Chapter 9 – Monitoring and Troubleshooting Networks in AWS

1. Standard, detailed, and custom.
2. True.
3. The logs are kept indefinitely.
4. Use billing alarms and create alerts when the budget has exceeded 50%, 80%, and 100%. Make sure that the alert notifies the developers through an SNS subscription.
5. Yes, this is supported.
6. Not with CloudWatch, you need to use a third-party tool as CloudWatch is regionally bound.

7. A security group or NACL is denying traffic to the instance.
8. You are not waiting for the operating system to start. Wait five minutes and then try again. If there is no response, then check the security group and NACL.
9. The TTL on the record is set too high and you need to lower it. The clients also need to flush their resolver cache.