Which of the following statements is incorrect in reference to scalable architecture?

In the most recent company meeting, your CEO focused on the fact that everyone in the organization needs to make sure that all of the infrastructure that is built is truly scalable.

Which of the following statements is incorrect in reference to scalable architecture?
A . A scalable service is capable of handling heterogeneity.
B . A scalable service is resilient.
C . A scalable architecture won’t be cost effective as it grows.
D . Increasing resources results in a proportional increase in performance.

Answer: C

Explanation:

In AWS it is critical to build a scalable architecture in order to take advantage of a scalable infrastructure. The cloud is designed to provide conceptually infinite scalability.

However, you cannot leverage all that scalability in infrastructure if your architecture is not scalable. Both have to work together. You will have to identify the monolithic components and bottlenecks in your architecture, identify the areas where you cannot leverage the on-demand provisioning capabilities in your architecture, and work to refactor your application, in order to leverage the scalable infrastructure and take advantage of the cloud.

Characteristics of a truly scalable application:

Increasing resources results in a proportional increase in performance

A scalable service is capable of handling heterogeneity

A scalable service is operationally efficient

A scalable service is resilient

A scalable service should become more cost effective when it grows (Cost per unit reduces as the number of units increases)

Reference: http://media.amazonwebservices.com/AWS_Cloud_Best_Practices.pdf