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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

Subnet
A logical division of an IP network into smaller segments to improve performance, security, and management.
Network Segmentation
The practice of dividing a network into isolated segments to improve security, performance, and management.
Firewall
A network security system that monitors and controls incoming and outgoing traffic based on predetermined rules.
DNS (Domain Name System)
A hierarchical naming system that translates human-readable domain names into IP addresses.
TCP vs UDP
Two transport layer protocols: TCP provides reliable, ordered delivery while UDP provides fast, connectionless delivery without guarantees.
Reverse Proxy
A server that sits between clients and backend servers, forwarding client requests and returning server responses on their behalf.
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