Today, I was working at the HQ of a major UK telco. I connected my personal MBP to a random ethernet cable and lo, I could RDP on servers and do everything I wanted, without any prior authorisation. If you think all enterprise networks are as locked down as the ones found in banks, you're sorely mistaken. BYOD is a reality.
Which would be nice, if we had the hardware of today with the IT practices of a time when enterprises might exert centralized control of departmental server purchases but not exert the same control over individual desktop system purchases and even the software installation on those desktops.