linux - 完全合格的域名是否需要句点？

Question

我对 FQDN(完全限定域名)感到困惑。 FQDN 是否需要以句号结尾？像 sun 或 sun.tuc.noao.edu. 或 sun.tuc.noao.edu。有什么区别？

Answer 1

How IT Works: Domain Name System

All DNS records actually end with the period character (.) which represents the root of the DNS hierarchy, but it's rarely printed and is usually just assumed. A domain name that includes the trailing period character is said to be a Fully Qualified Domain Name (FQDN). However, domain names where the period character is implicit are also commonly referred to as FQDNs.

^{Source: TechNet Magazine}

另见:

• Trailing Dots in Domain Names
• No, that dot in the domain name of the URL is not a mistake.