What does it mean by non-authoritative answer in nslookup?
Non-authoritative answer simply means the answer is not fetched from the authoritative DNS server for the queried domain name.
What are the differences between authoritative and caching only DNS servers?
A cache-only server is a server that is not a master server for any zone other than the in-addr.arpa. domain. A cache-only server handles the same kind of queries from clients that authoritative name servers perform. But the cache-only server does not maintain any authoritative data itself.
What does Authoritative mean in DNS?
An authoritative server is the authority for its zone. It queries and is queried by other name servers in the DNS. The data it receives in response from other name servers is cached. Authoritative servers are not authoritative for cached data.
What is authoritative answer in nslookup?
Authoritative answer – This is the answer that originates from the DNS Server which has the information about the zone file. Non-authoritative answer – When a nameserver is not in the list for the domain you did a lookup on. Different port – By default, the DNS servers use port 53.
What’s the difference between recursive DNS and authoritative DNS nameserver?
There are two types of DNS servers: authoritative and recursive. Authoritative nameservers are like the phone book company that publishes multiple phone books, one per region. Recursive DNS servers are like someone who uses a phone book to look up the number to contact a person or company.
What is non authoritative DNS?
Non-authoritative name servers do not contain original source files of domain’s zone. They have a cache file for the domains that is constructed from all the DNS lookups done previously. If a DNS server responded for a DNS query which doesn’t have original file is known as a Non-authoritative answer.
What is a non-authoritative DNS server?
What is a non-authoritative restore?
A non-authoritative restoration is a process in which the domain controller is restored, and then the Active Directory objects are brought up to date by replicating the latest version those objects from other domain controllers in the domain.
Can a DNS server be both authoritative and recursive?
DNS servers, both authoritative and recursive, are getting increasingly complex and are undoubtedly part of the critical infrastructure that keeps the Internet running. It is important to ensure that the proper monitoring tools are in place and that any degradation of service can be easily investigated.
How do I find the authoritative DNS answer?
Without getting into the details about how DNS works I’ll simply say that in order to get an authoritative answer you need to query the name server(s) that is/are authoritative for the domain/name you’re querying. Yahoo’s name serves are not authoritative for the stackoverflow.com DNS namespace.
How do I make my DNS authoritative?
To use a DNS Server Group with Primary zones, only Secondary DNS servers should be configured. To create an authoritative DNS server group, complete the following: From the Cloud Services Portal, click Manage -> DNS -> DNS Server Groups -> Create -> Authoritative DNS Server Group.
What type of DNS server is authoritative for a specific domain?
The second type of DNS server holds a copy of the regional phone book that matches IP addresses with domain names. These are called authoritative DNS servers. Authoritative DNS nameservers are responsible for providing answers to recursive DNS nameservers about where specific websites can be found.
What is authoritative vs non-authoritative restore?
Authoritative restore will update existing DCs with the restored data which will eventually replicated to all other DCs in multi DC environment. But Non-authoritative restore will replicate the existing data from another DC to the one on which you performed restore.
What is Non-Authoritative DNS Server? Non-authoritative name servers do not contain original source files of domain’s zone. They have a cache file for the domains that is constructed from all the DNS lookups done previously. If a DNS server responded for a DNS query which doesn’t have original file is known as a Non-authoritative answer.
Why do DNS servers return authoritative answers?
If you directly query to these DNS servers, they will return authoritative answer because they have the original files of domain zone.
How do I get an authoritative DNS record?
Whenever you query a DNS record on your local DNS server, it returns a non-authoritative (unofficial) answer. If you want an authoritative answer, you must explicitly specify the authoritative DNS server when you use nslookup or other utilities. I think a local DNS server should be called caching DNS server.
What is an example of a non-authoritative answer?
For example, we query for DNS records of domain tecadmin.net and Google’s open DNS server 8.8.8.8 responded for this query which doesn’t contain domain’s original zone files. This answer is known as a Non-authoritative answer.