What term describes a method of requesting DNS mapping?

What term describes a method of requesting DNS mapping?

• A. Iterative DNS Query
• B. Recursive DNS Query
• C. DNSSEC Lookup
• D. NXDOMAIN Query

Answer: (B)

Recursive DNS query is the method where the client asks a DNS resolver to resolve a name completely. You hand the resolution task to your resolver, and it takes on the work of querying the root servers, then the top-level domain servers, and finally the authoritative servers until it finds the exact IP address (or an error) and returns that result to you. This gives you a single, final answer without needing to perform multiple steps yourself. An iterative query, by contrast, would return referrals to other servers and require you to continue querying those servers step by step. DNSSEC lookup is about validating the integrity of DNS data with digital signatures, not the request method. NXDOMAIN indicates that the requested domain does not exist, not how the resolution is performed.

Recursive DNS query is the method where the client asks a DNS resolver to resolve a name completely. You hand the resolution task to your resolver, and it takes on the work of querying the root servers, then the top-level domain servers, and finally the authoritative servers until it finds the exact IP address (or an error) and returns that result to you. This gives you a single, final answer without needing to perform multiple steps yourself.

An iterative query, by contrast, would return referrals to other servers and require you to continue querying those servers step by step. DNSSEC lookup is about validating the integrity of DNS data with digital signatures, not the request method. NXDOMAIN indicates that the requested domain does not exist, not how the resolution is performed.