312-50V10 · 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 DNS forward lookup zone file must contain specific resource records to establish authority and resolve names. The standard records are SOA, NS, A, and MX.
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)- B4% (1)
- D96% (27)
Why each option
A DNS forward lookup zone file must contain specific resource records to establish authority and resolve names. The standard records are SOA, NS, A, and MX.
'DNS' is not a valid resource record type, and AXFR is a zone transfer query mechanism used to replicate zone data between servers, not a record stored within a zone file.
'DNS' is not a valid resource record type; PTR records belong to reverse lookup zones and are not a standard component of forward lookup zone files.
AXFR is a DNS zone transfer request type (a query opcode), not a resource record that resides inside a zone file.
The SOA (Start of Authority) record is mandatory in every zone file and defines authoritative parameters such as the primary name server and TTL values. NS records identify authoritative name servers for the zone, A records map hostnames to IPv4 addresses, and MX records define mail routing - together these are the foundational resource records of a standard forward lookup zone file.
Concept tested: DNS zone file standard resource record types
Source: https://www.rfc-editor.org/rfc/rfc1035
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