Chapter1_2_Part_4

Chapter1_2_Part_4 - Internet structure: network of networks...

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Tier 2 ISP Internet structure: network of networks Introduction 1-43 Tier 1 ISP Tier 1 ISP Large Content Distributor (e.g., Google) Large Content Distributor (e.g., Akamai) IXP IXP Tier 1 ISP “tier-2” ISPs: smaller (often regional) ISPs ± connect to one or more tier-1 (provider) ISPs ² each tier-1 has many tier-2 customer nets ² tier 2 pays tier 1 provider ± tier-2 nets sometimes peer directly with each other (bypassing tier 1) , or at IXP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Internet structure: network of networks Introduction 1-44 Tier 1 ISP Tier 1 ISP Large Content Distributor (e.g., Google) Large Content Distributor (e.g., Akamai) IXP IXP Tier 1 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP ± “Tier-3” ISPs, local ISPs ± customer of tier 1 or tier 2 network ² last hop (“access”) network (closest to end systems)
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Tier 2 ISP Internet structure: network of networks Introduction 1-45 Tier 1 ISP Tier 1 ISP Large Content Distributor (e.g., Google) Large Content Distributor (e.g., Akamai) IXP IXP Tier 1 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP Tier 2 ISP ± a packet passes through many networks from source host to destination host 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 1-46
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How do loss and delay occur? packets
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This note was uploaded on 02/14/2012 for the course CSE 3214 taught by Professor Ross during the Winter '12 term at York University.

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Chapter1_2_Part_4 - Internet structure: network of networks...

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