Avaya Configuring TCP Services Instrukcja Użytkownika Pobierz pdf (Strona 20)

Configuring TCP Services

1-4

TCP and IP Service Users

TCP is the layer or service between IP, at the lower layer in the hierarchy of

network protocols, and programs running at higher layers in the hierarchy.

Figure 1-1 shows a simple network architecture with four users of TCP/IP

services: the Data Link Switching Service (DLSw), Telnet, FTP, and the Border

Gateway Protocol (BGP).

Figure 1-1. TCP between IP and Clients

The interface between TCP and programs that use TCP consists of a set of

messages exchanged between the clients and TCP, and a set of functions and

macros that user programs call to exchange TCP messages. These programs use

the functions and macros to

• Open, close, abort, and get the status of connections

• Control the ﬂow of data

• Encapsulate data for TCP to transmit

• Process received TCP data

When a program passes data to TCP, the TCP layer formats the data and calls on

the IP layer to transmit the data to its destination.

For information on creating TCP on the router and editing TCP parameters, refer

to “Conﬁguring and Customizing TCP” in Chapter 3.

TCP

Telnet BGPDLSw FTP

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Avaya Configuring TCP Services Instrukcja Użytkownika Strona 20