Practice Test 1 | AWS Certified Solutions Architect Associate | SAA-C03 | Dumps | Mock Test

Explanation:

Answer – D and E

Option D- US West 2a-6 , US West 2b – 6, US West 2c-0

• If US West 2a goes down, we will still have 6 instances running in US West 2b.
• If US West 2b goes down, we will still have 6 instances running in US West 2a.
• If US West 2c goes down, we will still have 6 instances running in US West 2a, 6 instances running in US West 2b.

Option E- US West 2a-3 , US West 2b – 3, US West 2c-3

• If US West 2a goes down, we will still have 3 instances running in US West 2b and 3 instances running in US West 2c.
• If US West 2b goes down, we will still have 3 instances running in US West 2a and 3 instances running in US West 2c.
• If US West 2c goes down, we will still have 3 instances running in US West 2a and 3 instances running in US West 2b.

Option A is incorrect because, even if one AZ becomes unavailable, we will only have 4 instances available. This does not meet the specified requirements.

Option B is incorrect because, when either us-west-2a or us-west-2b is unavailable, you would only have 3 instances available. This does not meet the specified requirements.

Option C is incorrect because, if us-west-2a becomes unavailable, you would only have 4 instances available. This also does not meet the specified requirements.

For more information on AWS Regions and Availability Zones, please visit the following URL:

• https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.RegionsAndAvailabilityZones.html

Note: 
In this scenario, we need to have 6 instances running all the time, even when 1 AZ is down.

Hence options D & E are correct.