  Let H be a full Hilbert bimodule over a C*-algebra A. We show that the
Cuntz-Pimsner C*-algebra associated to H is exact if and only if A is exact.
Using this result, we give alternative proofs for exactness of reduced
amalgamated free products of exact C*-algebras. In the case that A is a finite
dimensional C*-algebra, we also show that the Brown-Voiculescu topological
entropy of Bogljubov automorphisms of the Cuntz-Pimsner algebra associated to
an A,A Hilbert bimodule is zero.
