You want to combine Spot Instances with On-Demand Instances to balance cost and availability for a web application. What is the best architectural approach?

hard📝 Architecture Q9 of 15

AWS - Cost Optimization

AUse an Auto Scaling group with mixed instances policy combining Spot and On-Demand

BLaunch Spot Instances only and manually add On-Demand when needed

CUse On-Demand Instances only to avoid interruptions

DRun Spot Instances in one region and On-Demand in another without load balancing

Step-by-Step Solution

Solution:

Step 1: Understand mixed instance policies
Auto Scaling groups can use mixed policies to combine Spot and On-Demand.
Step 2: Benefits of mixed policy
This approach balances cost savings and availability automatically.
Final Answer:
Use an Auto Scaling group with mixed instances policy combining Spot and On-Demand -> Option A
Quick Check:
Mixed Auto Scaling = Cost + availability balance [OK]

Quick Trick: Use mixed Auto Scaling groups for Spot + On-Demand [OK]

Common Mistakes:

Manually managing instance types instead of mixed policy
Ignoring availability needs by using Spot only
Not using load balancing across regions

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More AWS Quizzes

You want to combine Spot Instances with On-Demand Instances to balance cost and availability for a web application. What is the best architectural approach?

Step 1: Understand mixed instance policies

Step 2: Benefits of mixed policy

Final Answer:

Quick Check:

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