'Total nonsense. 1. Ethernet is no more complex than USB at any layer. 2. If Ethernet had been implemented, it is likely it would not have been impolemented at the IP layer. There would be no real need. More likley it would have been implemented at layer 2, and the TA would not have participated at the IP layer at all. 3. Security at layer 2 would not be required. There is little or no point. 4. USB is not fundamentally any more secure than Ethernet. 5. Implementing security in a USB device carries precisely the same requirements as in an Ethernet device.