DNS & Infrastructure
DNS resolution, record types, nameservers, and the protocols that power domain name lookups.
DNS（域名系统）
Hierarchical naming system that translates domain names into IP addresses.
域名服务器
Server that stores DNS records and responds to DNS queries for a domain zone.
A 记录
DNS record mapping a domain name to an IPv4 address.
AAAA 记录
DNS record mapping a domain name to an IPv6 address.
CNAME 记录
DNS record that creates an alias from one domain name to another canonical name.
MX 记录
DNS record specifying the mail server responsible for receiving email for a domain.
TXT 记录
DNS record holding arbitrary text data, commonly used for email authentication and domain verification.
NS 记录
DNS record that delegates a DNS zone to an authoritative nameserver.
DNS 解析器
Software or service that performs recursive DNS lookups on behalf of clients.
DNS 缓存（TTL）
Temporary storage of DNS query results with a Time-To-Live expiration.
权威 DNS 服务器
Server that holds the original DNS records for a zone and provides definitive answers.
DNS 区域文件
Text file describing a DNS zone with records for all domains in that zone.
SOA 记录
Start of Authority record containing administrative information about a DNS zone.
子域名
Domain that is part of a larger domain, created by prepending a label (e.g., blog.example.com).
IP 地址
Numerical label (IPv4 or IPv6) assigned to each device connected to a computer network.
递归DNS解析器
Server that performs the full DNS resolution chain on behalf of clients and caches results.
DNS根服务器
Top-level nameservers that direct resolvers to the correct TLD nameservers.
DNS区域
Administrative partition of the DNS namespace managed by a single authoritative authority.
PTR记录（反向DNS）
DNS record that maps an IP address back to a hostname for reverse DNS lookups.
DNS委派
Transfer of DNS authority for a child zone to designated nameservers via NS records.
DNS轮询
Load-balancing technique using multiple IP addresses on a single hostname to distribute traffic.
DNS沉洞
DNS configuration that redirects malicious domains to a controlled IP to block or analyze threats.
EDNS（DNS扩展机制）
RFC 6891 extension to the DNS protocol enabling larger messages, DNSSEC, and new option codes.
DNS放大攻击
DDoS technique exploiting open DNS resolvers to flood a victim with amplified response traffic.
否定缓存（NXDOMAIN）
Caching of NXDOMAIN and NODATA DNS responses to prevent repeated queries for non-existent names.