CCNA Cisco Certified Network Associate Study Guide - FTP Server

704 Glossary
server Hardware and software that provide network services to clients.
set-based Set-based routers and switches use the set command to configure
devices. Cisco is moving away from set-based commands and is using
the Command-Line Interface (CLI) on all new devices.
Session layer Layer 5 of the OSI reference model, responsible for creating,
managing, and terminating sessions between applications and overseeing
data exchange between Presentation layer entities. See also:
Application layer, Data Link layer, Network layer, Physical layer, Presentation
layer, and Transport layer.
setup mode Mode that a router will enter if no configuration is found in
nonvolatile RAM when the router boots. Allows the administrator to configure
a router step-by-step. Not as robust or flexible as the Command-Line
Interface.
SF super frame: A super frame (also called a D4 frame) consists of 12
frames with 192 bits each, and the 193rd bit providing other functions
including error checking. SF is frequently used on T1 circuits. A newer version
of the technology is Extended Super Frame (ESF), which uses 24 frames.
See also: ESF.
signaling packet An informational packet created by an ATM-connected
mechanism that wants to establish connection with another such mechanism.
The packet contains the QoS parameters needed for connection and
the ATM NSAP address of the endpoint. The endpoint responds with a message
of acceptance if it is able to support the desired QoS, and the connection
is established. See also: QoS.
silicon switching A type of high-speed switching used in Cisco 7000
series routers, based on the use of a separate processor (the Silicon Switch
Processor, or SSP). See also: SSE.
simplex The mode at which data or a digital signal is transmitted. Simplex
is a way of transmitting in only one direction. Half duplex transmits in two
directions but only one direction at a time. Full duplex transmits both directions
simultaneously.