Chapter1-part3 - Chapter 1 roadmap 1.1 What is the Internet...

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Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge v end systems, access networks, links 1.3 Network core v circuit switching vs packet switching, v network structure 1.4 Performance: v delay, loss and throughput 1.5 Protocol layers, service models 1.6 Networks under attack: security 1.7 History Introduction 1-80
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Internet Structure: network of networks v End systems connect to Internet via access ISPs (Internet Service Providers) § Residential, company and university ISPs v Access ISPs in turn must be interconnected. v So that any two hosts can send packets to each other v Resulting network of networks is very complex v Evolution was driven by economics and national policies v Let s take a stepwise approach to describe current Internet structure
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Internet structure: network of networks v End systems connect to Internet via access ISPs: v residential, company and university ISPs v Question: given millions of access ISPs, how to connect them together? v Considerations: engineering but also economics+policy access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net
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Internet structure: network of networks Option: connect each access ISP to every other access ISP? access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net connecting each access ISP to each other directly doesn’t scale: O( N 2 ) connections.
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Internet structure: network of networks access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net Option: connect each access ISP to a global transit ISP? Customer and provider ISPs have economic agreement. global ISP
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Internet structure: network of networks access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net But if one global ISP is viable business, there will be competitors …. ISP B ISP A ISP C
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Internet structure: network of networks access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net But if one global ISP is viable business, there will be competitors …. which must be interconnected ISP B ISP A ISP C IXP IXP peering link Internet exchange point
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Internet structure: network of networks access net access net access net access net access
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