Algorithm算法代写代考

Packet-Switching Networks Traffic Management Packet Level Flow Level Flow-Aggregate Level Traffic Management Vehicular traffic management  Traffic lights & signals control flow of traffic in city street system  Objective is to maximize flow with tolerable delays  Priority Services  Police sirens  Cavalcade for dignitaries  Bus & High-usage lanes  Trucks allowed […]

Differentiated Services Anjali Agarwal Disadvantages of Integrated Services  Routers keep flow-specific state for each flow  State information increases with number of flows  Routers need large storage space and high processing power  Routers more complex – need to implement RSVP protocol, admission control, packet classifier, per-flow packet-scheduling algorithm 2 Differentiated Services 

Integrated Services/RSVP Anjali Agarwal Integrated Services IP Model  Defines a flow as a stream of IP packets » Generated by a sender and destined to a destination » ThatrequirethesameQoS  Provides QoS to individual flows in the Internet » “Better than Best Effort” for some applications » Supportforreal-timevoiceandvideoapplications  Requires traffic management mechanisms to

Packet-Switching Networks Routing in Packet Networks Routing in Packet Networks 1 3 4 2  1-3-6, 1-4-5-6, 1-2-5-6  Which is “best”?  Min delay? Min hop? Max bandwidth? Min cost? Max reliability? 5  Three possible (loopfree) routes from 1 to 6: Node (switch or router) 6 Creating the Routing Tables  Need information