However I wasn't implying in the piece that DBAs should learn about IP networking. If you have people doing those jobs, inspire/motivate/ping them to learn more about their craft and better secure your systems.
I agree, because in the end it makes you more marketable in the work place. However, in todays work place SARBOX standards tends to demarcate job descriptions a lot more, and when you deal with companies that come under SARBOX standards you have to be very aware of this or otherwise you could find yourself in some trouble with auditors learning/doing someone elses job description.:-D
"Technology is a weird thing. It brings you great gifts with one hand, and it stabs you in the back with the other. ...:-D"