AWS Certified Solutions Architect EC2 Instance Types and Cost 3

Question 1

A web application experiences predictable traffic spikes every weekday from 9 AM to 6 PM. Which Reserved Instance offering type provides the most savings for this scheduled pattern?

Accepted Answer

Scheduled Reserved Instances

Answer

Scheduled Reserved Instances let you reserve capacity for specific time windows, matching predictable recurring workloads at lower cost.

Question 2

Which EC2 instance family uses AWS Graviton processors and is known for delivering the best price-performance ratio for general-purpose workloads?

Accepted Answer

M6g instances

Answer

M6g instances use AWS Graviton2 ARM-based processors and offer up to 40% better price-performance than comparable x86 instances.

Question 3

A database server needs consistent, high CPU performance without throttling at any time. The workload runs at 70% CPU continuously. Which instance type is most appropriate?

Accepted Answer

M5 general purpose instance

Answer

M5 instances provide consistent full-core CPU performance without bursting credits, suited for sustained high-CPU workloads.

Question 4

What is the primary difference between an EC2 Dedicated Host and a Dedicated Instance?

Accepted Answer

Dedicated Hosts give visibility and control over the physical server, Dedicated Instances do not

Answer

Dedicated Hosts provide visibility into sockets and cores on the physical server (required for some BYOL licenses), while Dedicated Instances only guarantee hardware isolation.

Question 5

A solution architect needs to run a stateless web tier that scales from 2 to 50 instances based on load. Which purchasing strategy minimizes cost while ensuring baseline availability?

Accepted Answer

Reserved Instances for baseline + Spot for scale-out

Answer

Using Reserved Instances for the predictable minimum capacity and Spot Instances for burst scaling is the standard cost-optimized architecture.

AWS Practice Test

AWS Practice Test

AWS Certified Solutions Architect EC2 Instance Types and Cost 3