Open System Services NFS SCF Reference Manual

Glossary
Open System Services NFS SCF Reference Manual—522582-001
Glo ssary-10
SMTP
SMTP. See Simple Mail Transfer Protocol (SMTP).
SNAP. See Subnetwork Access Protocol (SNAP)
.
socket. An end-point for stream-oriented communication. A socket has a file descriptor.
source quench. A congestion-control technique in which a system experiencing congestion
sends a request back to the source of the packets causing the congestion asking that the
source stop transmitting. In the Internet, gateways use Internet Control Message
Protocol (ICMP) source quench to stop or reduce the transmission of Internet Protocol
(IP) datagrams.
Subnetwork Access Protocol (SNAP). Defines the interface between the Internet Protocol
(IP) layer and the link-level control (LLC) layer to run the Transmission Control
Protocol/Internet Protocol (TCP/IP) suite over IEEE networks. The interface is
accomplished by the use of an extension of the LLC header that contains a predefined
service access point (SAP) for use in the source SAP (SSAP) and destination SAP
(DSAP) fields of the LLC header.
subnetwork work address. An extension of the Internet addressing scheme that allows a site
to use a single Internet address for multiple physical networks. Outside of the site using
subnetwork work addressing, routing continues as usual by dividing the destination
address into an Internet portion and local portion. Gateways and hosts inside a site using
subnetwork work addressing interpret the local portion of the address by dividing it into
a physical network portion and host portion.
symbolic link. A type of special file that acts as a name pointer to another file. A symbolic
link contains a pathname and can be used to point to a file in another fileset. Symbolic
links are not included in ISO/IEC IS 9945-1: 1990. Compare to hard link
.
Tandem TCP/IP. See The product name for the OSS environments. See also Open System
Services (OSS)..
TCP. See Transmission Control Protocol (TCP)
.
TCP/IP. See Transmission Control Protocol (TCP)
over Internet Protocol (IP).
TELNET. The Internet-standard protocol for remote terminal connection service. TELNET
allows a user at one site to interact with remote timesharing systems at another site just
as though the user’s terminal were connected directly to the remote system. That is, the
user invokes a TELNET application program that connects to a remote system, prompts
for a login ID and password, and then passes keystrokes from the user’s terminal to the
remote system and displays output from the remote system on the user’s terminal.
TELNET provides a virtual terminal service. Through the concept of a Network Virtual
Terminal (NVT), it allows clients to access remote applications through use of a remote
server. TELNET has many options and is quite flexible. Through it, many diverse
terminal data streams can be communicated beyond the basic NVT data stream.
Transmission Control Protocol (TCP). The Internet-standard transport-level protocol that
provides the reliable, full-duplex stream service that many application protocols depend