More question answered from an AWS course.

  • Does the AWS ELB have the ability to throttle requests, to stop invalid/illegal traffic – if someone refreshes a page 10 times in 5 seconds and I want to block the unnecessary requests from the refreshes?
  • What is the availability of the ELB component?
    • I couldn’t find firm numbers, but here’s an interesting article about ELB best practices.
  • In a DDOS attack, since there is a lot of traffic to your environment, do you get charged for the additional traffic?
    • Depending on the attack type, not if you are fronted by an ELB or set up your security groups/NACLs to discard the traffic.  From the DDOS whitepaper: “When [an ELB detects certain types of attacks], it will automatically scale to absorb the additional traffic but you will not incur any additional charges.”
  • When an instance is decommissioned from an ASG, does the ELB know not to send new sessions to that ASG because the instance is getting ready to shut down?

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