Which DNS record provides for domain name aliases within your zone?

Which DNS record provides for domain name aliases within your zone?

• A. CNAME (Canonical Name)
• B. A (Address)
• C. MX (Mail Exchange)
• D. PTR (Pointer)

Answer: (A)

A DNS alias is a name that points to another domain name rather than directly to an IP address. The CNAME (Canonical Name) record is specifically used to create those aliases within your zone. When a resolver encounters a CNAME, it follows the alias to the canonical name and then looks up the IP from that canonical name’s A (or AAAA) record. This lets multiple domain names share one canonical host, so you can change the underlying address in one place without updating every alias. For example, you can set a CNAME so that www.example.com is an alias of example.com. When someone resolves www.example.com, the DNS system retrieves the A record for example.com to get the IP, keeping the mapping centralized. Remember that a CNAME must point to another domain name, not an IP address, and the alias name generally shouldn’t have other records of its own in the same zone. Other record types serve different roles, such as mapping a hostname directly to an IP with an A record, handling mail servers with MX, or reverse lookups with PTR.

A DNS alias is a name that points to another domain name rather than directly to an IP address. The CNAME (Canonical Name) record is specifically used to create those aliases within your zone. When a resolver encounters a CNAME, it follows the alias to the canonical name and then looks up the IP from that canonical name’s A (or AAAA) record. This lets multiple domain names share one canonical host, so you can change the underlying address in one place without updating every alias.

For example, you can set a CNAME so that www.example.com is an alias of example.com. When someone resolves www.example.com, the DNS system retrieves the A record for example.com to get the IP, keeping the mapping centralized. Remember that a CNAME must point to another domain name, not an IP address, and the alias name generally shouldn’t have other records of its own in the same zone. Other record types serve different roles, such as mapping a hostname directly to an IP with an A record, handling mail servers with MX, or reverse lookups with PTR.