DNS (Domain Name System)
The Domain Name System (DNS) translates human-readable domain names like example.com into the IP addresses computers use to connect.
DNS is the internet's address book. Every request starts with a DNS lookup; if it fails or returns the wrong record, users cannot reach your site even when the server itself is healthy. DNS problems are a common, hard-to-spot cause of outages.
Monitoring DNS records (A, AAAA, MX, TXT, and more) catches misconfigurations, hijacks, and propagation issues before they take you offline.
Related terms
TTFB (Time To First Byte)Time To First Byte (TTFB) is the time between making a request and receiving the first byte of the response.DNSBL / RBL (Blocklist)A DNSBL (DNS-based Blocklist), also called an RBL, is a published list of IP addresses or domains flagged for sending spam or malicious traffic.SSL/TLS CertificateAn SSL/TLS certificate is a digital credential that enables encrypted HTTPS connections and proves a site owns its domain.
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