1. 1 Application layer QoS Don Towsley Univ. Massachusetts

2. 2 Premise Networking Technology l lots of BW in core l bottlenecks at peering points, access points l little support for QoS Applications l bulk data l continuous media l interactive (games, teleconferencing) l … and others l widely variable QoS requirements

3. 3 Overlay networks CDNs for bulk data l caching understood l logical topology? l routing? CDNs for streaming applications l caching strategies? (prefix caching) l handling heterogeneity? (transcoding) l handling variable quality network access? (resilient packet level FEC, playout delay adjustment)

4. 4 Next generation l distributed simulation nets l distributed game nets l teleconferencing nets l intelligent information retrieval nets

5. 5 Overlay networks intelligent game network teleconferencing network information retrieval network video distribution network

6. 6 Challenges l filtering (for QoS) l fast setup and teardown l specialized vs. general purpose l overlay net hierarchies l management