How does AWS reconfigure it's network infrastructure on-the-fly?

Adding to David's comment. Definitely check out the later version of that same talk because it does go into detail about how AWS builds the network that customers use. But also check out James Hamilton's Innovation at Scale video which is older but goes into other detail including EC2, EBS, etc.

There are dozens (if not more) videos on YouTube that go into our technology in depth. Consider reading the Amazon Builder's Library because it talks to a lot of the lessons and patterns that we use at scale.

Of course, there are many things we don't talk about because they are unique to AWS. But as a customer you should talk to your local AWS Solutions Architect - they may be able to answer more specific questions.