312-50V11 · Question #109
A zone file consists of which of the following Resource Records (RRs)?
The correct answer is D. SOA, NS, A, and MX records. A standard DNS zone file is built from SOA, NS, A, and MX resource records as defined in RFC 1035.
Question
A zone file consists of which of the following Resource Records (RRs)?
Options
- ADNS, NS, AXFR, and MX records
- BDNS, NS, PTR, and MX records
- CSOA, NS, AXFR, and MX records
- DSOA, NS, A, and MX records
How the community answered
(28 responses)- A4% (1)
- B4% (1)
- D93% (26)
Why each option
A standard DNS zone file is built from SOA, NS, A, and MX resource records as defined in RFC 1035.
DNS is not a valid resource record type; AXFR is a query type used to request zone transfers, not a record stored in a zone file.
DNS is not a valid resource record type, making this option incorrect regardless of the other entries.
AXFR is a zone transfer query mechanism, not a resource record type that exists within a zone file.
Every zone file must begin with an SOA (Start of Authority) record defining zone parameters, followed by NS (Name Server) records identifying authoritative servers, A records mapping hostnames to IPv4 addresses, and MX (Mail Exchange) records directing email. These four record types form the foundational structure of any valid zone file.
Concept tested: DNS zone file standard resource record types
Source: https://datatracker.ietf.org/doc/html/rfc1035
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