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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

VPN (Virtual Private Network)
A technology that creates an encrypted tunnel between your device and a remote server, securing internet traffic.
HTTP/HTTPS
The protocol used for transferring web pages and data between browsers and servers, with HTTPS adding encryption.
HTTPS Everywhere
The practice of securing all web traffic with TLS encryption, ensuring data integrity and privacy between browsers and servers.
ICMP (Internet Control Message Protocol)
A network protocol used for diagnostic and error reporting, including ping and traceroute functionality.
SNMP (Simple Network Management Protocol)
A protocol for monitoring and managing network devices like routers, switches, servers, and printers remotely.
Network Topology
The physical or logical arrangement of nodes and connections in a computer network, such as star, mesh, ring, or bus configurations.
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