主机host1对host2进行域名查询的过程如下图所示，下列说法中正确的是（ ）。
- A.本地域名服务器采用迭代算法
- B.中介域名服务器采用迭代算法
- C.根域名服务器采用递归算法
- D.授权域名服务器采用何种算法不确定
正确答案及解析
正确答案
解析
DNS域名解析有两种算法递归查询，一般客户机和服务器之间属递归查询，即当客户机向DNS服务器发出请求后,若DNS服务器本身不能解析,则会向另外的DNS服务器发出查询请求，得到结果后转交给客户机。本题本地域名服务器采用递归查询。迭代查询(反复查询)，一般DNS服务器之间属迭代查询，如：若DNS2不能响应DNS1的请求，则它会将DNS3的IP给DNS2，以便其再向DNS3发出请求。本题中介域名服务器采用迭代算法查询。
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