  The problem of characterizing classical and quantum correlations in networks
is considered. Contrary to the usual Bell scenario, where distant observers
share a physical system emitted by one common source, a network features
several independent sources, each distributing a physical system to a subset of
observers. In the quantum setting, the observers can perform joint measurements
on initially independent systems, which may lead to strong correlations across
the whole network. In this work, we introduce a technique to systematically map
a Bell inequality to a family of Bell-type inequalities bounding classical
correlations on networks in a star-configuration. Also, we show that whenever a
given Bell inequality can be violated by some entangled state $\rho$, then all
the corresponding network inequalities can be violated by considering many
copies of $\rho$ distributed in the star network. The relevance of these ideas
is illustrated by applying our method to a specific multi-setting Bell
inequality. We derive the corresponding network inequalities, and study their
quantum violations.
