Architecting on AWS Certification Architecting on AWS Certification Cost Optimization & Performance Efficiency 3

Question 1

Which Amazon EC2 feature allows multiple instance types to be used within the same Auto Scaling group, enabling lower cost by mixing On-Demand and Spot capacity?

Accepted Answer

Mixed Instances Policy

Answer

Mixed Instances Policy in Auto Scaling lets you specify multiple instance types and blend On-Demand and Spot Instances to optimize cost and availability simultaneously.

Question 2

An architect is choosing between Amazon EBS gp2 and gp3 volumes. Which statement about gp3 is correct from a cost and performance perspective?

Accepted Answer

gp3 is cheaper than gp2 and allows IOPS and throughput to be configured independently

Answer

gp3 volumes are approximately 20% cheaper than gp2 per GB-month and allow you to provision up to 16,000 IOPS and 1,000 MB/s throughput independently of volume size.

Question 3

What is the purpose of Amazon S3 Intelligent-Tiering storage class?

Accepted Answer

To automatically move objects between access tiers based on changing access patterns, optimizing cost

Answer

S3 Intelligent-Tiering monitors object access and automatically moves objects between Frequent and Infrequent Access tiers (and archive tiers) to save costs without performance impact.

Question 4

An architect wants to improve the read performance of a relational database without scaling the primary instance. Which AWS solution achieves this?

Accepted Answer

Add RDS Read Replicas and direct read traffic to them

Answer

RDS Read Replicas asynchronously replicate data from the primary and allow read-heavy workloads to offload queries, improving overall throughput without upgrading the primary instance.

Question 5

Which performance pillar best practice involves choosing the right AWS storage type for an I/O-intensive OLTP database workload?

Accepted Answer

Using Amazon EBS Provisioned IOPS (io1/io2) volumes for consistent, low-latency I/O

Answer

Provisioned IOPS EBS volumes (io1/io2) deliver consistent, low-latency performance and are specifically designed for I/O-intensive OLTP databases requiring predictable IOPS.

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Architecting on AWS Certification Cost Optimization & Performance Efficiency 3