  Topological nodal-line semimetals support protected band crossings which form
nodal lines or nodal loops between the valence and conduction bands and exhibit
novel transport phenomena. Here we address the topological state of the
nodal-line semimetal candidate material, CaCdSn, and report magnetotransport
properties of its single crystals grown by the self-flux method. Our
first-principles calculations show that the electronic structure of CaCdSn
harbors a single nodal loop around the $\Gamma$ point in the absence of
spin-orbit coupling (SOC) effects. The nodal crossings in CaCdSn are found to
lie above the Fermi level and yield a Fermi surface that consists of both
electron and hole pockets. CaCdSn exhibits high mobility ($\mu \approx
3.44\times 10^4$ cm$^2$V$^{-1}$s$^{-1}$) and displays a field-induced
metal-semiconductor like crossover with a plateau in resistivity at low
temperature. We observe an extremely large and quasilinear non-saturating
transverse as well as longitudinal magnetoresistance (MR) at low temperatures
($\approx 7.44\times 10^3 \%$ and $\approx 1.71\times 10^3\%$, respectively, at
4K). We also briefly discuss possible reasons behind such a large quasilinear
magnetoresistance and its connection with the nontrivial band structure of
CaCdSn.
