TCP/IP protocol refers to more than TCP? And IP, but refers to a protocol cluster composed of FTP, SMTP, TCP, UDP, IP, etc. It is called TCP/IP protocol only because TCP and IP protocols are the most representative of TCP/IP protocols.
The role of TCP: When the application layer sends the data stream represented by 8-bit bytes to the TCP layer for inter-network transmission, TCP divides the data stream into message segments with appropriate length, and the maximum transmission segment size (MSS) is usually limited by the maximum transmission unit (MTU) of the data link layer of the network to which the computer is connected. Then TCP sends the packet to the IP layer, which will send the packet to the TCP layer of the receiving entity through the network.
IP function: transmit IP packets. Segmentation and reassembly of data packets.
Defects of TCP/IP protocol
(1) This model does not clearly distinguish the concepts of service, interface and protocol. Therefore, TCP/IP model is not a good template for designing new networks with new technologies.
(2)TCP/IP model is not universal at all, and it is not suitable for describing any protocol stack except TCP/IP model.
(3) The link layer is not a layer in the usual sense. It is the interface between the network layer and the data link layer. The distinction between interfaces and layers is very important.
Refer to the above? Baidu encyclopedia -IP
Refer to the above? Baidu encyclopedia -TCP
Refer to the above? Baidu encyclopedia -TCP/IP protocol