术语 #
| Full Name | Short Name | Meaning |
|---|---|---|
| Top-Level Domains | TLD | |
| Second-Level Domains | SLD | |
| Generic Top-Level Domains | gTLD | .com, .edu, .net, .org, .mil, and so on |
| Country Code Top-Level Domains | ccTLD | .us, .ca, .tv, .uk, and so on |
| Fully Qualified Domain Names | FQDN | www.us.example.com |
Zone #
the owner can delegate, in any way they want, anything to the left of the domain name they own (or were delegated). The delegated owner is also responsible for administering this delegation. The unit of delegation is referred to as a zone in the DNS specifications.
域名所有者能将域名所剩部分以任何形式代理给他人。但代理关系本身由域名所有者来管理。代理的单位是zone。
DNS的循环工作（round-robin）模式 DNS放大攻击 递归查询与迭代查询(DNS)