Avaya Configuring IP Utilities Instrukcja Użytkownika Strona 47

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117358-A Rev. A 2-1
Chapter 2
TCP, FTP, TFTP, Telnet,
NTP, and NetBIOS over IP Concepts
This chapter describes the concepts behind TCP, FTP, TFTP, Telnet, NTP, and
NetBIOS over IP services and how we implement them in Bay Networks routers.
You can use this information to decide how to customize TCP, FTP, TFTP, Telnet,
NTP, and NetBIOS over IP 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 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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