You said, "Thank you, Dibakar Sen and David Deans, for your excellent comments from my earlier blog."

I want to thank you, Soni, for helping me to better understand and fully appreciate the meaning of the Fast IT model. I'm confident that Cisco's customers also welcome this valuable insight.

Most multinational companies have significant investments in legacy infrastructure, and so I suspect that demand for professional services might increase as they move towards this model. Are there proven network coexistence strategies that might ease the transition?

Do you have some thoughts or guidance for CIOs that will need to orchestrate a frictionless and progressive shift from their current environment to the one that you describe? How are the early adopters of ACI addressing this type of scenario?