FRISCO, Texas -- After five games, what is the Dallas Cowboys' defense?
Is it the group that suffocated the New York Giants, New York Jets and New England Patriots?
Is it the unit that got run over by the Arizona Cardinals in Week 3 and trucked by the San Francisco 49ers last week?
The strength of the 3-2 Cowboys is supposed to be their defense, but as they enter Monday's game against the 2-2 Los Angeles Chargers (8:15 p.m. ET, ABC/ESPN) there are questions about just how good they are and how good they can be.