An Application Is Running on Amazon EC2 Instances Behind an Application

question 629

Multiple Choice

An application is running on Amazon EC2 instances behind an Application Load Balancer (ALB) . The instances are configured in an Amazon EC2 Auto Scaling group. A SysOps Administrator must configure the application to scale based on the number of incoming requests. Which solution accomplishes this with the LEAST amount of effort?

• A) Use a simple scaling policy based on a custom metric that measures the average active requests of all EC2 instances
• B) Use a simple scaling policy based on the Auto Scaling group GroupDesiredCapacity metric Use a simple scaling policy based on the Auto Scaling group GroupDesiredCapacity metric
• C) Use a target tracking scaling policy based on the ALB's ActiveConnectionCount metric Use a target tracking scaling policy based on the ALB's ActiveConnectionCount
• D) Use a target tracking scaling policy based on the ALB's RequestCountPerTarget metric RequestCountPerTarget

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Definitions:

Descriptive Statistics

Statistical methods that summarize and organize the characteristics of a data set, including measures such as mean, median, and standard deviation.

Population

A complete set of elements (people, objects, transactions, etc.) that share at least one common characteristic.

AVERAGE(range)

A function used in spreadsheet software to calculate the arithmetic mean of a range of cells.

Mean Value

The average of a set of numbers, found by dividing the sum of all values by the number of values.