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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Naming conventions in Active Directory for computers, domains, sites, and OUs
In this articleThis article describes the naming conventions for computer accounts in Windows, NetBIOS domain names, DNS domain names, Active Directory sites, and organizational units (OUs) that are defined in the Active Directory directory service. Applies to: Windows Server 2012 R2 SummaryThis article discusses the following topics:
All objects that are named within Active Directory, or within AD/AM and LDS, are subject to name matching based on the algorithm described in the following article: You cannot add a user name or an object name that only differs by a character with a diacritic mark. In that article, this naming convention applies to computer, OU, and site names. Computer namesNetBIOS computer names
DNS host names
Domain namesHere are details for NetBIOS domain names and DNS domain names. NetBIOS domain names
DNS domain names
Disjointed namespacesA disjointed namespace occurs when a computer's primary DNS suffix doesn't match the DNS domain of which it is a member. For example, a disjointed namespace occurs when a machine that has the DNS name of How disjointed namespaces occur:
Effects of a disjointed namespace: Suppose a domain controller named DC1 resides in a Windows NT 4.0 domain whose
NetBIOS domain name is contoso. This domain controller is upgraded to Windows 2000. When this upgrade occurs, the DNS domain is renamed The domain controller dynamically registers its service location (SRV) records in the DNS zone that corresponds to its DNS domain name. However, the domain controller registers its host records in the DNS zone that corresponds to its primary DNS suffix. For more information about a disjoint namespace, see the following articles:
Other factors
Site namesWe recommend that you use a valid DNS name when you create a new site name. Otherwise, your site will be available only where a Microsoft DNS server is used. For more information about valid DNS names, see the DNS host names section.
OU names
Special issuesWhen the OU at the domain root level has the same name as a future child domain, you might experience database problems. Consider a scenario where you delete an OU named marketing to create a child domain with
the same name, for example, The OU is deleted and during the tombstone lifetime of the OU you create a child domain that has the same name is created, deleted, and created again. In this scenario, a duplicate record name in the ESE database causes a phantom-phantom name collision when the child domain is re-created. This problem prevents the configuration container from replicating. Note A similar name conflict might also happen with other RDN name types under certain conditions, not restricted to DC and OU name types. Table of reserved words
Additional resourcesAdditional resourcesIn this articleWhat computers are the highest authorities in the domain name system hierarchy?The DNS root level is the highest in the DNS hierarchy tree because it is the first step in resolving a domain name. The root DNS server is the DNS for the root zone.
Which type of DNS record identifies an email server?A DNS 'mail exchange' (MX) record directs email to a mail server.
Which two hosts on your network are likely to be causing the increased traffic and why?Which two hosts on your network are likely to be causing the increased traffic and why? the secondary and primary DNS servers, because the secondary server is requesting zone transfers from the primary server.
What decimal number corresponds to the binary number 11111111 quizlet?What decimal number corresponds to the binary number 1111 1111? - IPv4 ADDRESSES The largest possible 8-bit number is 1111 1111, which is equal to 255 in decimal. Each of the 4 octets can be any number from 0 to 255. Suppose you send data to the 11111111 11111111 11111111 11111111 IP address on an IPv4 network.
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