[Solved] You wrote this AWS CLI command to associate an Elastic IP but it fails:aws ec2 associate-address --instance-id i-1234567890abcdef0 --allocation-id eipalloc-12345678What is a possible error? | AWS

AWS - EC2 Fundamentals

You wrote this AWS CLI command to associate an Elastic IP but it fails:
aws ec2 associate-address --instance-id i-1234567890abcdef0 --allocation-id eipalloc-12345678
What is a possible error?

AThe allocation ID is invalid syntax

BThe instance is in a different VPC than the Elastic IP allocation

CThe instance ID is missing a region prefix

DThe command requires a public IP instead of allocation ID

Step-by-Step Solution

Solution:

Step 1: Understand association requirements
Elastic IPs allocated for a VPC must be associated with instances in the same VPC.
Step 2: Evaluate other options
Allocation ID syntax is correct; instance ID format is valid; command uses allocation ID correctly.
Final Answer:
The instance is in a different VPC than the Elastic IP allocation -> Option B
Quick Check:
Elastic IP and instance must be in same VPC [OK]

Quick Trick: Elastic IP and instance must share the same VPC [OK]

Common Mistakes:

MISTAKES

Ignoring VPC mismatch
Thinking allocation ID syntax is wrong
Confusing instance ID format requirements

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You wrote this AWS CLI command to associate an Elastic IP but it fails:

Step 1: Understand association requirements

Step 2: Evaluate other options

Final Answer:

Quick Check:

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