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

Placement groups

Answer

Dedicated Tenancy

Answer

Burstable instances

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 is more expensive but offers guaranteed IOPS

Answer

gp3 has lower maximum IOPS than gp2

Answer

gp3 requires Multi-Attach to improve performance

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

To provide the lowest possible latency for all S3 objects

Answer

To replicate objects across three Regions automatically

Answer

To encrypt all stored objects by default

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

Enable Multi-AZ on RDS

Answer

Increase the RDS instance storage

Answer

Enable automated backups

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

Using S3 for all database files

Answer

Using instance store for the OS and EBS for logs only

Answer

Using EFS for shared database storage

Question 6

An architect is deploying a content-heavy website and wants to reduce origin server load. After enabling CloudFront, which cache behavior setting maximizes cache hit ratio?

Accepted Answer

Minimize the number of headers and query strings forwarded to origin

Answer

Forward all headers and query strings to origin

Answer

Disable caching entirely for dynamic pages

Answer

Set the TTL to 0 for all objects