inter-domain routing
{{Use American English|date=December 2019}}
{{Unfocused|date=January 2025|reason=it seems to conflate Active Directory Domains and internet Autonomous systems|talk=Conflation of concepts?}}
Inter-domain routing is data flow control and interaction between Primary Domain Controller (PDC) computers. This type of computer uses various computer protocols and services to operate. It is most commonly used to multicast between internet domains.{{Cite web|url=https://technet.microsoft.com/en-us/library/bb727007.aspx|title=Domain Name System Overview|publisher=Microsoft Technet 18 April 2006|accessdate=12 February 2011}}
Internet use
An Internet service provider, ISP, is provided with a unique URL access address. This address is a unique number. The number for each ISP is stored within a DNS server. The DNS servers interpret the ISP URL Domain name and provide the appropriate IP address number. The Domain is under the control of a specialized computer, called a PDC, (primary domain controller).{{Cite web|url=https://technet.microsoft.com/en-us/library/cc779648%28WS.10%29.aspx|title=Domain controller role: Configuring a domain controller|publisher=Microsoft Technet 26 August 2009|accessdate=12 February 2011}} This computer holds records of all the user accounts within the domain, their rights to access information, and lists of approved System Operatives. This PDC is backed up by an SDC, (a secondary domain controller), this computer synchronises itself with the PDC and takes over the role in the event of a PDC failure.{{Cite web|url=https://technet.microsoft.com/en-us/library/cc785013%28WS.10%29.aspx|title=Install Active Directory on the Second Domain Controller|publisher=Microsoft Technet 28 March 2003|accessdate=12 February 2011}} Multiple replication servers connect to these control computers and they are routed to the Internet backbone to provide the requested data to and from the domain.{{Cite web|url=https://technet.microsoft.com/en-us/library/ms151196.aspx|title=Peer-to-Peer Transactional Replication - date undisclosed|accessdate=12 February 2011}}
=Communication protocols=
Internet protocols that are focused on inter-domain functions include: Border Gateway Multicast Protocol, Classless Inter-Domain Routing, Multicast Source Discovery Protocol, and Protocol Independent Multicast.
=Services=
A PDC uses a number of special computer programs to announce its presence to other domain controllers. It uses Windows Internet naming service WINS{{Cite web|url=https://technet.microsoft.com/en-us/library/cc784180%28WS.10%29.aspx|title=What Is WINS?|publisher=Windows Technet 28 March 2003|accessdate=12 February 2011}} and Browser{{Cite web|url=http://www.microsoft.com/resources/documentation/windowsnt/4/server/reskit/en-us/net/chptr3.mspx?mfr=true|title=Windows NT Browser Service|publisher=Windows Technet - date undisclosed|accessdate=12 February 2011}} services to allow other computers to gain access to digital information that it has control over.
===Other===
The opposite of inter-domain routing is intra-domain routing, routing within a domain or an autonomous system.
References
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