A DNS server is considered recursive when it responds to queries from clients by retrieving additional information from the authoritative DNS server for the domain name specified by the client. Recursive DNS servers are important for two reasons: first, they allow clients to resolve domain names to IP addresses; and second, they can help prevent the occurrence of name resolution problems.
A recursive DNS server can be helpful in resolving domain names to IP addresses because it can query the authoritative DNS server for the domain name specified by the client. The recursive DNS server can then use the information it retrieves from the authoritative DNS server to answer the query from the client. This process helps to prevent the occurrence of name resolution problems.
Name resolution problems can occur when a client is unable to find the correct DNS server to resolve a domain name. The recursive DNS server can help to resolve the name by querying the authoritative DNS server again.
