A zone contains all the information about a domain except for the parts of the domain delegated to other name servers.
An AD DNS zone is a collection of hierarchical domain names with the root domain delegated to one or more name servers. The management of the DNS database is made easy by dividing the DNS namespace into multiple zones and assigning the responsibility of a zone to a particular server. The DNS has a distributed database which means that information about all the domains, subdomains, and host mappings are not stored on just one DNS server but distributed across multiple servers. Thus, without the DNS, a client wouldn’t be able to authenticate into AD or find various services. The client further asks the DNS using this hostname to obtain the DC’s IP address. The DNS then retrieves the SRV record from its database and provides the DC’s hostname to the client.
When a client computer joins a network, it locates the DC by asking a query to the DNS. The DC also registers AD DNS Service (SRV) records which help in mapping services like Kerberos and LDAP to itself. IN SRV 0 5 80 .Ī DC registers an AD DNS entry at boot time with an A record. Identifies the mail server for a particular domain Makes one domain an alias of another domainġ1.54.9. Some of the common types of DNS resource records are: Record Type DNS has a database that maintains resource records, which helps identify various servers, domains, and services on the network. Active Directory supports such Dynamic updates to be made.ĪD depends on DNS for name resolution and locating resources on a network. Any newly installed server can also automatically register its IP address and SRV records with the DNS server. Hence Dynamic DNS is required to make these updates automatic.
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For example, a name resolution may first query an Internet root server, then the first–level domain server, and then the second–level domain server, and so on to resolve the name to its associated address.Įvery time the computer’s IP address changes, making manual entries into the DNS database is time-consuming and might result in some entries being left out. If the requested information is not available, then it forwards the query to another DNS server. Each DNS server queries its own database to find an address corresponding to a record. Several DNS servers are used in the process. These SRV records are used to identify the domain controllers also.Ī single DNS server cannot help in resolving a resource record. Service records allow a client in an active directory environment to locate any service it needs such as a printer. The list of services running is maintained in the form of service records (SRV). In the case of Active Directory, DNS maintains a database of services that are running on that network. The reason behind the choice of DNS is that it is highly scalable and it is an internet standard. DNS namespace is used internet-wide while the Active Directory namespace is used across a private network.
It is used on TCP/IP networks and across the internet. Domain Name System (DNS) is a name resolution method that is used to resolve hostnames to IP addresses.