  We discuss a simple extension of the Standard Model (SM) that provides an
explicit realization of the dark-matter (DM) neutrino-portal paradigm. The dark
sector is composed of a scalar $ \Phi $ and a Dirac fermion $ \Psi $, with the
latter assumed to be lighter than the former. These particles interact with the
SM through the exchange of a set of heavy Dirac fermion mediators that are
neutral under all local SM symmetries, and also under the dark-sector symmetry
that stabilizes the $ \Psi $ against decay. We show that this model can
accommodate all experimental and observational constraints provided the DM mass
is below $\sim 35\, \gev $ or is in a resonant region of the Higgs or $Z$
boson. We also show that if the dark scalar and dark fermion are almost
degenerate in mass, heavier DM fermions are not excluded. We note that in this
scenario DM annihilation in the cores of astrophysical objects and the galactic
halo produces a monochromatic neutrino beam of energy $ \mfe $, which provides
a clear signature for this paradigm. Other experimental signatures are also
discussed.
