What is an AWS Dedicated Host, and how is it different from a Dedicated Instance?
In a dedicated instance only one AWS customers instance will be running on the hardware of the AWS cloud, whereas in the case of dedicated host you can buy the underlying physical hardware from Amazon cloud
What are the different payment options available for Reserved Instances?
three types of payment options are available for reserved instance
1.no upfront
2.partial upfront
3.full upfront
What does the “pending” state mean in EC2? Can you access the instance during this time?
In Pending state means its not assigned with any server similar to stopped state so we can't access SSH/RDP when the instance in pending state.
What is the difference between a Standard RI and a Convertible RI? When would you use each?
Standard Reserved Instances (RIs) offer the highest discounts but are inflexible, while Convertible RIs provide less discount but allow for changes to instance attributes during the term.
If you purchase a Capacity Reservation and do not use it, are you still billed? What is the billing model for unused reserved capacity?
Yes, even if you purchase a capacity reservation and don't use it, you will still be billed for the reserved capacity, as you are essentially paying for the guarantee of availability, not just the usage.You pay for the reserved capacity, not just the actual usage, meaning you are billed even if the reserved capacity is idle.