DNS & Infrastructure
DNS resolution, record types, nameservers, and the protocols that power domain name lookups.
DNS (Sistema de Nombres de Dominio)
Hierarchical naming system that translates domain names into IP addresses.
Servidor de Nombres (Nameserver)
Server that stores DNS records and responds to DNS queries for a domain zone.
Registro A
DNS record mapping a domain name to an IPv4 address.
Registro AAAA
DNS record mapping a domain name to an IPv6 address.
Registro CNAME
DNS record that creates an alias from one domain name to another canonical name.
Registro MX
DNS record specifying the mail server responsible for receiving email for a domain.
Registro TXT
DNS record holding arbitrary text data, commonly used for email authentication and domain verification.
Registro NS
DNS record that delegates a DNS zone to an authoritative nameserver.
Resolución DNS (DNS Resolver)
Software or service that performs recursive DNS lookups on behalf of clients.
Caché DNS (TTL)
Temporary storage of DNS query results with a Time-To-Live expiration.
Servidor DNS Autoritativo
Server that holds the original DNS records for a zone and provides definitive answers.
Archivo de Zona DNS
Text file describing a DNS zone with records for all domains in that zone.
Registro SOA
Start of Authority record containing administrative information about a DNS zone.
Subdominio
Domain that is part of a larger domain, created by prepending a label (e.g., blog.example.com).
Dirección IP
Numerical label (IPv4 or IPv6) assigned to each device connected to a computer network.
Resolver DNS Recursivo
Server that performs the full DNS resolution chain on behalf of clients and caches results.
Servidor Raíz DNS
Top-level nameservers that direct resolvers to the correct TLD nameservers.
Zona DNS
Administrative partition of the DNS namespace managed by a single authoritative authority.
Registro PTR (DNS Inverso)
DNS record that maps an IP address back to a hostname for reverse DNS lookups.
Delegación DNS
Transfer of DNS authority for a child zone to designated nameservers via NS records.
DNS Round Robin
Load-balancing technique using multiple IP addresses on a single hostname to distribute traffic.
DNS Sinkhole
DNS configuration that redirects malicious domains to a controlled IP to block or analyze threats.
EDNS (Mecanismos de Extensión para DNS)
RFC 6891 extension to the DNS protocol enabling larger messages, DNSSEC, and new option codes.
Ataque de Amplificación DNS
DDoS technique exploiting open DNS resolvers to flood a victim with amplified response traffic.
Caché Negativo (NXDOMAIN)
Caching of NXDOMAIN and NODATA DNS responses to prevent repeated queries for non-existent names.