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When large files are offered by many mirrors for clients to download, selecting the proper download mirrors is necessary in speeding up the clients' download. The existing method, which measures all the Round Trip Time (RTT) between clients and all mirrors, costs much time and Internet traffic. In this paper, the authors propose NC-APT, an efficient and scalable download mirror selecting system, which is capable to provide clients an efficient method to select quick download mirror. NC-APT is scalable because it only requires the mirrors to response to ICMP ping instead of keeping running an NC software program. Their experimental results show that NC-APT significantly improves the clients' download rates with slight cost of time and Internet traffic.
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