若一直得不到回应，DHCP客户端总共会广播（ ）次请求。
- A.3
- B.4
- C.5
- D.6
正确答案及解析
正确答案
解析
DHCP客户机在发出IP租用请求的DHCPDISCOVER广播包后，将花费1秒钟的 时间等待DHCP服务器的回应，如果1秒钟没有服务器的回应，它会将这一广播包重新广播四次（以2，4，8和16秒为间隔，加上1~1000毫秒之间随机 长度的时间）。四次之后，如果仍未能收到服务器的回应，则运行Windows 2000的DHCP客户机将从169.254.0.0/16这个自动保留的私有IP地址（APIPA）中选用一个IP地址，而运行其他操作系统的DHCP 客户机将无法获得IP地址。DHCP客户机仍然每隔5分钟重新广播一次，如果收到某个服务器的回应，则继续IP租用过程。
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