Glossary Terms - S

selector (selector)
The identifier used by an OSI entity to distinguish among multiple SAPs at which it provides services to the layer above. See port. [Source: RFC 1208]
SLIP (Serial Line IP)
Serial Line IP. An Internet protocol used to run IP over serial lines such as telephone circuits or RS-232 cables interconnecting two systems. SLIP is now being replaced by PPP. See PPP. [Source: RFC 1208]
SAP (Service Access Point)
The point at which the services of an OSI layer are made available to the next higher layer. The SAP is named according to the layer providing the services: e.g., Transport services are provided at a Transport SAP (TSAP) at the top of the Transport Layer. [Source: RFC 1208]
Session Layer (Session Layer)
The OSI layer that provides means for dialogue control between end systems. [Source: RFC 1208]
(show version)
Cisco IOS command which provides the following information:\r\nSoftware version, config files, boot images, config register and basic config of router [Source: Internetwork Training]
SGMP (Simple Gateway Management Protocol)
The predecessor to SNMP. See SNMP. [Source: RFC 1208]
SMTP (Simple Mail Transfer Protocol)
The Internet electronic mail protocol. Defined in RFC 821, with associated message format descriptions in RFC 822. [Source: RFC 1208]
SNMP (Simple Network Management Protocol)
The network management protocol of choice for TCP/IP-based internets. [Source: RFC 1208]
SPAG (Standards Promotion and Application Group)
A group of European OSI manufacturers which chooses option subsets and publishes these in a "Guide to the Use of Standards" (GUS). [Source: RFC 1208]
SMI (Structure of Management Information)
The rules used to define the objects that can be accessed via a network management protocol. See MIB. [Source: RFC 1208]
SQL (Structured Query Language)
The international standard language for defining and accessing relational databases. [Source: RFC 1208]
subnet mask (subnet mask)
See address mask. [Source: RFC 1208]
subnetwork (subnetwork)
A collection of OSI end systems and intermediate systems under the control of a single administrative domain and utilizing a single network access protocol. Examples: private X.25 networks, collection of bridged LANs. [Source: RFC 1208]
SMDS (Switched Multimegabit Data Service)
An emerging high-speed networking technology to be offered by the telephone companies in the U.S. [Source: RFC 1208]
SNA (Systems Network Architecture)
IBM's proprietary network architecture. [Source: RFC 1208]

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