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WorksheetsAWS Cost Optimization Quiz
Total questions: 15
Worksheet time: 8mins
EC2 stopped instance cost – If you stop an EC2 instance, which charges still apply?
None
EBS + Elastic IP
Full compute
Only 50%
EC2 Spot vs Reserved – A batch job runs 2 hours daily. Which is cheapest?
On-Demand
Spot
Reserved
Dedicated
EC2 right-sizing – An m5.4xlarge runs at 8% CPU. What’s the issue?
No issue
Paying for unused capacity
AWS auto-scales
Pay per utilization
EC2 Inter-AZ transfer – Two instances in different AZs exchange data. Cost impact?
Free
Inter-AZ transfer charged
Compute cost only
Free in same VPC
S3 storage class – A backup is kept in S3 Standard for 1 year. Best optimization?
Standard
IA
Intelligent-Tiering
Glacier Deep Archive
S3 lifecycle – What reduces cost for unpredictable access?
Glacier
Intelligent-Tiering
S3 Standard
Multi-Region
Lambda cost factor – Lambda billed for?
Memory only
Time only
Requests + time × memory
Requests only
Lambda networking – Which setup incurs more cost?
Public subnet
Private subnet + NAT
Edge function
None
RDS Multi-AZ – What is the trade-off?
Cheaper + Resilient
More costly + Resilient
Cheaper + Slower
Free
DynamoDB mode – Steady 200 RCU/WCU workload. Best mode?
On-Demand
Provisioned with Auto Scaling
Global Tables
DAX
Redshift serverless – Which avoids idle cluster cost?
Provisioned cluster
Redshift Serverless
Spectrum
RA3
Athena cost driver – Athena is charged by?
Query runtime
Data scanned
Instance time
Data stored
CloudWatch logs – Keeping logs “never expire” leads to?
No impact
Rising cost over time
Free tier
One-time charge
CloudFront cache – Missing cache headers cause?
Free access
More origin costs
Lower latency
Cheaper egress
EBS snapshots – What happens if you delete an instance but not its snapshots?
No cost
Snapshots billed until deleted
Free after 30 days
Auto deleted
