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1. WHAT DOES THE ACTIVE DIRECTORY DOMAIN SERVICES MEAN FULL
2. WHAT DOES THE ACTIVE DIRECTORY DOMAIN SERVICES MEAN PC

DNS servers give authoritative, or final, answers to request with the zones they are configured to be responsible for. A zone comprises a DNS name, such as "", and all the names beneath that level, such as "", or "". Technically a FQDN should also specify the root zone which is a blank domain name specified by a dot at the end of the domain name, such as "but in practice the root zone is often omitted.Įach DNS name server is responsible for different parts of this hierarchy, known as a zone.

WHAT DOES THE ACTIVE DIRECTORY DOMAIN SERVICES MEAN FULL

A DNS name that resolves to a specific device or piece of data is known as a full qualified domain name (FQDN). com domain, and can itself contain multiple subdomains like "". These subdomains can themselves contain subdomains, up to 127 layers deep. net, etc.) is known as the top-level domain (TLD), every domain beneath that level is known as a subdomain. Each segment represent a different parts of the hierarchy, called a domain. For the most part, DNS is fast and reliable, but it is important to remember that a lookup failure from time to time is not-unexpected.Ī DNS name is segmented into different parts by dots. With UDP there is no guarantee of message or response delivery, and since users expect name resolution to be fast and seamless, timeout for a DNS reply is short (3 seconds is the Windows, 5 seconds the Linux default). DNS names do not necessarily resolve to only a single address either, they can correspond to multiple other records and can even refer to other records recursively using records like a CNAME.ĭNS requests go out primarily over UDP. Active Directory DNS servers are typically recursive and serve all DNS requests for PCs within the domain. The DNS name servers then looks up the address and returns a response or forwards the request on to another server for resolution if it is a recursive DNS server.

WHAT DOES THE ACTIVE DIRECTORY DOMAIN SERVICES MEAN PC

Actual name resolution in Windows is a somewhat complex topic, but in general a Windows PC checks its local name, then its hosts file, then makes a DNS request (unless the name is in its cache). Virtually every time a domain name is resolved, be it by a web-browser or some other source, a DNS inquiry is made. However this phone book is of gigantic size (there are ~4 billion IPv4 address alone) and constantly changing so DNS uses a hierarchical system to determine which phone book, or name server, is responsible for which sets of addresses. A DNS server serves as a sort of computer phone book that can be used to rapidly translate computer names to IPs (or other sorts of data). An often used analogy is that of a phone book. Thus in order to understand Active Directory domain naming it is important to understand DNS.ĭNS is the system, used to translate names into other types of data for computer consumption, such as an IP address (an A record) or any of a number of other record types. Active Directory Domain names are controlled by the same set of rules and principles, that govern traditional Domain Name Systems (DNS). It "defines a realm of administrative autonomy, authority, and control" for a group of computers. There have been religious debates on this issue, and MS recommendations have changed over time.Īn Active Directory (AD) domain is basically the same as an internet domain. And one that is important to get right the first time, as changing it later is a non-trivial task.

Picking an Active Directory domain name is one of the most important steps in setting up a domain.