![]() So you just let me in two seconds ago, don't you remember? I came in, I said hi, I'm wearing a blue jacket, I walked over there, went, forgot my coffee. You go, well, sorry, you're not wearing a blue jacket. And you go, wait! And you go, what? Now Bill, when he went inside, happened to take his blue jacket off. ![]() So Bill tiptoes out, grabs his coffee, comes back and says, hi. And then Bill, for whatever reason realized that he left something, his coffee out on the street. And you go, hi, Bill, blue jacket, let's you in. Now let's say some guy, Bill, comes in and he's wearing the blue jacket. So you're programmed to just look, blue jacket, you got it on, go ahead in. If they are wearing a blue jacket, you let them in. When somebody comes in, you say, are you wearing a blue jacket? If they're not wearing a blue jacket, you send them off. So imagine me as a guard in a building and I'm told, I say, listen, here's what you're going to do. Some devices just have programmability that in some sense is referred to as being context-free. Like having the ability to capture and use state to have memory, to be able to count something, or say, I saw this before. ![]() ![]() ![]() If I want to freeze frame memory in a computer, or freeze frame something, some aspect of memory, just remember it, freeze it and use it in some subsequent state, then that's called being stateful. So a state is something you can think of as like a snapshot. And the two types are ones that either have some ability to remember or not, and the thing we're going to remember is something that a computer scientist would refer to as a state. So we'll keep it general and then we'll hone in on how this works for a firewall. And I want to talk to you about two different types of computing devices and ultimately two different kinds of firewalls, but think it's true just about any device. ![]()
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