In fact, Chapter III also read some of the transport layer, the second chapter is also almost done the job, but have been too lazy to sum up front, but only a summary in order to have a more profound care, were to sum up today, I had wanted to be typing, but in the end feel of typing is very convenient, when not engage in drawing, so a direct handwriting, here to take pictures to record the way.
2.1 application layer protocols principle
2.2Web and http
2.3 E-mail
2.4DNS
2.5P2P File Distribution
2.6 streaming video content distribution network and
This did not quite understand, to be more. .
2.7 Socket Programming
This personally feel that looking directly at the rookie tutorial on the line,