1. What is the domain name system?
Domain Name System (DNS) is a system that solves online machine naming on the Internet.
Just like when visiting a friend, you must first know how others go, when a host wants to access another host on the Internet, you must first know its address. The IP address in TCP/IP is composed of four numbers separated by "". It is always not as convenient as the name. Therefore, a domain name system is used to manage the correspondence between the name and the IP.
2. Structure and operation of Internet domain name system
The Internet domain name system is a tree structure, its form is as follows:
com (enterprise), com (enterprise), com (enterprise), ed u (education) fields are managed by InterNic, and its registration and operation work is currently under the responsibility of Network Solution.
The 7 new top-level domains are:
firm (company), shop (shop), web (entities that hope to highlight World Wide Web activities), arts (entities that mainly engage in entertainment and cultural activities), rec (entities that mainly engage in entertainment and cultural entities), info (entities that mainly engage in information service entities), and nom (some people who hope to publish personal information on the Internet) will be launched in 1998. The registration services for these domain names are undertaken by many institutions, and CNNIC is also fortunate to become one of the registration institutions;
National domain names formulated in accordance with ISO-3166 standards are generally operated by the NIC (Network Information Center) of each country.
my country's domain name system is divided into two sets of category domain names and administrative region names.
Category domain names refer to the six domain names in the front of the bottom line in the figure, and are divided into: A
C-Scientific research institutions; COM-English majors such as industry, business, finance, etc.; EDU-Educational institutions; GOV-Government departments; NET-Mutual
Information center and operation center for connecting networks, access networks; ORG - various non-profit organizations.
The administrative region names are divided according to the various administrative regions in my country. The division standards are determined according to the national standards issued by the State Administration of Technology. They include 34 "administrative region names", which are applicable to all provinces, autonomous regions and municipalities in my country, namely: BJ-Beijing; SH-Shanghai; TJ-Tianjin; CQ-Chongqing; HE-Hebei Province; SX-Shanxi Province; NM-Inner * Autonomous Region; LN-Liaoning Province; JL-Jilin Province; HL-Heilongjiang Province; JS-Jiangsu Province; ZJ-Zhejiang Province; AH-Anhui; FJ-Fujian Province; JX-Jiangxi Province; SD-Shandong Province; HA-Henan Province; HB-Hubei Province; HN-Hunan Province; GD-Guangdong Province; GX-
Guangxi Zhuang Autonomous Region; HI-Hainan Province; SC-Sichuan Province; GZ-Guizhou Province; YN-Yunnan Province; XZ-Tibet Autonomous Region; SN-Shaanxi Province; GS-Gansu Province; QH-Qinghai Province; NX-Ningxia Hui Autonomous Region; XJ-* Uygur Autonomous Region; TW-*; HK-*; MO-Macao.
Except for educn, the CN domain name is run by CNNIC (Education Network).
3. What is domain name analysis?
Just like when we first visit someone, we need to know the house number and then look for it according to the address. It is not enough to only know the domain name of a certain machine on the Internet, and there is also a way to find that machine. The task of finding this machine is completed by a device called a domain name server on the Internet, and the process of completing this task is called domain name resolution.
The process of domain name resolution is:
When a machine a issues a domain name resolution request to its domain name server A, if A can resolve, the resolution result is sent to a. Otherwise, A will issue a resolution request to its superior domain name server B. If B can resolve, the resolution result is sent to a. If B cannot resolve, the request is sent to another previous level domain name server C... This continues until the resolution is completed.
Article entry: dnbm Editor: dnbm