For example, FQDN: (Fully Qualified Domain Name) fully qualified domain name: a name with both a host name and a domain name. The combination of the host name and the domain name constitutes the FQDN, and the host name is the leftmost part of the FQDN. Host: The host name is at the bottom of the domain name space structure. Use two characters, such as: cn -> for China, jp -> Japan, uk -> United Kingdom, hk -> Hong Kong and so on. Second-level domain: The registered name used by an individual or organization on the Internet. Use three characters, such as com -> commercial companies, edu -> educational institutions, net -> Internet companies, gov -> non-military government agencies, and so on. Top-level domain: used to indicate a country, region or organization. Root domain: In the use of DNS domain names, it is stipulated that the trailing period ‘.’ is used to specify the domain hierarchy whose name is at the root or a higher level. The names in the DNS database form a hierarchical tree structure called a domain namespace. The Domain Name System acts as a hierarchical and distributed database that contains various types of data, including hostnames and domain names. When port 53 of the computer uses TCP/UDP domain name request query, if the data packet is less than 512 bytes, UDP is used if the returned request size is greater than 512 bytes, the two sides of the interaction will negotiate to use TCP. The job of converting domain names to IP addresses. It is a computer and network service naming system organized into a domain hierarchy. DNS (Domain Name System) is the English abbreviation of “Domain Name System”.
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