可能重复：
DHCP协议是否允许服务器为客户提供多个地址而不是一个？
如果答案是肯定的，那为什么呢？
以下是原来的问题：
dhcp client sends to server dhcp discover message, server replies to client "dhcp offer", which includes multiple ip addresses, the client can pick up one that it preferes, then sends to server dhcp request, including the ip that it wants to pick up. my queestion is, why server sends to client multiple ip addresses so that it can select,rather than just assign it one ip address? 我从来没有听说过在单个请求中提供多个IP到客户端的DHCP服务器。 据我所知，一个DHCP服务器select一个IP（并且通过opotionally检查IP是否与一个icmp ping一起使用）并提供给客户端。 客户要么接受要么拒绝租赁。
打印出维基百科的副本，并用它敲打你的朋友： [citation needed] 。