DNS概述
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正向查找区域用于FQDN到IP地址的映射,当DNS客户端请求解析某个FQDN时,DNS服务器在正向查找区域中进行查找,并返回给DNS客户端对
1.对于属于所管理的主要区域和辅助区域的解析,DNS服务器向DNS客户端执行权威答复。
What Are Primary and Secondary Name Servers?
The primary name server is the first server used for information about a domain as well as the location of resources associated with a domain. The information stored on the primary and secondary name servers is exactly the same. The primary server acts as the master of information control while the secondary name server periodically copies primary server information. The way that the two interact can be explained in the following scenario: You want to find a movie in a rental store and you need to ask someone where to find it. You look to the nearest employee but they are very busy. You find a second employee who is not so busy and they are able to direct you much more quickly. The secondary name server is like a back up system to the primary name server in case the primary server is too busy or is not able to give a response. It has become common Internet protocol to require 2 name servers for each domain. It's always good to have a backup!
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