DNS Glossary

Understand the domain name system and its records.

DNS (Domain Name System) is the web's phonebook, translating domain names to IP addresses. Understanding how it works is essential for managing your infrastructure.

This glossary covers essential DNS concepts, from basic records to advanced features like DNSSEC.

seo.glossaire_dns.basics_title

DNS (Domain Name System) - DNS (Domain Name System)
Domain Name - seo.glossaire_dns.term_domain
Nameserver (NS) - NS (Name Server)
Resolver - DNS Resolver

seo.glossaire_dns.records_title

A Record - A (Address)
AAAA Record - AAAA (Quad-A)
CNAME Record - CNAME (Canonical Name)
MX Record - MX (Mail Exchanger)
TXT Record - TXT (Text)
PTR Record - PTR (Pointer)
SRV Record - SRV (Service)
CAA Record - CAA (Certification Authority Authorization)

seo.glossaire_dns.email_title

SPF (Sender Policy Framework) - SPF (Sender Policy Framework)
DKIM (DomainKeys Identified Mail) - DKIM (DomainKeys Identified Mail)
DMARC - DMARC

seo.glossaire_dns.technical_title

TTL (Time To Live) - TTL (Time To Live)
Propagation - DNS Propagation
DNSSEC - DNSSEC
DoH (DNS over HTTPS) - DoH (DNS over HTTPS)

Frequently Asked Questions

How long for DNS propagation?

Depends on previous TTL. Generally 24-48h to be sure, but often a few hours if TTL was short.

A or CNAME, which to use?

A to point to a fixed IP. CNAME to point to another domain (CDN, PaaS). Never CNAME on apex (root).

What is optimal TTL?

300s (5min) for records that may change. 86400s (24h) for stable records.

How to check DNS propagation?

Use tools like whatsmydns.net that query resolvers in different regions.

Is DNSSEC necessary?

Recommended for security, but not yet mandatory. Protects against DNS poisoning.

Why aren't my DNS changes visible?

Caching. Wait for TTL expiration or flush your local DNS cache.

Master Your DNS

DNS is the foundation of your web presence. Bad configuration can make your site unreachable or compromise your emails.

MoniTao can monitor your critical DNS records and alert you to any changes. Keep control of your DNS infrastructure.

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