Domain Name Service
Terminology 1
hosts file (old)
position of the different systems of
Windows
C: \ Windows \ System32 \ the Drivers \ etc \ hosts
need super administrator privileges
Linux
/ etc / hosts
effect: achieve name resolution, mainly for the local host name, cluster nodes to provide fast analytical
database: planar structure, centralized database
Cons: not easy to query, update
the DNS
(domain system the name, domain name system) DNS
role: implement name resolution (for example, resolve host names to IP)
(distributed, hierarchical of)
the FQDN of the
the FQDN of the: (fully qualified! the name domain) fully qualified domain name / full name of the domain name
. baidu.com
. www.baidu.com
. www.music.baidu.com
www.icbc.com.cn.
. hostname four domains. ... three top-level domain domain two domain (root domain)
namespace
namespace name space: a mechanism for a host name on the Internet
spatial classification
Terminology 2
client (recursive queries) local DNS
DNS server (iterative query) DNS server
server type
master server
from the server
cache servers
analytical positive / reverse resolution
DNS service primarily serves two purposes:
1) can be corresponding DNS for the corresponding IP address, called forward resolution.
2) can correspond to resolve IP addresses to corresponding domain, called reverse analysis. (Anti-spam)
