OSI各层功能和TCPIP协议族的对应协议

What is overlay network?
An overlay network is a computer network that is built on top of another network. Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. For example, distributed systems such as peer-to-peer networks and client-server applications are overlay networks because their nodes run on top of the Internet. The Internet was originally built as an overlay upon the telephone network, while today (through the advent of VoIP), the telephone network is increasingly turning into an overlay network built on top of the Internet.
For further information, please refer to Overlay network from WIKI website.

OSI中的层 功能 TCP/IP协议族
应用层 文件传输, 电子邮件,文件服务,虚拟终端 TFTP,HTTP,SNMP,FTP,SMTP,DNS,Telnet 等等
表示层 数据格式化,代码转换,数据加密 没有协议
会话层 解除或建立与别的接点的联系 没有协议
传输层 提供端对端的接口 TCP,UDP
网络层 为数据包选择路由 IP,ICMP,OSPF,EIGRP,IGMP
数据链路层 传输有地址的帧以及错误检测功能 SLIP,CSLIP,PPP,MTU
物理层 以二进制数据形式在物理媒体上传输数据 ISO2110,IEEE802,IEEE802.2

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