"Ti layman" network knowledge note one OSI Reference Model

Many training institutions and training tutorials have taken the "OSI Reference Model" as the beginning of the curriculum, which is a very important foundation for our learning network. The following is the OSI structure diagram

OSI: Layer Seventh Application layer (application)

Sixth Layer Presentation layer (Presentation)

Level fifth session

Fourth layer Transport Layer (TRANSPORT)

Third Layer Network layer (nerwork): IP, ARP, ICMP and other protocols, routing equipment, inter-network data transmission

Second Layer Data link layer: MAC header, switching device, intra-network transfer data frame

First layer physical layer (physical): bit stream bit, repeater, hub (for signal relay, shaping amplification to increase transmission distance)

OSI Advantage: Each layer is independent, a layer of change will not affect the other layers, promote standardization work, make the network easy to implement and maintain, realize interconnection, interoperability, interoperability.

The TCP/IP model is divided into a, B, C, D, e five categories

The main application of ABC three categories

a:10.0.0.0-10.255.255.255 (generally used for public network)

b:172.16.0.0-172.31.255.255

c:192.168.0.0-192.168.255.255 (BC generally used for intranet)

"Ti layman" network knowledge note one OSI Reference Model