Web server is not for DNS! This source explains why resolver & authoritative are the correct answers: https://www.cloudns.net/wiki/article/202/#:~:text=Authoritative%20DNS%20nameservers%20provide%20answers,etc%20for%20a%20domain%20name.
The two server types that support domain name to IP address resolution are:
Domain Name System (DNS) Servers: DNS servers are specialized servers responsible for translating human-readable domain names (like www.example.com) into IP addresses that computers use to identify each other on a network. DNS servers maintain a database of domain name to IP address mappings, allowing users to access websites and services using easy-to-remember domain names.
Dynamic Host Configuration Protocol (DHCP) Servers: While DHCP servers are primarily responsible for assigning IP addresses to devices on a network, they can also provide domain name resolution information to those devices. When a device connects to a network and obtains an IP address from a DHCP server, it can also receive DNS server information from the DHCP server. This DNS information allows the device to perform domain name to IP address resolution using the DNS server's capabilities.
What is DNS resolver?
DNS Resolvers are responsible for providing the correct IP address of a domain name to the requesting host. For example, if you make a request from your web browser and there is no information on your computer about this domain name (it is not cached), your computer will send the request to DNS resolvers. The resolver will then try to find the name servers, that are responsible for this domain name and contain the necessary records. These name servers are called authoritative.
What is authoritative name server?
Authoritative DNS nameservers provide answers to DNS resolvers with the correct IP addresses and records. These name servers contain the DNS zone with all information, like the IP address of the server, the responsible mail servers, etc for a domain name.
Both servers work hand in hand - resolvers ask the authoritative name servers. They cannot be used for different purposes - e.g. authoritative name server cannot be used as DNS resolver or vice versa.
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