  We report the structural, magnetic, exchange bias and magnetotransport effect
in Sr$_{4}$Fe$_{3}$CoO$_{11}$. The material crystallizes in the orthorhombic
$\textit{Cmmm}$ space group. It shows antiferromagnetic (G-type) transition
(T$_{N}$ = 255 K) along with interesting temperature induced magnetization
reversal (T$_{Comp.}$= 47 K measured at 100 Oe). The magnetic reversal can be
elucidated considering the increased magnetocrystalline anisotropy with Co
substitution. Magnetoresistance measurements shows an interesting crossover
from negative to positive side at $\sim$ 100 K. The negative magnetoresistance
reaches 80 $\%$ at 25 K in 7 T magnetic field. Giant exchange bias effect is
observed below T$_{N}$ under field cooling condition. The origin of the
negative magnetoresistance and giant exchange bias in this sample can be
attributed to the magnetic frustration.
