Книга: Real-Time Concepts for Embedded Systems

9.2.1 TCP/IP Protocol Stack

9.2.1 TCP/IP Protocol Stack

The network protocol stacks and components, as illustrated in Figure 9.2, provide useful system services to an embedded application in a networked environment. The TCP/IP protocol stack provides transport services to both higher layer, well-known protocols, including Simple Network Management Protocol (SNMP), Network File System (NFS), and Telnet, and to user-defined protocols. The transport service can be either reliable connection-oriented service over the TCP protocol or unreliable connectionless service over the UDP protocol. The TCP/IP protocol stack can operate over various types of physical connections and networks, including Ethernet, Frame Relay, ATM, and ISDN networks using different frame encapsulation protocols, including the point-to-point protocol. It is common to find the transport services offered through standard Berkeley socket interfaces.


Figure 9.2: TCP/IP protocol stack component.

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