笨得很想飞的专栏

转自http://www.cnblogs.com/maowang1991/archive/2013/04/15/3022955.html首先要看TCP/IP协议，涉及到四层：链路层，网络层，传输层，应用层。 　　其中以太网（Ethernet）的数据帧在链路层 　　IP包在网络层 　　TCP或UDP包在传输层 　　TCP或UDP中的数据（Data)在应用层 　　它们的

The use of dynamic address allocation in DHCP means a whole new way of thinking about addresses. A client no longer owns an address, but rather leases it. This means that when a client machine is se