Architectures of interconnection of network laboratories in distributed learning environment

For practical laboratory exercises of networking subjects it proved efficient to interconnect laboratories of multiple institutions to build large-scale virtual education environment, which may be accessible as part of common e-learning system. In the article we describe various approaches of creation of such distributed virtual topologies and experience with technical solutions tested in real e-learning education environment. Most of presented technologies are also beneficial to automatize topology interconnection process in standard networking laboratory to save teacherpsilas work and gain more time for real studentspsila practising.