Which command is used to perform a DNS lookup for a domain's A record?

Which command is used to perform a DNS lookup for a domain's A record?

• A. Nslookup
• B. Dig
• C. Ping
• D. Host command

Answer: (D)

The key idea is using a DNS lookup tool that is specifically suited to querying DNS records. The host command is designed for quick DNS lookups and returns straightforward information about a domain’s A records, i.e., the IPv4 addresses associated with that domain. For example, running host example.com will output the domain and its IPv4 address, like “example.com has address 93.184.216.34.” This direct, focused behavior makes it ideal for quickly obtaining A records. Other tools can perform similar lookups but serve broader purposes. Nslookup and dig are versatile DNS debugging tools with more options and output formats, which is useful in complex scenarios. Ping, on the other hand, is a connectivity tool; it resolves a domain to an IP only as a means to test reachability, not to query or display DNS records themselves. So for a straightforward A record lookup, the host command fits best.

The key idea is using a DNS lookup tool that is specifically suited to querying DNS records. The host command is designed for quick DNS lookups and returns straightforward information about a domain’s A records, i.e., the IPv4 addresses associated with that domain. For example, running host example.com will output the domain and its IPv4 address, like “example.com has address 93.184.216.34.” This direct, focused behavior makes it ideal for quickly obtaining A records.

Other tools can perform similar lookups but serve broader purposes. Nslookup and dig are versatile DNS debugging tools with more options and output formats, which is useful in complex scenarios. Ping, on the other hand, is a connectivity tool; it resolves a domain to an IP only as a means to test reachability, not to query or display DNS records themselves. So for a straightforward A record lookup, the host command fits best.