell module will also be available in any server that has the AD DS role enabled or has the RSAT tools installed.