Ondřej Soukup

Příspěvky označené: Active Directory

What is a UPN (User Principal Name)?

UPN (user principal name) is a logon method used in Windows networks since version 2003. A UPN has two parts: a suffix and a prefix. Take suzan@WoodgroveBank.local as an example.

  • UPN prefix is suzan
  • UPN suffix is WoodgroveBank.local

By default, the suffix is the name of the domain where the user was created. Additional suffixes can be added so users can sign in with another name (such as their email address), but the suffix must be unique throughout the forest.

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Finding a suitable DC using SRV records

Using SRV records to locate a suitable domain controller when starting a local workstation (laptop) that moves between branch offices in a single domain.

At startup, while services are starting (specifically NETLOGON), each workstation sends a query to find and contact the appropriate DC for its network (subnet), through which domain users can later authenticate. The DC discovery process first contacts the last-used DC. If it is unavailable or in a different subnet, the workstation searches for a DC within or closest to its own subnet. This ensures that the workstation communicates with a DC in the same network even as it travels between branch offices and their DCs.

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SRV resource record – SRV records

SRV record (SRV record or Service record) is a category of DNS data providing information about available services.

For AD DS to function correctly, clients must be able to query records identifying the location of system services, allowing authentication against DCs and operation of services such as Exchange. A DNS server integrated with a DC provides this information through SRV records.

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