Which two security measures use certificates for authentication of DNS servers?

DNSSEC (Domain Name System Security Extensions) and TSIG (Transaction Signature) utilize certificates for the authentication of DNS servers, making this the correct answer.

DNSSEC is designed to protect the integrity of DNS data by using digital signatures to ensure that responses to DNS queries have not been tampered with. It authenticates the source of DNS responses and provides assurance that the responses are genuine, preventing attacks like DNS spoofing.

TSIG, on the other hand, is used for securing zone transfers and dynamic updates between DNS servers. It also uses shared keys and signatures to verify the authenticity of DNS messages, offering additional security for the communications between servers.

Both of these protocols directly rely on cryptographic mechanisms and certificates to ensure the authenticity and integrity of the DNS data being exchanged, which highlights their role in enhancing DNS security. Other options such as SSL, TLS, VPN, SSH, HTTP, and HTTPS do involve encryption and security, but they are not specifically designed for the DNS authentication process.