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Networking Intermediate

What is DNS over HTTPS (DoH)?

A protocol that encrypts DNS queries by sending them over HTTPS, preventing eavesdropping and manipulation of DNS traffic.

Traditional DNS sends queries in plaintext, allowing ISPs, network operators, and attackers to see and potentially modify what domains users resolve. DNS over HTTPS encrypts these queries within standard HTTPS traffic on port 443, making them indistinguishable from regular web traffic. Major browsers (Firefox, Chrome) and operating systems support DoH. Public resolvers like Cloudflare (1.1.1.1) and Google (8.8.8.8) offer DoH endpoints. While DoH improves privacy, critics note it centralizes DNS resolution with a few large providers and can complicate enterprise network security monitoring.

Related Terms

Bandwidth
The maximum rate of data transfer across a network connection, measured in bits per second.
Reverse Proxy
A server that sits between clients and backend servers, forwarding client requests and returning server responses on their behalf.
DNS (Domain Name System)
A hierarchical naming system that translates human-readable domain names into IP addresses.
IP Address
A unique numerical label assigned to each device on a computer network for identification and communication.
Load Balancer
A device or software that distributes network traffic across multiple servers to ensure reliability and performance.
HTTP Keep-Alive
An HTTP mechanism that reuses a single TCP connection for multiple requests, reducing the overhead of establishing new connections.
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