101 · Question #117
Which statement about root DNS servers is true?
The correct answer is B. Root servers have databases of the DNS servers for toplevel domains.. Root DNS servers are authoritative for the top-level domain (TLD) namespace, not for all domains globally. They direct resolvers to the appropriate TLD name servers.
Question
Which statement about root DNS servers is true?
Options
- ARoot servers have databases of all registered DNS servers.
- BRoot servers have databases of the DNS servers for toplevel domains.
- CRoot servers have databases of DNS servers for each geographical area. They direct requests to
- DRoot servers have databases of commonly accessed sites. They also cache entries for additional
How the community answered
(39 responses)- A3% (1)
- B95% (37)
- D3% (1)
Why each option
Root DNS servers are authoritative for the top-level domain (TLD) namespace, not for all domains globally. They direct resolvers to the appropriate TLD name servers.
Root servers do not maintain records of every registered DNS server globally - that would be an unmanageable and constantly changing dataset.
Root servers maintain a database of the authoritative name servers for each top-level domain such as .com, .org, and .net. When a resolver queries a root server, the root server responds with a referral to the correct TLD name server, which then directs the resolver further down the hierarchy toward the authoritative server for the queried domain.
Root servers are not organized by geographical area; they delegate by TLD namespace, not by geographic region.
Root servers do not cache commonly accessed sites - caching is a function of recursive resolvers, not root servers.
Concept tested: DNS root server hierarchy and TLD delegation
Source: https://www.iana.org/domains/root
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