Network testing series [Series Editorial]

This is the second issue of the still "new" Network Testing Series. Compared to two accepted out of nine submissions in the first call, this second call received eight submissions, and we accepted three of them, and one submission that received the decision of "major revisions" in the first call got accepted in the second call. Yes, this series allows a second round of reviews if the work has merits but needs further reworking. Among the three accepted articles, one is on peer-to-peer measurements on the prevailing BitTorrent ecosystem, while the other two are on combining emulation and simulation for massive service evaluation and multimedia over networks. The former is Internet-scale measurement, while the latter two belong to testbed construction. All of them belong to "larger-scale" issues in terms of network testing, compared to the "smaller-scale" issues at the "device-level" and the "component-level." It appears that the academic submissions often fall in the larger-scale issues. In this series we continue to solicit submissions that address the smallerscale issues, which would interest the industry community in addition to the academic community.