Understanding of the [OSI] Network 7-tier model

Application layer: HTTP Application layer

Presentation layer: Coding presentation Layer

Session Layer: Port Session Layer

Transport Layer: TCP/UDP Protocol Transport Layer

Network layer: IP tag +--Network layer--+ Network layer

Data Link layer: Computer MAC address Tag |　　　| Data Link Layer

Physical layer: Network cable, Crystal Head, computer socket | +----> Physical layer

+------------------------------------->+

"The bottom layer serves the upper layer and is transparent, and the corresponding protocol and port are consistent at each level in the communication process."

Pictures on the Internet:

Link:http://www.cnblogs.com/farwish/p/5860843.html

Understanding of the [OSI] Network 7-tier model