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Update README.rst #26

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6 changes: 6 additions & 0 deletions README.rst
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Expand Up @@ -118,6 +118,12 @@ DNS 查询
* 查询本地 DNS 服务器
* 如果 DNS 服务器和我们的主机在同一个子网内，系统会按照下面的 ARP 过程对 DNS 服务器进行 ARP查询
* 如果 DNS 服务器和我们的主机在不同的子网，系统会按照下面的 ARP 过程对默认网关进行查询
* 从客户端到本地DNS服务器是属于递归查询，而本地DNS服务器与根域名服务器，顶级域名服务器，权威服务器之间是迭代查询。

- ``迭代查询``
在迭代查询中，如果所查询的 DNS 服务器与查询名称不匹配，则其将返回对较低级别域名空间具有权威性的 DNS 服务器的引用。然后，DNS 客户端将对引用地址进行查询。此过程继续使用查询链中的其他 DNS 服务器，直至发生错误或超时为止。
- ``递归查询``
在递归查询中，DNS 客户端要求 DNS 服务器（一般为 DNS 递归解析器）将使用所请求的资源记录响应客户端，或者如果解析器无法找到该记录，则返回错误消息。

ARP 过程
--------
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