DNS & Infrastructure
DNS resolution, record types, nameservers, and the protocols that power domain name lookups.
DNS (Hệ thống Tên Miền)
Hierarchical naming system that translates domain names into IP addresses.
Máy chủ tên miền (Nameserver)
Server that stores DNS records and responds to DNS queries for a domain zone.
Bản ghi A
DNS record mapping a domain name to an IPv4 address.
Bản ghi AAAA
DNS record mapping a domain name to an IPv6 address.
Bản ghi CNAME
DNS record that creates an alias from one domain name to another canonical name.
Bản ghi MX
DNS record specifying the mail server responsible for receiving email for a domain.
Bản ghi TXT
DNS record holding arbitrary text data, commonly used for email authentication and domain verification.
Bản ghi NS
DNS record that delegates a DNS zone to an authoritative nameserver.
Bộ phân giải DNS (DNS Resolver)
Software or service that performs recursive DNS lookups on behalf of clients.
Bộ nhớ đệm DNS (TTL)
Temporary storage of DNS query results with a Time-To-Live expiration.
Máy chủ DNS có thẩm quyền
Server that holds the original DNS records for a zone and provides definitive answers.
Tệp vùng DNS
Text file describing a DNS zone with records for all domains in that zone.
Bản ghi SOA
Start of Authority record containing administrative information about a DNS zone.
Tên miền con (Subdomain)
Domain that is part of a larger domain, created by prepending a label (e.g., blog.example.com).
Địa chỉ IP
Numerical label (IPv4 or IPv6) assigned to each device connected to a computer network.
DNS Resolver Đệ Quy
Server that performs the full DNS resolution chain on behalf of clients and caches results.
Máy Chủ Gốc DNS
Top-level nameservers that direct resolvers to the correct TLD nameservers.
Vùng DNS
Administrative partition of the DNS namespace managed by a single authoritative authority.
Bản Ghi PTR (DNS Ngược)
DNS record that maps an IP address back to a hostname for reverse DNS lookups.
Ủy Quyền 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 (Cơ Chế Mở Rộng DNS)
RFC 6891 extension to the DNS protocol enabling larger messages, DNSSEC, and new option codes.
Tấn Công Khuếch Đại DNS
DDoS technique exploiting open DNS resolvers to flood a victim with amplified response traffic.
Bộ Nhớ Cache Âm (NXDOMAIN)
Caching of NXDOMAIN and NODATA DNS responses to prevent repeated queries for non-existent names.