Which DNS record creates an alias from one domain name to another?

Which DNS record creates an alias from one domain name to another?

• A. CNAME
• B. A
• C. AAAA
• D. MX

Answer: (A)

A DNS CNAME record creates an alias by pointing one domain name to another domain name. When a resolver looks up the alias, it follows the CNAME to the target domain and continues the lookup there, effectively making multiple names refer to the same resource without needing separate IP-based records for each name. This is different from A records, which map a name directly to an IPv4 address, or AAAA records for IPv6 addresses, and MX records, which designate the mail server for the domain. Note that a CNAME must point to another domain name (not an IP address) and is typically used to alias names rather than to host other types of records for the same name.

A DNS CNAME record creates an alias by pointing one domain name to another domain name. When a resolver looks up the alias, it follows the CNAME to the target domain and continues the lookup there, effectively making multiple names refer to the same resource without needing separate IP-based records for each name. This is different from A records, which map a name directly to an IPv4 address, or AAAA records for IPv6 addresses, and MX records, which designate the mail server for the domain. Note that a CNAME must point to another domain name (not an IP address) and is typically used to alias names rather than to host other types of records for the same name.