資料: Internet Infrastructure Review
【資料】 ◆Internet Infrastructure Review Vol.18 (IIJ, 2013/02) http://www.iij.ad.jp/company/development/report/iir/pdf/iir_vol18.pdf
【資料】 ◆Internet Infrastructure Review Vol.18 (IIJ, 2013/02) http://www.iij.ad.jp/company/development/report/iir/pdf/iir_vol18.pdf
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