Are DNS queries iterative and recursive?
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Are DNS queries iterative and recursive?
A recursive DNS lookup is where one DNS server communicates with several other DNS servers to hunt down an IP address and return it to the client. This is in contrast to an iterative DNS query, where the client communicates directly with each DNS server involved in the lookup.
How do iterative DNS queries work?
An iterative DNS query is a request for a website name or uniform resource locator (URL) that the domain name system (DNS) server responds to with the IP address from its zone file cache, if possible. If the server doesn’t have the IP address requested, it forwards the request on to another DNS server.
What types of DNS queries available?
There are three types of queries in the DNS system:
- Recursive Query.
- Iterative Query.
- Non-Recursive Query.
- DNS Resolver.
- DNS Root Server.
- Authoritative DNS Server.
What DNS queries?
A DNS query (also known as a DNS request) is a demand for information sent from a user’s computer (DNS client) to a DNS server. In most cases a DNS request is sent, to ask for the IP address associated with a domain name.
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 are the three 3 types of DNS queries?
What triggers a DNS query?
Normally a DNS Query is a request sent from a DNS Client to a DNS Server, asking for the IP Address related with a Fully Qualified Domain Name (FQDN). When a DNS Client needs to find the IP Address of a computer known by its Fully Qualified Domain Name (FQDN), it queries DNS servers to get the IP Address.
What do TLD DNS servers do?
A TLD nameserver maintains information for all the domain names that share a common domain extension, such as .com, . net, or whatever comes after the last dot in a url. For example, a .com TLD nameserver contains information for every website that ends in ‘.com’.
What is recursive DNS server?
A recursive DNS server is a domain name system server that takes website name or URL (uniform resource locator) requests from users and checks the records attained from authoritative DNS servers for the associated IP address.