The reason that there are separate IPv4 A record and IPv6 AAAA record DNS queries is that early IPv6 deployments occasionally encountered problems with older IPv4-only resolvers. And today, frankly, all hosts are dual-protocol bilingual and can use either IP version (4 or 6) for their DNS traffic or for the DNS queries and responses contained within. One aspect of dual-protocol behavior that often surprises peoples is that hosts send two separate DNS queries to their resolver. The method that networked devices use to find their way around the digital ocean is the Domain Name System (DNS), which translates human-readable host and domain names into numerical IP addresses (and vice versa). Thankfully, navigating the Internet is not as daunting. Imagine what it was like to be an ancient mariner navigating the ocean blue at night using nothing more than stars, a sextant and a marine chronometer.
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