下图是DNS转发器工作的过程。采用迭代查询算法的是（ ）。
- A.转发器和本地DNS服务器
- B.根域名服务器和本地DNS服务器
- C.本地DNS服务器和.com域名服务器
- D.根域名服务器和.com域名服务器
正确答案及解析
正确答案
解析
只要发出递归查询，服务器必需回答目标IP与域名的映射关系。而迭代查询是，服务器收到一次迭代查询回复一次结果，这个结果不一定是目标IP与域名的映射关系，也可以是其它DNS服务器的地址。
一般情况下从客户端到本地DNS服务器是属于递归查询，而DNS服务器之间就是的交互查询就是迭代查询。
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