An enterprise network administrator is auditing the organization's external DNS zone files and service discovery settings. Match each DNS resource record type on the left with its correct primary technical function or scenario application on the right.
- SRV RecordSpecifies hostname, port number, priority, and weight for specialized service discovery such as SIP or LDAP.
- PTR RecordMaps an IP address to a canonical hostname for reverse DNS queries and anti-spam validation.
- SOA RecordDefines primary name server authority, zone serial numbers, and zone transfer refresh/retry timers.
- TXT RecordStores arbitrary text strings used for email authentication mechanisms such as SPF, DKIM, and DMARC.
Answer
The correct pairings link SRV records to service locator parameters (port, priority, weight), PTR records to reverse IP-to-hostname resolution, SOA records to zone authority and timing metadata, and TXT records to published email security key and policy strings.
Each DNS record type provides distinct functionality: SRV for service locator metadata with port and priority parameters; PTR for reverse IP address mapping; SOA for governing zone administrative metadata and transfer timing; and TXT for hosting email authentication policies like SPF and DKIM keys.
Step-by-Step Solution
Key Concept
DNS Resource Record Functions and Applications