Yesterday, Saturday, 19:00 and more was taken away to work overtime is how I did not think of ......
Looked at the application layer sections of the rest, the deepest image is DNS, turned out to be distributed to achieve, looked under the theory, is not an unusual tree table does not work linkage, which is one to many relationship. But each one to many relationships are saved to a different server. Whatever amount of data that will come up will be difficult, distributed services can refer to the practice of the DNS. DNS is to find IP services based on the host name. According to find key value, or is it quite hard to achieve.
Then SMTP, mail protocol. Work also has seen something small mail server, and another system message push convert and save a lot of home network mail server is a little bad, cause there function not take. This is the original principle.
P2P, a good number of large files are divided into small packets. Each downloaded host that is the client, the server also. What significant cost savings.
The remaining two agreements, it seems not extract anything out. Go to after-school exercise doing a ......