What is authoritative and non authoritative DNS?
An authoritative answer comes from a nameserver that is considered authoritative for the domain which it’s returning a record for (one of the nameservers in the list for the domain you did a lookup on), and a non-authoritative answer comes from anywhere else (a nameserver not in the list for the domain you did a lookup …
What is Auth DNS server?
The authoritative DNS server is the final holder of the IP of the domain you are looking for. When you write a domain name in your browser, a DNS query is sent to your internet service provider (ISP). The ISP has a recursive server, which might have the needed information cached in its memory.
What are the two types of DNS?
The three different types of DNS server interoperate to deliver correct and current mappings of IP addresses with domain names….The three DNS server types server are the following:
- DNS stub resolver server.
- DNS recursive resolver server.
- DNS authoritative server.
What is a non authoritative RR?
Non authoritative servers do not contain copies of any domains. Instead they have a cache file that is constructed from all the DNS lookups it has performed in the past for which it has gotten an authoritative response. Thus, non-authoritative servers can answer authoritatively for a given resolution request.
What happens if a DNS reply exceeds 512 bytes?
Whatever the case, when the message size exceeds 512 bytes, it will trigger the ‘TC’ bit (Truncation) in DNS to be set, informing the client that the message length has exceeded the allowed size. In these situations, the client needs to re-transmit over TCP, which has no size limit.
What are the three levels of DNS servers?
3 types of DNS servers—DNS Resolver, DNS Root Server and Authoritative Name Server.
What is a Type 65 DNS query?
DNS Type 65 is a draft RFC for HTTPS binding. At this time, this record type is not currently supported on certain features of BIG-IP DNS. There are currently no options to configure a specific response to a type 65 record.
What is alias in DNS?
An ALIAS record is a type of DNS record that points your domain name to a hostname instead of an IP address.
