>if you have insufficient funds they'll take out a margin loan
That's not my experience with them. I've had them as a checking/brokerage account for 10+ years. I tend not to keep much money in checking so I run into timing issues once a year or so - where a check I wrote will present before the funds to cover it arrive in my account. I've definitely had them pull from the brokerage cash, but not from savings. They have never opened a margin loan to cover it.
Yes and no. NACLs are, indeed, associated with a subnet so more of a networking construct. It's somewhat a firewall, but it's also stateless which is different than many (non-network engineer) people's mental model of a firewall.
Security Groups have some key differences from a host-based firewall. A packet destined for an EC2 instance will not make it to the instance IP stack and be evaluated there, it will be evaluated before it gets there.
It depends on your audience. A web dev that's relatively new to syadmin tasks... sure, it's like a host based firewall. For a syadmin or network admin, that explanation might be more confusing than helpful.
I found the Associate level good for directed learning. I learned about some facets of services I hadn't been aware of and gained exposure to services I hadn't used for projects to date. It was my first cert in ~20 years of IT (sysadmin and dev), FWIW.
I've heard, as another poster pointed out, that the Professional level certs are well regarded. Associate, eh.
No one ever comes out and says "You were hired on the basis of a cert". It's just another factor. If you've got the experience they're probably not worth as much. If you don't, they'll help.
SysAdmin, been doing web dev (Java) for the last couple of years. Looking to get back to the Ops side of things. MBA and AWS Solutions Architect Associate.
That's not my experience with them. I've had them as a checking/brokerage account for 10+ years. I tend not to keep much money in checking so I run into timing issues once a year or so - where a check I wrote will present before the funds to cover it arrive in my account. I've definitely had them pull from the brokerage cash, but not from savings. They have never opened a margin loan to cover it.