Solution Concentration — Definition & Overview

When a salt is dissolved in water, it dissociates. That is to say, it splits into it's component ions. $$NaCl \rightarrow Na^{+}+Cl^{-}$$ If one mole of $NaCl$ is dissolved in a liter of water, what is the concentration of $Na^{+}$? Is it the same as the concentration of $Cl^{-}$? Assume the final volume is the same as the initial volume.