How internet servers work

The canonical or primary DNS domain name used in the data is required and must resolve to a valid DNS domain name in the namespace.The MicrosoftDNS container object contains one or more dnsZone container objects.When information is cached, a Time-To-Live (TTL) value applies to all cached RRs.

The DNS message header contains the following fields, in the following order.If the DHCP server does not support or is not configured to perform registration of the DNS record, then no FQDN is included in the DHCP servers response and the client attempts registration of the A and PTR resource records.A 16-bit field representing the number of entries in the answer section of the DNS message.Multivalued attribute of a dnsNode object used to store the resource records associated with the named node object.To accomplish WINS lookup, two specific resource record types are used and can be enabled for any zones loaded by the DNS service.If you change the setting of the DNS Server service, it first writes the root hints file, zones, and parameters to the locations specified in the default setting, and then the DNS Server service reads them from the new setting.Domain names consist of individual labels separated by dots, for example: mydomain.microsoft.com.

DNS zones stored in this partition are replicated to all domain controllers in the domain.The dnsZone container object contains a dnsNode leaf object for every unique name within that zone.Instead, the root hints file provides referral information that can be useful during DNS name resolution to redirect a query to other servers that are authoritative for names located beneath the root.A stub zone is a copy of a zone that contains only those resource records necessary to identify the authoritative DNS servers for that zone.

Load Data On Startup Set To: From Active Directory and Registry.At the same time, a long TTL decreases utilization of DNS servers and reduces network traffic because the DNS client answers queries using its cached data.The purposes of each of the specialized fields used in an SRV resource record are as follows.If the value of this sum is greater than current server time, no action is taken and the record continues to age in the zone.Uses a 16-bit integer to represents the resource record type that should be returned, as expressed below.For example, most resource records created by the DNS Server service inherit the minimum (default) TTL of one hour from the start of authority (SOA) resource record, which prevents extended caching by other DNS servers.The server determines whether to cache the name offered in a referral on the basis of whether or not it is part of the exact related DNS domain name tree for which the original queried name was made.The DNS server loads a primary zone enabled to use scavenging.For the new DNS domain name of the computer, a new A RR is added to the zone.

Prioritizes which DNS servers it uses according to whether they respond to a query if multiple DNS server are configured on the client.A server is a computer designed to process requests and deliver data to other (client) computers over a local network or the internet.These resource records comprise the majority of resource records in a zone database.If the DNS Client service does not receive a response from any DNS server within two seconds, the DNS Client service sends the query to all DNS servers on all adapters that are still under consideration and waits another two seconds for a response.Record update When a DNS dynamic update is processed for a resource record where other characteristics of the record in addition to its time stamp are revised.Each Active Directory object has attributes associated with it that define particular characteristics of the object.A primary DNS suffix for the computer, which is placed after the computer or host name to form the FQDN.This resets the time stamp for the record based on the method described in step 2.There is also a WINS-R record or WINS reverse lookup entry that can be enabled and added to reverse lookup zones.

Most DNS domain names have two or more labels, each of which indicates a new level in the tree.The original A RR for the old DNS domain name (and its associated PTR RR if applicable) is removed from the zone.Zone transfers can be made from both primary and secondary DNS servers.The following table lists the UDP and TCP ports used for different DNS message types.The DHCP server can update both records if it is configured to update records on behalf of DHCP clients that do not support the FQDN option.The DNS service provides the ability to configure name checking to allow or restrict the use of UTF-8 characters in DNS data.

DNS application directory partition for each domain in the forest.The following resources contain additional information that is relevant to this section.The SOA resource record is always first in any standard zone.

Using the host and primary DNS suffix examples, the full computer name is hostcomputer.corp.example.com.This can help prevent an undesired attempt by an unknown or unapproved DNS server to pull, or request, zone updates.The cached data, however, has a limited lifetime specified in the TTL parameter returned with the response data.The incremental transfer process requires substantially less traffic on a network and zone transfers are completed much faster.Listed alternate DNS servers are contacted and used when the preferred server is not available.DNS servers use this file to help locate root servers on either your network or the Internet.As the number of hosts on the Internet grew, the traffic generated by the update process increased, as well as the size of the HOSTS file.The following is a brief summary of the typical DNS notification process for zone updates.The dynamic update response message follows the same format as the DNS update message, with the exception of the DNS flags.

DNS does not use a mechanism to release or tombstone names, although DNS clients do attempt to delete or update old name records when a new name or address change is applied.If the master DNS server is a primary DNS server, then the zone transfer comes directly from the DNS server hosting the primary zone.Unless UDP datagrams larger than 512 bytes or EDNS0 are enabled, only the first 512 bytes of the UDP reply are returned.RFC 1996 -- A Mechanism for Prompt Notification of Zone Changes (DNS NOTIFY).Return code. 4-bit field containing codes to represent the result of the update query.You can view the primary DNS suffix for your computer from the Computer Name tab of SystemProperties.This message generally appears when either the server computer is shut down or the DNS Server service is stopped manually.