CLF-C02 Question #16: Real Exam Question with Answer & Explanation

Question

Which of the following is a way to use Amazon EC2 Auto Scaling groups to scale capacity in the AWS Cloud?

Options

• AScale the number of EC2 instances in or out automatically, based on demand.
• BUse serverless EC2 instances.
• CScale the size of EC2 instances up or down automatically, based on demand.
• DTransfer unused CPU resources between EC2 instances.

Explanation

EC2 Auto Scaling Groups Explanation

Option A is correct because EC2 Auto Scaling groups are specifically designed to automatically add (scale out) or remove (scale in) EC2 instances based on defined policies, schedules, or demand metrics like CPU utilization - this is their core purpose.

The distractors are wrong because:

• Option B is incorrect because "serverless EC2 instances" is not a real concept; serverless computing refers to services like AWS Lambda, not EC2
• Option C is incorrect because Auto Scaling adjusts the number of instances (horizontal scaling), not the size of existing instances - changing instance size is called vertical scaling and is done manually or through other means
• Option D is incorrect because transferring CPU resources between instances is not a feature that exists in AWS; each EC2 instance has its own dedicated or shared resources depending on type

Memory Tip: Think of Auto Scaling like a restaurant staffing schedule - you call in more servers (scale out) during the dinner rush and send servers home (scale in) during slow hours. You're changing the count, not the size of the servers! 🍽️

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