[Solved] You want to create a CloudFormation template that asks for a list of availability zones but only... Which parameter configuration correctly enforces this restriction and allows multiple zones? | AWS

AWS - CloudFormation

You want to create a CloudFormation template that asks for a list of availability zones but only allows zones in us-east-1. Which parameter configuration correctly enforces this restriction and allows multiple zones?

A

"Parameters": { "AZList": { "Type": "List<AWS::EC2::AvailabilityZone::Name>", "AllowedValues": ["us-east-1a", "us-east-1b", "us-east-1c"] } }

B"Parameters": { "AZList": { "Type": "CommaDelimitedList" } }

C"Parameters": { "AZList": { "Type": "List<String>", "Default": "us-east-1a,us-east-1b" } }

D"Parameters": { "AZList": { "Type": "String", "AllowedValues": ["us-east-1a", "us-east-1b", "us-east-1c"] } }

Step-by-Step Solution

Solution:

Step 1: Identify parameter type for multiple AZs
To accept multiple availability zones, use the type List with AWS::EC2::AvailabilityZone::Name for validation.
Step 2: Check AllowedValues for region restriction
AllowedValues limits input to only the specified zones in us-east-1.
Step 3: Evaluate options
"Parameters": { "AZList": { "Type": "List", "AllowedValues": ["us-east-1a", "us-east-1b", "us-east-1c"] } } uses correct List type and AllowedValues. "Parameters": { "AZList": { "Type": "CommaDelimitedList" } } uses CommaDelimitedList but lacks AllowedValues restriction. "Parameters": { "AZList": { "Type": "List", "Default": "us-east-1a,us-east-1b" } } lacks AllowedValues restriction. "Parameters": { "AZList": { "Type": "String", "AllowedValues": ["us-east-1a", "us-east-1b", "us-east-1c"] } } uses String type which accepts only one value.
Final Answer:
"Parameters": { "AZList": { "Type": "List", "AllowedValues": ["us-east-1a", "us-east-1b", "us-east-1c"] } } -> Option A
Quick Check:
List type + AllowedValues restrict multiple inputs [OK]

Quick Trick: Use List type with AllowedValues for multiple restricted inputs [OK]

Common Mistakes:

Using String type for multiple values
Using CommaDelimitedList without proper validation
Not restricting AllowedValues to region zones

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More AWS Quizzes

Which parameter configuration correctly enforces this restriction and allows multiple zones?

Step 1: Identify parameter type for multiple AZs

Step 2: Check AllowedValues for region restriction

Step 3: Evaluate options

Final Answer:

Quick Check:

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