A company needs guaranteed Amazon EC2 capacity in three specific Availability Zones in a specific AWS Region for an upcoming event that will last 1 week. What should the company do to guarantee the EC2 capacity?
A.
Purchase Reserved Instances that specify the Region needed.
B.
Create an On-Demand Capacity Reservation that specifies the Region needed.
C.
Purchase Reserved Instances that specify the Region and three Availability Zones needed.
D.
Create an On-Demand Capacity Reservation that specifies the Region and three Availability Zones needed.
Confirmed! Reserved instances require a fixed one-year or three-year commitment. See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capacity-reservations.html#capacity-reservations-differences
Reserved Instances – Reduce your Amazon EC2 costs by making a commitment to a consistent instance configuration, including instance type and Region, for a term of 1 or 3 years.
Capacity Reservations – Reserve capacity for your EC2 instances in a specific Availability Zone.
***CORRECT***
Option D. Create an On-Demand Capacity Reservation that specifies the Region and three Availability Zones needed.
An On-Demand Capacity Reservation is a type of Amazon EC2 reservation that enables you to create and manage reserved capacity on Amazon EC2. With an On-Demand Capacity Reservation, you can specify the Region and Availability Zones where you want to reserve capacity, and the number of EC2 instances you want to reserve. This allows you to guarantee capacity in specific Availability Zones in a specific Region.
***WRONG***
Option A, purchasing Reserved Instances that specify the Region needed, would not guarantee capacity in specific Availability Zones.
Option B, creating an On-Demand Capacity Reservation that specifies the Region needed, would not guarantee capacity in specific Availability Zones.
Option C, purchasing Reserved Instances that specify the Region and three Availability Zones needed, would not guarantee capacity in specific Availability Zones as Reserved Instances do not provide capacity reservations.
Reserved Instances – Reduce your Amazon EC2 costs by making a commitment to a consistent instance configuration, including instance type and Region, for a term of 1 or 3 years.
Capacity Reservations – Reserve capacity for your EC2 instances in a specific Availability Zone.
do not confuse
A Opção D (Reserva de capacidade sob demanda especificando a região e as zonas de disponibilidade) é a melhor solução, pois garante a capacidade necessária nas zonas de disponibilidade específicas para um evento de curta duração, atendendo ao requisito de forma eficiente e econômica.
Reserved instances offer either a 1 year or 3 year term commitment. So on demand-instances would satisfy the need above. The answer is D , as the question also requires availability zones.
Check out https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capacity-reservations.html#capacity-reservations-differences
Terms for Capacity Reservations: No commitment required. Can be created and canceled as needed.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capacity-reservations.html
"On-Demand Capacity Reservations enable you to reserve compute capacity for your Amazon EC2 instances in a specific Availability Zone for any duration"
Just to avoid any confusion, Reserved Instance also guarantee capacity reservation. However, the reason why we don't need Reserved Instances is because they are reserved for a duration of 1 to 3 years with a lock-in contract (no refunds!). The company is only interested in reserved capacity for a week so D is the best solution.
https://aws.amazon.com/compare/the-difference-between-on-demand-instances-and-reserved-instances/
***CORRECT***
Option D. Create an On-Demand Capacity Reservation that specifies the Region and three Availability Zones needed.
An On-Demand Capacity Reservation is a type of Amazon EC2 reservation that enables you to create and manage reserved capacity on Amazon EC2. With an On-Demand Capacity Reservation, you can specify the Region and Availability Zones where you want to reserve capacity, and the number of EC2 instances you want to reserve. This allows you to guarantee capacity in specific Availability Zones in a specific Region.
Reserved Instances have a commitment over a year so those are out. Option B only allows you to specify the Region and not the AZ.
Therefore, D is the only solution.
its B , On-Demand Capacity Reservation allows you to reserve capacity for Amazon EC2 instances in a specific AWS Region, without specifying specific Availability Zones
D is the correct option to guarantee EC2 capacity in specific Availability Zones for a set timeframe.
On-Demand Capacity Reservations allow you to reserve EC2 capacity across specific Availability Zones for any duration. This guarantees you will have access to those resources.
The most appropriate option to guarantee EC2 capacity in three specific Availability Zones in the desired AWS Region for the 1-week event is to create an On-Demand Capacity Reservation that specifies the Region and three Availability Zones (option D).
A. Purchasing Reserved Instances that specify the Region needed does not guarantee capacity in specific Availability Zones.
B. Creating an On-Demand Capacity Reservation without specifying the Availability Zones would not guarantee capacity in the desired zones.
C. Purchasing Reserved Instances that specify the Region and three Availability Zones is not necessary for a short-term event and involves longer-term commitments.
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