The TCP/IP Client/Server Structural Model
TCP/IP services primarily operate in the client/server model. It's a system in which a relatively small number of server machines provides services to a much larger number of client hosts (see Chapter 1).
Just as client/server networking applies to hardware, this same concept underlies the design of the TCP/IP protocols and software applications, as shown in Figure 8-1.
TCP/IP protocols are not set up so that two machines that want to communicate use identical software. Instead, a conscious decision was made to make communication function using matched, complementary pairs of client and server software. The client initiates communication by sending a request to a server for data or other information. The ...
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