|The World Wide Web and the Internet are vast virtual frontiers which depend on complex computer codes and computer languages to locate and share information and data. One of the basic tools of this internet is the Domain Name System (DNS), a system that maintains the hierarchical list of all internet domain names. It consists of a central database that contains records for every domain name registered in the system. The records include the names, addresses, email addresses, telephone numbers, sub-domains, and other relevant information about the domain name owner.|
Nameserver is a feature of dns servers that help users in finding an IP address using the domain name. In this service the user types in a domain name and after clicking on Enter the machine registers the domain names in its memory. A nameserver can be either cache or authoritative.
When an individual nameserver is used, it will act as the authoritative name server which will give instructions to the other nameservers regarding which domain name to register. As each nameserver registered additional information is added to the list. Each nameserver can be individually deleted by the user at any time. Once an IP address has been registered with a nameserver there is a list of zones from which it can be requested. The individual nameservers use a cache to hold only the information that is associated with the domain names that have been previously registered.
The DNS queries are sent to the root server which is programmed to return the corresponding answers to the client. The root server stores all the relevant information about a domain including the DNS server zones and records for the DNS zone containing the query. The DNS server is configured to return results based on the query entered by the user. The DNS queries can be resolved either by a query with the DNS server using the DNS server reply or by an authoritative name server, both of which use different procedures to locate the answer.
In the DNS resolution method, the DNS server looks up the DNS server reply that was previously given and checks if this answer is consistent with the information entered by the user. If these parameters are not consistent, then the query is considered to be outdated or stale. The user will receive a message from the DNS server indicating that there are no updated records for the domain names that are part of this domain nameserver.
If you want to update any of the DNS records associated with domain names, then you will have to send a DNS reset command to the nameservers and the DNS servers. A reset is sent to remove any accidental or intentional duplicates of a domain record and is only effective during a maintenance period of six months or more. This cannot be used to reset the authoritative or root DNS records or any other DNS records associated with domain names.
There is another type of scenario that may result in multiple nameservers pointing to one IP address. This scenario happens when you have more than one nameserver registered on the same IP address. Multiple nameservers are setup for the same domain but their IP addresses are not listed in the IANA server. In some cases, the primary DNS server might not respond or produce a DNS reply to the queries made for the domain name that is point to by these nameservers. In this case, it is recommended that the secondary DNS servers be used instead of redirecting the domain name to the secondary nameservers.
There are some DNS servers that support cache flush and caches which are used to reduce the response time of DNS queries. However, it is important to note that cache flush or disable-flush can affect DNS queries sent with ICQ or Microsoft Outlook. With this feature, DNS queries sent with this application become slower. As a result, the DNS client may not be able to locate the requested domain name. To resolve this issue, the server that hosts the authoritative name server must be disabled or the DNS server must be restarted after disabling the cache. To conclude, it is recommended that you must test your web host or DNS provider to ensure that they provide sufficient support and services.