Network Programming - Internet Protocol (Network Programming)

1. C/S, B/S architecture 
    client client <-------> server server 
    browser browser <------> server server 
What is the network? 
To communicate between people, first of all The underlying physical link medium must be established and communicated. 
1. The physical link medium is only the carrier of communication 
2. There must be a unified standard for communication (such as English) 
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computer needs to contact other computers