Linux the second question was no

CodePudding user response:

DNS principle
1) the user to access www.baidu.com, query first client cache
A. the browser cache
B. the local host file
C. local Settings of the DNS server (LDNS)
2) occurred LDNS requests to the root domain name server root, root domain name server returns a domain of top-level domain name server (e.g. Cn)
3) LDNS sends a request to the top-level domain name server GTLD, top-level domain name lookup and returns the domain name corresponds to the primary domain name server address
4) LDNS sends a request to the main domain name server), according to the mapping table to find the main domain name server directory IP, returned to the LDNS
5) LDNS cache the domain name and the corresponding IP, and the analytical results back to the user, the user according to the TTL value to the local cache system cache, domain name resolution process is over

CodePudding user response:

reference 1st floor yolyry response:

DNS principle1) the user to access www.baidu.com, query first client cache
A. the browser cache
B. the local host file
C. local Settings of the DNS server (LDNS)
2) occurred LDNS requests to the root domain name server root, root domain name server returns a domain of top-level domain name server (e.g. Cn)
3) LDNS sends a request to the top-level domain name server GTLD, top-level domain name lookup and returns the domain name corresponds to the primary domain name server address
4) LDNS sends a request to the main domain name server), according to the mapping table to find the main domain name server directory IP, returned to the LDNS
5) LDNS cache the domain name and the corresponding IP, and the analytical results back to the user, the user according to the TTL value to the local cache system cache, domain name resolution process end

thanks brother