Resumen
The article reports that the network, computer engineering and computer science research has long been dependent on a core Internet infrastructure, including the ARPANET and National Science Foundation Network (NSFNET), providing concurrent support for application, computational, and network research. Since the mid-1990s, however, as a result of research networks evolving into production systems, there has been a notable lack of any new such infrastructure to support this goal. Many current government programs, including the National Science Foundation's testbed and experimental programs, advocate and support the three-tiered model of production, experimental and research network infrastructures. The ARPANET began with a few sites focusing on basic network protocol research, coupled with a smattering of applications including the File Transfer Protocol (FTP) and email. As the ARPANET grew and evolved into the NSFNET during the late 1980s, the nature of the research also evolved toward higher-layer network challenges including next-generation routing devices, as well as scaling, peering, and network monitoring driven by applications requiring collaboration and interconnectivity among research communities.