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Glossary
GL-11
Cisco 10008 Router Hardware Installation Guide
OL-0659-13
Q
QoS
Quality of service. A measure of performance for a transmission system that reflects its transmission
quality and service availability.
QPPB
QoS Policy Propagation by BGP. A feature that classifies packets by IP precedence based on BGP
community lists, BGP autonomous system paths, and access lists. After a packet is classified, other
quality of service features such as committed access rate (CAR) and Weighted Random Early Detection
(WRED) can specify and enforce policies to fit a business model.
Quality of Service
See QoS.
R
RAM
Random-access memory. Volatile memory that can be read and written by a microprocessor.
Random Access
Memory
See RAM.
Read only memory
See ROM.
Redundancy
In internetworking, the duplication of devices, services, or connections so that, in the event of a failure,
the redundant devices, services, or connections can perform the work of those that failed.
Remote monitoring
See RMON.
Request for
comments
See RFC.
RFC
Request for comments. A document series used as the primary means for communicating information
about the Internet. Some RFCs are designated by the IAB as Internet standards. Most RFCs document
protocol specifications such as Telnet and FTP, but some are humorous or historical. RFCs are
available online from numerous sources.
RMON
Remote Monitoring. MIB agent specification described in RFC 1271 that defines functions for the
remote monitoring of networked devices. The RMON specification provides numerous monitoring,
problem detection, and reporting capabilities.
ROM
Read only memory. Nonvolatile memory that can be read, but not written, by the microprocessor.
S
SAR
Segmentation and reassembly. One of the two sublayers of the AAL common part convergence sublayer,
responsible for dividing (at the source) and reassembling (at the destination) the protocol data units (PDUs)
passed from the convergence sublayer. The SAR sublayer takes the PDUs processed by the convergence
sublayer and, after dividing them into 48-byte pieces of payload data, passes them to the ATM layer for
further processing. See also AAL.
Short reach
See SR.