Content Delivery Networks (CDNs): A Detailed Analysis of Different Architectures

Published by: Generator Research Limited

Published: Jun. 20, 2008 - 39 Pages

Table of Contents

Synopsis

Subject Area

Report Content

Key Benefits

Who Should Read this Report?

Contributors

Executive Summary

Network Considerations: Internet

Performance

Cost

Limited Capacity, Real Costs

Long Links vs. Short Links

Transit and Peering Agreements

Transit Agreements

Peering Agreements

Content Delivery Networks: Architecture Options

Core Delivery

Edge Delivery

End User Delivery

Network Model

Contention Ratio

What the Contention Ratio Means

Architectural Comparison

Case 1a: Hosted, No Local Cache (Parasitic Transit)

Case 1b: Hosted, No Local Cache (Paidfor Transit)

Case 2: Hosted, Local Cache

Case 3: Hybrid P2P

P2P Network Operation

Traffic Distribution

Implications

Case 4: Network Aware Pure P2P

Summary: Impact Analysis

Appendix

Scenario: Home Environment

Contention Ratio

Amount of Time Spent Viewing Internet Television

Timeshifted Viewing"

Abstract

Content delivery network (CDNs) are intended to distribute bandwidth-intensive content like internet video over the internet. Popular services like hulu and BBC iPlayer used CDNs to distribute their content to users. This report uses a detailed network model and in-depth analysis to compare and contrast the four different strategies used by CDNs: (1) Hosted, no local cache (parasitic transit & paid-for transit); (2) Hosted, local caches; (3) Hybrid (P2P and local caches) and, most advanced, (4) Network Aware, Pure P2P.

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