Why
1.The user data into one of the advantages of each block of data transmission: reduce delay time?

2: what is the specific content of the agreement? What is physical implementation? Or logic algorithm??

[protocols and services understand]
Under the control of the protocol, the communication between the two peer entities that can provide service for the upper layer, realize the layer protocol, also need to use the services provided by the next layer

3. [data encapsulation]
And the layers of data unit without conflict?
What is a frame, message segment, grouping, Peter?
Applications, said the session just added the third photo?
The transport layer to the upper encapsulation into segments, increased reliability and flow control information
The network layer...

4. The application of Internet protocol is the TCP/IP protocol that USES packet switching technology