The CRC in TCP is weak. CRCs can be made arbitrarily powerful and still retain their key advantage: they can be computed independently and then combined when co

The CRC in TCP is weak. CRCs can be made arbitrarily powerful and still retain their key advantage: they can be computed independently and then combined when concatenating the parts. That key advantage, combined with a strong CRC, is what provides an elegant solution to the 2-pass problem.