OSI and TCP/IP are very basic but very important knowledge. Many knowledge points are connected in series based on them. As the bottom layer, the more thorough the mastery, the smoother the understanding of the upper layer will be. Today's basic network science popularization is based on the OSI level to expand one by one.
01
Basics of Computer Networks
01 Classification of computer networks
According to the scope of the network: wide area network (WAN), metropolitan area network (MAN), local area network (LAN);
By network user: public network, private network.
02 Hierarchical structure of computer network
Comparison of TCP/IP four-layer model and OSI architecture: