Avaya Configuring IP Utilities Uživatelský manuál stáhnout pdf (Strana 31)

114071 Rev. A 2-1

Chapter 2

TCP, FTP, Telnet, and NTP Concepts

This chapter describes the concepts behind TCP, FTP, Telnet, and NTP and how

we implement them in Bay Networks routers. You can use this information to

decide how to customize TCP, FTP, Telnet, and NTP parameters for your system.

TCP Overview

In the 1970s, the Defense Advanced Research Projects Agency (DARPA) of the

U.S. Department of Defense (DOD) developed the Transmission Control Protocol

(TCP) to provide communication among hosts manufactured by different vendors.

DARPA designed TCP to work within a layered hierarchy of networking

protocols, using the Internet Protocol (IP) to transfer data.

Built upon the IP layer suite, TCP is a connection-oriented, end-to-end protocol

that provides the packet sequencing, error control, and other services required to

provide reliable end-to-end communications. IP takes the packet from TCP and

passes it along whatever gateways are needed, for delivery to the remote TCP

layer through the remote IP layer.

The Bay Networks implementation of TCP generally ensures good terminal server

performance on slow-speed links as well as high-speed LAN links. TCP Services

are required to support upper-layer protocols, such as Telnet and FTP, which are

part of the TCP/IP suite.

TCP does not require reliability of the communication protocols below itself.

Therefore, TCP functions with lower-level protocols that are simple, potentially

unreliable datagram services. TCP uses IP for a lower-level protocol.

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Avaya Configuring IP Utilities Uživatelský manuál Strana 31