  The commuting graph of a finite non-commutative semigroup S, denoted by
\Delta(S), is the simple graph whose vertices are the non-central elements of S
and two distinct vertices x; y are adjacent if xy = yx. In the present paper,
we study various graph-theoretic properties of the commuting graph \Delta(B_n)
of Brandt semigroup B_n including its diameter, clique number, chromatic
number, independence number, strong metric dimension and dominance number.
Moreover, we obtain the automorphism group Aut(\Delta(Bn)) and the endomorphism
monoid End(\Delta(Bn)) of \Delta(Bn). We show that Aut(\Delta(Bn)) = S_n \times
Z_2, where S_n is the symmetric group of degree n and Z_2 is the additive group
of integers modulo 2. Further, for n \geq 4, we prove that End(\Delta(Bn))
=Aut(\Delta(Bn)). In order to provide an answer to the question posed in [2],
we ascertained a class of inverse semigroups whose commuting graph is
Hamiltonian.
