The Get-BrokerSite PowerShell cmdlet is used to retrieve the top-level object that represents the entire Citrix Virtual Apps and Desktops deployment. This command provides fundamental configuration information about the overall "setup," including the site name, licensing configuration, trust settings, and other site-wide policies. It gives a comprehensive overview of the deployment's core configuration, which is what an engineer would need to understand the setup as a whole. The other cmdlets query more specific components or dynamic states within the site.

B. Get-BrokerController: This command is too specific; it retrieves information only about the Delivery Controllers registered within the site, not the entire site configuration.

C. Get-BrokerDesktop: This command retrieves information about specific virtual desktops (VDAs) registered with the broker, which is only one component of the overall setup.

D. Get-BrokerSession: This command retrieves dynamic information about active user sessions, not the static configuration of the Citrix site itself.

1. Citrix Official Documentation, Broker PowerShell SDK: The documentation for Get-BrokerSite explicitly states, "Gets the broker site object. The broker site is a top-level, logical representation of a Citrix Virtual Apps and Desktops deployment." This confirms its purpose is to provide information about the entire setup.

Source: Citrix Virtual Apps and Desktops SDK Documentation, "Get-BrokerSite".

2. Citrix Official Documentation, Broker PowerShell SDK: The documentation for Get-BrokerController describes its function as, "Gets controllers that are registered with the site." This highlights its specific focus on the controller component.

Source: Citrix Virtual Apps and Desktops SDK Documentation, "Get-BrokerController".

3. Citrix Official Documentation, Broker PowerShell SDK: The documentation for Get-BrokerDesktop states its purpose is to "Gets desktops that have been registered with the broker." This confirms it is used for querying VDA information, not the entire site.

Source: Citrix Virtual Apps and Desktops SDK Documentation, "Get-BrokerDesktop".