https://www.bilibili.com/video/BV19E411D78Q?p=70
www.cskaoyan .com
www level domain
cskaoyan secondary domain name
com top-level domain
root
Top-level domain:
- National entry-level domain: cn, us, uk
- Generic top-level domains: com, net, org, gov, int, aero, museum, travel
- Infrastructure domain / reverse domain name: arpa
secondary domain:
- Type the domain name: ac, com, edu, goy, mil, net, org
- Administrative domain: for China's provinces, autonomous regions and municipalities bj, js
Three domain names:.. Www.pku edx com [which pku is the third-level domain]
four domain:
The domain tree:
Is a screenshot: [domain name server]
Domain name resolution process:
https://blog.csdn.net/weixin_42061048/article/details/80170991
(1) recursive query: [by others] is a party hand
recursive query is a query mode, a type of DNS server receives DNS server in this mode to the client requests, you must use an accurate reply to the client query results. If the DNS server queries DNS information is not stored locally, then the server will ask other servers, and submit query results returned to the client.
(2) iterative query: [on their own] is own by the client to query
DNS server query to another iterative query, the DNS server will provide additional able to resolve queries a DNS server address to the client, when the client sends a query when requested, the DNS server does not respond directly to query results, but to tell the client to another DNS server address, the client again submit this request to the DNS server, followed by cycle until the return query results.
The introduction of the cache on the local domain name server [], it can greatly reduce the time domain analysis.
Probably two days automatic updates.
