A network administrator is auditing enterprise DNS configurations. Match each DNS resource record type on the left with its correct functional description on the right.
- CNAME RecordMaps an alias domain name to a canonical domain name rather than directly to an IP address.
- MX RecordSpecifies the mail servers responsible for accepting incoming email messages on behalf of a domain, including priority values.
- SRV RecordDefines the hostname, port number, priority, and weight for specific directory or communication services such as LDAP or SIP.
- PTR RecordMaps an IP address back to a fully qualified domain name (FQDN) to enable reverse DNS lookups.
Answer
CNAME matches the alias-to-canonical domain description; MX matches the mail server routing description; SRV matches the service location (hostname, port, priority, weight) description; PTR matches the IP address-to-FQDN reverse lookup description.
Each DNS resource record fulfills a distinct network role: CNAME creates domain aliases; MX routes domain mail to designated email servers; SRV locates specific network services along with port and priority parameters; PTR performs reverse DNS lookups mapping IP addresses back to domain names.
Step-by-Step Solution
Key Concept
DNS Resource Record Functions and Infrastructure Roles