Chapter1_2_Part_5

Chapter1_2_Part_5 - Throughput throughput: rate (bits/time...

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Throughput ± throughput: rate (bits/time unit) at which bits transferred between sender/receiver ² instantaneous : rate at given point in time ² average: rate over longer period of time link capacity R c bits/sec (fluid) into pipe Introduction 1-57 pipe that can carry fluid at rate R s bits/sec) pipe that can carry fluid at rate R c bits/sec) Throughput (more) ± R s < R c What is average end-end throughput? R s bits/sec R c bits/sec ± > R What is average end-end throughput? R s bits/sec R c bits/sec link on end-end path that constrains end-end throughput bottleneck link Introduction 1-58
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Throughput: Internet scenario 10 connections (fairly) share backbone bottleneck link R bits/sec R s R s R s R c R c R c R ± per-connection end-end throughput: min(R c ,R s ,R/10) ± in practice: R c or R s is often bottleneck Introduction 1-59 Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge ± end systems, access networks, links 1.3 Network core ± circuit switching, packet switching, network structure 1.4 Delay, loss and throughput in packet-switched networks 1.5 Protocol layers, service models 1.6 Networks under attack: security 1.7 History Introduction 1-60
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Protocol “Layers” Networks are complex, with many “pieces”: ± hosts ±
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Chapter1_2_Part_5 - Throughput throughput: rate (bits/time...

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