Yes, I'll start. This is Karl. Yes, John tried. Our focus has been the application. I mean, that started when we acquired Magnifire 10 years ago to focus on web application firewalling. And with that, we integrated that as part of our BIG-IP portfolio because we needed -- we wanted the scalability, and we've significantly added to its capabilities along the line, but the focus has been on the application. Then we added things like APM for doing things like remote access, single sign-on, build the front-end applications. And the more general discussion around security is that because we sit in the data center, and because we interact at the transactional level, we're a proxy and we're able to see both sides of the transaction, both from the client and back from the server, and understand the context of the application, we can imply -- we can apply intelligence to that connection that other security devices can't do, such as like a Palo Alto, which sits at the perimeter, which is doing distinctly different types of security services, whereas, we're focused, again, back at the application tier. There's other things that we do there as well. For example, now, we acquired Versafe to provide antifraud services. Again, because we're involved with the transactions, with the fraud -- in between the client and the server, we're able to form a trusted connection with the client dynamically and then send certain conditions and then prevent and detect these different conditions as part of that. And so our focus on security has been effectively preventing attacks against applications. Now we're extending our footprint in the data center, meaning providing other types of security, and you'll see more of that. We're advancing our DDoS capabilities. We're looking at ways to provide risk assessment, other advanced analytics as part of that, and we'll extend from there.