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"Which service provides the best scalability for unpredictable traffic?"
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Which AWS service automatically adjusts the number of EC2 instances based on demand?
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Understanding the right approach
EC2 Auto Scaling is the correct answer because it automatically adjusts the number of EC2 instances based on demand. Auto Scaling monitors your application and automatically adds or removes instances to maintain performance and minimize costs. This service is essential for handling unpredictable traffic patterns. When demand increases, Auto Scaling launches additional instances. When demand decreases, it terminates unnecessary instances, ensuring you only pay for what you need.
Auto Scaling uses CloudWatch metrics (like CPU utilization or custom metrics) to trigger scaling actions. You can configure target tracking policies, step scaling, or scheduled scaling to match your application's needs.
With manual scaling, you must manually launch or terminate instances, which can take minutes or hours. This approach is inefficient for handling sudden traffic spikes and often results in over-provisioning to handle peak loads, wasting money during off-peak hours.
While ELB is crucial for distributing traffic across multiple instances, it doesn't add or remove instances automatically. You still need Auto Scaling to adjust capacity. ELB and Auto Scaling work together - ELB distributes traffic while Auto Scaling manages capacity.
CloudWatch collects and tracks metrics, but it's only the monitoring component. You need Auto Scaling to act on those metrics. CloudWatch provides the data (CPU usage, network traffic), while Auto Scaling makes the scaling decisions based on that data.
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