CLF-C02 Cloud Concepts & AWS Core Services 3 — Questions and Answers
Question 1: A company is evaluating cloud providers and wants to benefit from the massive purchasing power AWS has built through millions of customers. Which cloud advantage does this describe?
- High availability
- Benefit from massive economies of scale (Correct answer)
- Global reach
- Increased agility
Correct answer: Benefit from massive economies of scale
AWS aggregates usage from hundreds of thousands of customers, achieving economies of scale that result in lower pay-as-you-go prices.
Question 2: Which AWS storage class is designed for data that is accessed less than once a month and offers the lowest storage cost in S3?
- S3 Standard
- S3 Standard-IA
- S3 Glacier Deep Archive (Correct answer)
- S3 One Zone-IA
Correct answer: S3 Glacier Deep Archive
S3 Glacier Deep Archive is the lowest-cost S3 storage class, designed for long-term retention of data accessed rarely (once or twice a year).
Question 3: Which AWS networking component acts as a virtual firewall controlling inbound and outbound traffic at the instance level?
- Network ACL
- Security Group (Correct answer)
- Route Table
- Internet Gateway
Correct answer: Security Group
Security Groups are stateful virtual firewalls applied to EC2 instances that control inbound and outbound traffic at the instance level.
Question 4: A company wants to decouple application components so that a failure in one component does not affect others. Which AWS service best supports this pattern?
- Amazon EC2 Auto Scaling
- Amazon SQS (Correct answer)
- Amazon CloudWatch
- AWS CloudTrail
Correct answer: Amazon SQS
Amazon SQS (Simple Queue Service) decouples components by storing messages in a queue, so producers and consumers operate independently.
Question 5: What is an AWS Region?
- A single data center building
- A collection of Availability Zones in a geographic area (Correct answer)
- A global content delivery network edge location
- A logical grouping of AWS accounts
Correct answer: A collection of Availability Zones in a geographic area
An AWS Region is a separate geographic area containing multiple, isolated Availability Zones that are physically separated data centers.
Question 6: Which service provides a fully managed NoSQL key-value and document database with single-digit millisecond performance at any scale?
- Amazon Aurora
- Amazon RDS
- Amazon DynamoDB (Correct answer)
- Amazon ElastiCache
Correct answer: Amazon DynamoDB
Amazon DynamoDB is a fully managed NoSQL database that delivers consistent single-digit millisecond performance regardless of scale.
Question 7: Which AWS pricing model offers the largest discount (up to 90%) compared to On-Demand pricing in exchange for a one- or three-year commitment?
- Spot Instances (Correct answer)
- Reserved Instances
- Savings Plans
- Dedicated Hosts
Correct answer: Spot Instances
Spot Instances use spare AWS capacity and can be up to 90% cheaper than On-Demand, though AWS can reclaim them with a 2-minute warning.
CLF-C02 Cloud Concepts & AWS Core Services 3
A company is evaluating cloud providers and wants to benefit from the massive purchasing power AWS has built through millions of customers.
Which cloud advantage does this describe?