What is the core concept behind On-Demand EC2 instances?
A.)Pay a fixed monthly fee regardless of usage
B.)Pay only when you use it — pay-as-you-go
C.)Reserve capacity for 1 or 3 years upfront
D.)Use AWS's unused servers at discounted rates

b

Spot Instances use which type of AWS infrastructure to offer steep discounts?
A.)Dedicated physical servers
B.)Reserved capacity pools
C.)AWS's unused/spare compute capacity
D.)Scheduled maintenance windows

a

Which Reserved Instance type allows you to change the instance family, size, or OS during the term?
A.)Standard Reserved Instance
B.)Scheduled Reserved Instance
C.)Capacity Reservation
D.)Convertible Reserved Instance

d

What is a key difference between Capacity Reservation and Standard Reserved Instances?
A.)Capacity Reservation gives 90% discount; Standard gives 60%
B.)Capacity Reservation guarantees server capacity with no discount — you pay even if unused
C.)Standard Reserved gives a capacity guarantee; Capacity Reservation does not
D.)Capacity Reservation only works in the US-East-1 region

c

what is node?

node is open source asynchronous evev jawa script runtime environment built onchrome