By Nihon Sofutowea Kagakkai
The 3rd quantity of this serial book comprises unique study contributions, together with numerous on object-oriented programming. it's a translation of the unique works in the Japan Society of software program technological know-how and expertise
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In Fig. 6, every connection class inherits the adjacent class corresponding to a lower layer as one of its superclasses, considering the upper layer inherits the characteristics of all the lower layers. In contrast, Fig. 7 shows another kind of class hierarchy. It regards all the layer classes as parts of connection classes, and each connection class inherits all the required layer classes directly. A comparison of these class hierarchies shows the following characteristics: (1) Flexibility in the lower layer modification or extension.
These features are especially important in a development environment where protocol modules are frequently modified and software is developed in an incremental manner. 3 S t r u c t u r e of a C o n n e c t i o n M o d u l e Figure 4 shows the structure of the connection-oriented implementation model. Each connection module, C, consists of a buffer for storing the packet, pointers to layer modules, working registers, registers to save each connection state, and connection identifiers. Unlike the conventional implementation, there is no process in each layer module.
TCP detects transmission errors and recovers them by retransmission. The flow control in TCP allows a receiving TCP to regulate the rate at which data arrives from a sending TCP. TCP allows multiple application programs on a given machine to communicate simultaneously, and it demultiplexes incoming TCP traffic among application programs. Hence, each application program can regard the connection as a dedicated hardware circuit for that program. UDP (User Datagram Protocol) is another protocol on top of IP.