Which DNS Query type is resolved to an IP address?

Interview
1

Q. Which DNS Query type is resolved to an IP address?

a) SRV Query Request
b) NAPTR Query Request
c) A Query Request
d) PTR Query Request

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:arrow_right: Correct answer: Letter c.

A Query Request is a DNS query used to directly resolve a hostname into an IPv4 address. In the VoLTE/IMS architecture, this is the final DNS resolution step that yields the actual IP address of a network entity (like P-CSCF, S-CSCF, etc.).

Q. Which DNS Query type is resolved to an IP address?

a) :x: SRV Query Request
→ Incorrect. SRV (Service) records return the hostname and port of servers that offer a specific service (like SIP over UDP). You still need to perform an A/AAAA query to get the IP.

b) :x: NAPTR Query Request
→ Incorrect. NAPTR (Naming Authority Pointer) records are used for dynamic service discovery, such as translating a SIP URI into a service endpoint. NAPTR typically leads to SRV or A/AAAA queries, but doesn’t resolve directly to IPs.

c) :white_check_mark: A Query Request
→ Correct. A records are the DNS record type that maps a fully qualified domain name (FQDN) directly to an IPv4 address — exactly what’s needed to establish an IP-level connection.

d) :x: PTR Query Request
→ Incorrect. PTR (Pointer) records are used in reverse DNS lookups, translating an IP address back into a hostname, not the other way around.