Architecting on AWS Certification Welding Procedures & Techniques 4

Question 1

A company runs a batch job that processes data for 6 hours every night and can tolerate interruption. Which EC2 purchasing option minimizes cost?

Accepted Answer

Spot Instances

Answer

Spot Instances offer up to 90% discount compared to On-Demand and are ideal for fault-tolerant batch workloads.

Question 2

Which S3 feature automatically moves objects to cheaper storage classes based on access patterns without predefined rules?

Accepted Answer

S3 Intelligent-Tiering

Answer

S3 Intelligent-Tiering monitors access and moves objects between tiers automatically, optimizing cost without retrieval fees.

Question 3

An architect wants to reduce NAT Gateway data-processing costs for EC2 instances that frequently access S3. What is the best solution?

Accepted Answer

Create a VPC Gateway Endpoint for S3

Answer

A VPC Gateway Endpoint for S3 routes traffic over AWS's private network, bypassing the NAT Gateway and eliminating its cost.

Question 4

Which AWS Compute Optimizer metric indicates that an EC2 instance is over-provisioned and should be downsized?

Accepted Answer

Consistently low CPU and memory utilization over the lookback period

Answer

Consistently low CPU and memory utilization signals that the instance is larger than the workload requires.

Question 5

A team wants to share a single Amazon RDS instance across multiple development environments to save cost. What is a key risk of this approach?

Accepted Answer

A noisy workload in one environment can degrade performance for all others

Answer

Shared compute resources mean one environment's heavy queries can starve CPU and I/O for all other environments.

Architecting on AWS Certification Practice Test