DHCP工作过程包括哪四种报文 DHCP工作过程包括哪四种报文？
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\uff084\uff09\u670d\u52a1\u5668\u56de\u5e94DHCP\u786e\u8ba4\uff08DHCP ACK\uff09
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DHCP（Dynamic Host Configuration Protocol，动态主机配置协议）通常被应用在大型的局域网络环境中，主要作用是集中的管理、分配IP地址，使网络环境中的主机动态的获得IP地址、Gateway地址、DNS服务器地址等信息，并能够提升地址的使用率。
DHCP协议采用客户端/服务器模型，主机地址的动态分配任务由网络主机驱动。当DHCP服务器接收到来自网络主机申请地址的信息时，才会向网络主机发送相关的地址配置等信息，以实现网络主机地址信息的动态配置。DHCP具有以下功能：
1. 保证任何IP地址在同一时刻只能由一台DHCP客户机所使用。
2. DHCP应当可以给用户分配永久固定的IP地址。
3. DHCP应当可以同用其他方法获得IP地址的主机共存（如手工配置IP地址的主机）。
4. DHCP服务器应当向现有的BOOTP客户端提供服务。
DHCP四种报文数据包
一、discover
二、offer
三、request
四、ack
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