CodePudding user response:
CodePudding user response:
1. The domain is a domain name, URL is the URL, a full URL such as http://user:[email protected]:88/abc/index.html, it locate a particular resource, the host part can be a domain name can also be a IP (ipv4 or v6)2. The management of the domain name system had been NIC to domain management institutions, management of top-level domain names - & gt; The secondary domain name management is not the same person/organization bear,
3. The DNS from the top-level domain - & gt; The secondary domain - & gt; Level 3 domain... Top-down management
4. The organization pattern: com, org, edu... , the geographical model: cn. Hk. Jp. Tw...