SAP-C02 Design for New Solutions Practice Question
Network Topology
Refer to the exhibit. A solutions architect is designing a new application that requires three EC2 instances running in different Availability Zones in us-east-1. The architect runs the AWS CLI command shown and sees three instances running in three AZs. However, the application is not highly available because if one AZ fails, the application loses one-third of its capacity. The architect needs to ensure that the application can survive the loss of an entire AZ without manual intervention. What should the architect do?
⚠ Common exam trap
A common mix-up: candidates confuse EC2 Auto Recovery (which recovers a single instance within the same AZ) with Auto Scaling groups (which can replace instances across multiple AZs), leading them to choose Option C even though it cannot handle an entire AZ failure.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an Auto Scaling group with a minimum size of 2 and a maximum size of 6, spread across three AZs.
An Auto Scaling group with a minimum size of 2 and a maximum size of 6, spread across three Availability Zones, ensures that if one AZ fails, the Auto Scaling group automatically launches replacement instances in the remaining healthy AZs to maintain the desired capacity. This provides fault tolerance without manual intervention, as the group continuously monitors instance health and replaces failed instances across AZs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a launch configuration and manually associate it with the instances.
Why it's wrong here
Does not provide auto recovery.
- ✓
Create an Auto Scaling group with a minimum size of 2 and a maximum size of 6, spread across three AZs.
Why this is correct
Auto Scaling automatically replaces failed instances.
- ✗
Use EC2 Auto Recovery to automatically recover instances in case of failure.
Why it's wrong here
Auto Recovery only recovers the same instance, not across AZs.
- ✗
Manually launch additional instances in other AZs.
Why it's wrong here
Manual intervention is required, not automated.
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Senior Network & Security Engineer · founder of Courseiva
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