What type of records must be present for proper functioning of an Active Directory domain?

For proper functioning of an Active Directory domain, it is essential to have both A and AAAA records present in the DNS configuration.

A records (Address records) map hostnames to their corresponding IPv4 addresses. Since many services and applications that rely on Active Directory communicate over IPv4, these records are critical for ensuring that clients can resolve the domain controller's hostname to an active IP address.

AAAA records (Address records for IPv6) serve a similar purpose but are specifically for mapping hostnames to their corresponding IPv6 addresses. As the industry moves towards adopting IPv6, having these records is increasingly important for compatibility and future-proofing the network infrastructure.

Together, A and AAAA records ensure that clients can properly communicate with domain controllers regardless of whether they are using IPv4 or IPv6, thus maintaining the functionality of the Active Directory domain.