Measuring Websites from a Global Perspective

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Sarolahti, Pasi Boye, Magnus 2014-03-06T09:15:49Z 2014-03-06T09:15:49Z 2014-02-10
dc.description.abstract Since the invention of the World Wide Web the content and services provided on the web have changed significantly. In search of cost savings governments and businesses push online services, and the web has therefore become ever more important to many people. It is therefore important to understand the performance of web page delivery, in order to improve the user experience of the web. The goal of this Master's thesis is to evaluate the network performance of web page delivery in relation to content distribution networks.We use the global measurement platform PlanetLab to perform active measurements of the performance of DNS and HTTP when downloading web pages. Domain names are resolved using iterative resolution, Google DNS, OpenDNS, and the default DNS server of measurement nodes. This enables us to asses how the choice of DNS resolver affects CDN server selection. The measurements reveal that network latency has the greatest impact on DNS resolution time and that nearby DNS servers will generally have the lowest resolution time. We developed an effective method of identifying CDNs and applied it to the measurement data. We analyze the accuracy of the DNS resolvers and determine that the use of a recursive DNS server close to the end-user typically results in server selections more similar to the optimal server selection of a CDN. However, we did not establish a relationship between resolver accuracy and HTTP performance. Finally, we compare the throughput of CDNs and observe that CDNs are likely optimized for different file sizes. en
dc.format.extent 4 + 86
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Measuring Websites from a Global Perspective en
dc.type G2 Pro gradu, diplomityö en Sähkötekniikan korkeakoulu fi
dc.subject.keyword Active measurements en
dc.subject.keyword DNS en
dc.subject.keyword HTTP en
dc.subject.keyword CDN en
dc.subject.keyword Websites en
dc.identifier.urn URN:NBN:fi:aalto-201403061524
dc.programme.major Networking Technology fi
dc.programme.mcode S3029 fi
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Ott, Jörg
dc.programme TLT - Tietoliikennetekniikka fi
dc.location P1 fi

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