summarize
Computers to connect and communicate across a network, to follow certain rules, is the network communication protocol
TCP / IP protocol four layers: application, transport, network, link layer
UDP and TCP: U is not connected, transmission, sending and receiving ends are not confirmed, the hair just sent, received just received
UDP and TCP protocol
UDP is the User Datagram Protocol acronym, called User Datagram Protocol, TCP is the Transmission Control Protocol acronym, called Transmission Control Protocol.
The UDP : connectionless communication protocol, data transmission, sender and receiver does not establish a logical connection. Appreciated: transmitting data to each of two points, the sender does not confirm whether the receiver is present, it will send data, the same data is received at the receiving end, the feedback is not received to the transmitting end whether the data
The TCP : connection-oriented communications protocol, and to establish the transmission receiving end before sending
Datagram Packet