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The Scientific World Journal
Volume 2013 (2013), Article ID 938418, 8 pages
http://dx.doi.org/10.1155/2013/938418
Research Article

Analysis of DNS Cache Effects on Query Distribution

1Computer Network Information Center, Chinese Academy of Sciences, No. 4 South 4th Street, Zhongguancun, Beijing 100190, China
2China Organizational Name Administration Center, Jia 31, North Guangximen, Xibahe, Beijing 100028, China

Received 31 July 2013; Accepted 14 November 2013

Academic Editors: J. Shu and F. Yu

Copyright © 2013 Zheng Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper studies the DNS cache effects that occur on query distribution at the CN top-level domain (TLD) server. We first filter out the malformed DNS queries to purify the log data pollution according to six categories. A model for DNS resolution, more specifically DNS caching, is presented. We demonstrate the presence and magnitude of DNS cache effects and the cache sharing effects on the request distribution through analytic model and simulation. CN TLD log data results are provided and analyzed based on the cache model. The approximate TTL distribution for domain name is inferred quantificationally.