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You launch an r5.large instance but notice it has less memory than expected. What could be the problem?

medium📝 Debug Q7 of 15
AWS - EC2 Fundamentals
You launch an r5.large instance but notice it has less memory than expected. What could be the problem?
AYou selected an r5.large instance with a custom AMI that limits memory
BYou launched an r5.large spot instance with limited memory
CYou accidentally launched an r5.large instance in a Nitro-based host with reduced memory
DYou launched an r5.large instance type but selected a smaller size like r5.large.xsmall
Step-by-Step Solution
Solution:

  1. Step 1: Understand instance memory specs

    r5.large has fixed memory; spot or Nitro hosts do not reduce memory.

  2. Step 2: Consider AMI impact

    Custom AMIs can limit usable memory via OS or configuration.

  3. Final Answer:

    You selected an r5.large instance with a custom AMI that limits memory -> Option A

  4. Quick Check:

    Custom AMIs can affect memory availability [OK]
Quick Trick: Custom AMIs may limit instance memory [OK]
Common Mistakes:
  • Confusing instance size naming
  • Assuming spot instances reduce memory

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