70-347
One to these a reusable so clearly figure out what the network looks like you're going to use that for a wide variety of control tasks so that's reusable figuring out how to do that passed on a particular network topology that's very specific to the task that’s not 70-347 reusable but then telling us which is what you figured out what to do that's reusable those are the two things were going to reuse you now in exactly 40 minutes no everything you need to know about sty. that is St a is the youth at both to control plane abstractions that's all it is so I told you there was no cover so you have the global network you the provide information about the network the way that's typically implemented as with something we call network operating system that's just software running on servers that happen to be placed in the network affording model is the standard way of telling us which how to forward if you've heard about open follow that food the wall open for place it's basically just the way you can tell us which if the packet header looks like this then take this action just two just a standard way of telling about simple.