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功能:将域名转为IP

工作模式:一般接受到请求后,先会到浏览器上查询缓存,如果没有就在本地的操作系统查询缓存,接着就是hosts文件,LDNS,一级二级三级域名,层层往上,最后才是根。

名次解释:。代表根域名,com是顶级域名,也叫一级域名,Baidu.com是二级域名,www.baidu.com是三级域名,以此类推。

DNS:对请求给予可靠的回答。DNS中存储的内容主要有三种类型:

a(记录域名和对应的IP)

NS记录(记录域名和负责解析该域名的权威DNS),

CNAME记录(负责记录域名和相应的别名)

本地DNS服务器,也称为l DNS,接受终端的域名查询请求,并负责在查询后向终端返回答案。

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