  Conductance of zigzag interfaces between graphene sheet and normal metal is
investigated in the tight-binding approximation. Boundary conditions, valid for
a variety of scattering problems, are constructed and applied to the normal
metal -- graphene -- normal metal (NGN) junctions. At the Dirac point, the
conductance is determined solely by the evanescent modes and is inversely
proportional to the length of the junction. It is also independent on the
interface resistance. Away from the Dirac point, the propagating modes'
contribution dominates. We also observe that even in the junctions with high
interface resistance, for certain modes, ideal transmission is possible via
Fabry-Perot like resonances.
