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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.
Subnet
A logical division of an IP network into smaller segments to improve performance, security, and management.
TCP vs UDP
Two transport layer protocols: TCP provides reliable, ordered delivery while UDP provides fast, connectionless delivery without guarantees.
HTTPS Everywhere
The practice of securing all web traffic with TLS encryption, ensuring data integrity and privacy between browsers and servers.
DNS Record Types
Different types of DNS entries that map domain names to various information like IP addresses, mail servers, and verification strings.
Content Delivery Network (CDN)
A geographically distributed network of servers that caches and delivers web content from locations closest to users for faster load times.
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