gloss_Q

Q

QOS

Quality of Service is a catchphrase for a network that can transport data without losing cells , with predictable end-to-end delay, and with real-time delivery of data once the connection is completed. High-quality multimedia over a network, whether in real-time or merely playing audio or video files from a server, requires a network that can deliver QOS. Protocols such as ATM (Asynchronous Transfer Mode) are designed to deliver multiple levels of QOS. Attempting to deliver QOS using IP requires additional services such as RSVP (Resource Reservation Protocol), which allows bandwidth to be reserved and to be supported on intermediate devices such as routers.

query language.

A query language enables users to retrieve information. Structured Query Language (SQL) is a standardized, vendor-independent query language, though most database vendors have proprietary extensions to SQL.