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Difficulty: MediumDNS Infrastructure and Record Types

Match each DNS resource record type on the left with its corresponding technical function or usage scenario on the right.

  • SRV RecordDefines service location parameters, including hostname, port number, priority, and weight for specific network protocols.
  • PTR RecordMaps an IP address to a canonical hostname to facilitate reverse name resolution.
  • SOA RecordSpecifies core zone administration parameters, including the primary master name server, administrator email, and zone transfer timers.
  • CNAME RecordMaps an alias domain name to an existing canonical domain name rather than directly to an IP address.

Answer

SRV record matches service location parameters (hostname, port, priority, weight); PTR record matches reverse IP-to-hostname mapping; SOA record matches zone administration metadata and timers; CNAME record matches domain alias-to-canonical name mapping.
Each DNS record type has a dedicated function within network infrastructure: SRV specifies service locators and ports; PTR provides reverse name lookup; SOA provides zone administrative metadata and serial numbers; CNAME aliases hostnames to target canonical domain names.

Step-by-Step Solution

1
Identify the record type designed to locate specific network services and ports.
Match the SRV record to the description detailing hostname, port, priority, and weight parameters.
SRV records are unique in providing both service port and target hostname along with load-balancing parameters.
2
Identify the record type used for reverse name resolution.
Match the PTR record to the description mapping IP addresses back to canonical hostnames.
PTR records reside in reverse lookup zones (in-addr.arpa or ip6.arpa) to fulfill reverse queries.
3
Identify the record that establishes authority and zone transfer properties for a DNS zone.
Match the SOA record to the description containing primary master server metadata, contact email, and zone timers.
The SOA record mandatory header marks the beginning of authority for every DNS zone file.
4
Identify the record type that creates an alias to an existing domain name.
Match the CNAME record to the description aliasing one domain name to a canonical domain name.
CNAME records redirect DNS queries for an alias directly to another hostname.

Key Concept

DNS Resource Record Types and Technical Functions
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Topics

DNS Infrastructure and Record Types

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