  A comparative analysis of structural and flow approaches to analysis of
vulnerability of complex network systems (NS) from targeted attacks and
non-target lesions of various types was carried out. Typical structural and
functional scenarios of successive targeted attacks on the most important by
certain characteristics system elements were considered, and scenarios of
simultaneous group attacks on the most significant NS's components were
proposed. The problem of system lesions scale from heterogeneous negative
impacts was investigated and it was confirmed that the flow approach allows us
to obtain a much more realistic picture of consequences of such lesions. It is
shown that scenarios of group targeted attacks built on the basis of the NC
flow model are more optimal from the point of view of choosing attack targets
than structural ones.
