200-301 · Question #256
What is the authoritative source for an address lookup?
The correct answer is A. a recursive DNS search. The authoritative source for an address lookup is ultimately an authoritative DNS server, which is reached through a recursive DNS search process initiated by a client's resolver.
Question
What is the authoritative source for an address lookup?
Options
- Aa recursive DNS search
- Bthe operating system cache
- Cthe ISP local cache
- Dthe browser cache
How the community answered
(36 responses)- A89% (32)
- B6% (2)
- C3% (1)
- D3% (1)
Why each option
The authoritative source for an address lookup is ultimately an authoritative DNS server, which is reached through a recursive DNS search process initiated by a client's resolver.
A recursive DNS search involves a DNS resolver querying a hierarchy of DNS servers (root, TLD, then authoritative) until it reaches the authoritative name server. This authoritative server holds the definitive, original DNS records for a domain.
The operating system cache stores previously resolved DNS entries locally for speed but is not the authoritative source of the original record.
The ISP local cache (recursive DNS server cache) stores recently resolved queries to improve response times but is not the authoritative source for the DNS records themselves.
The browser cache stores web content and potentially DNS resolutions for faster page loading but is not the authoritative source for DNS information.
Concept tested: DNS authoritative source
Source: https://learn.microsoft.com/en-us/windows-server/networking/dns/understand/understanding-dns-servers
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