• AD is source of truth
• Entra ID instance can sync from only one Entra connect sync
• One AD can sync to multiple Entra IDs

Types

• Entra connect sync (deployed in Windows VM)
• Entra connect cloud sync (Agents are deployed where needed/runs in cloud)

License requirements

P1

Architecture

|Entra ID|Azure|
|connector space|Entra objects|
|metaverse|
|connector space|AD objects|
|ADDS|Onprem|

Azure AD Connect Pre-Reqs
Export Configuration of Existing Azure AD Connect Server
Azure AD Connect Upgrade From Old Version to New Version

references:

Azure AD Connect: Version release history - Microsoft Entra | Microsoft Docs
Technical Concepts
Topologies for Entra Connect