(Last time, I briefly mentioned TCP / IP protocol, which is the lower layer protocol of HTTP protocol and is responsible for specific data transmission. It also specifically says that TCP / IP protocol is a "layered protocol stack".In your work, you must often hear others say "four layers of load balancing", "seven layers of load balancing", "two layers of forwarding" and "three layers of routing". Do you really understand the meaning of these layers?The knowledge of network stratification exists in textbooks, but many of them are "generalized", only "academic value", which is easy to be "disconnected" from practical application. Sometimes you feel "confused".So, today I'll help you sort out these vague concepts from the perspective of HTTP applications.)
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