QoS - Quality of Service
QoS parameters
- Availability, Reliability, Timeliness
Timeliness - timely delivery of packets
- Packets be delivered within a certain period of time (to produce a smooth, continuous output
- Required by some applications, especially real time applications (e.g., voice and video frames)
- (e-mail doesn’t require this)
QoS routing
- Defines classes of service, each with a different priority:
- Real-time applications - highest
- A graphical file for a Web page - a lower priority
- E-mail - lowest (can wait a long time before delivery)