A/UX 2.0: MacTCP and "native TCP/IP"

Does MacTCP use the A/UX 2.0 "native TCP/IP"?

Under A/UX 2.0, MacTCP maps its calls to the "native TCP/IP" calls available
under A/UX.

MacTCP maintains the same API in both A/UX and the Macintosh OS, but under
A/UX, MacTCP is merely a front end to the existing implementation of TCP/IP.
Published Date: Feb 18, 2012