What is the purpose of DNS over HTTPS (DoH)?

• A. To encrypt DNS queries and responses for privacy and security.
• B. To route DNS over a dedicated port for performance.
• C. To speed up DNS resolution by caching results.
• D. To publish DNS records as HTTP resources.

Answer: (A)

DNS over HTTPS aims to protect the privacy and integrity of DNS queries by carrying them inside HTTPS with TLS encryption. Because the DNS messages are encrypted, onlookers can’t easily see which domains you’re asking about or tamper with the responses as they travel across networks. That privacy and security benefit is the core reason for DoH.

It isn’t primarily about using a special port, speeding up lookups, or publishing DNS records as HTTP resources. DoH uses HTTPS (usually over standard ports like 443), so the traffic looks like regular web traffic rather than traditional DNS traffic. Caching and speed depend more on the resolver and network conditions than on the DoH transport itself, and publishing records as HTTP resources is not what DoH does.