I believe that at this point in time any network traversal should be considered an ultrahazardous activity. As most networks are beyond the control of the users and have little to no change control, it makes little sense to apply risk mitigation controls to them. When you consider the fact that users demand their information be available at all times, it makes much more sense, from a risk mitigation perspective, to focus on the elements you do have a semblance of control over -- the endpoints where the sensitive data is stored and processed and the protocols by which they communicate. There are well known and trusted means of securing data in transit. There is no excuse for relying on policy for mitigation where your policy can have no effect.