  The aim of this manuscript is to present a non-invasive method to recover the
network structure of a dynamical system. We propose to use a controlled probing
input and to measure the response of the network, in the spirit of what is done
to determine oscillation modes in large electrical networks. For a large class
of dynamical systems, we show that this approach is analytically tractable and
we confirm our findings by numerical simulations of networks of Kuramoto
oscillators. Our approach also allows us to determine the number of agents in
the network by probing and measuring a single one of them.
