  Robustness of zero-modes of two-dimensional Dirac fermions is examined
numerically for the honeycomb lattice in the presence of Kekul\'e bond
ordering. The split $n=0$ Landau levels in a magnetic field as well as the
zero-modes generated by topological defects in the Kekul\'e ordering are shown
to exhibit anomalous robustness against disorder when the chiral symmetry is
respected.
