Answer: Non, je ne le connais pas.
Step-by-step explanation:
If the noun you are replacing is masculine (ce is a clue) replace it with the masculine pronoun: le
For a feminine noun (cette would be the clue) use the feminine pronoun: la
For plural, (ces would be the demonstrative pronoun) use les
Coincidentally, in French, the direct object pronouns are identical to the definite articles that would be used with the nouns.