A Company Hosts a Blog Post Application on AWS Using

question 278

Multiple Choice

A company hosts a blog post application on AWS using Amazon API Gateway, Amazon DynamoDB, and AWS Lambda. The application currently does not use API keys to authorize requests. The API model is as follows: GET / posts/[postid] to get post details GET / users[userid] to get user details GET / comments/[commentid] to get comments details The company has noticed users are actively discussing topics in the comments section, and the company wants to increase user engagement by marking the comments appears in real time. Which design should be used to reduce comment latency and improve user experience?

• A) Use edge-optimized API with Amazon CloudFront to cache API responses.
• B) Modify the blog application code to request GET comment[commented] every 10 seconds.
• C) Use AWS AppSync and leverage WebSockets to deliver comments.
• D) Change the concurrency limit of the Lambda functions to lower the API response time.

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Definitions:

Cellular Respiration

The process by which cells produce energy from carbohydrates; oxygen is consumed as a reactant along with the organic fuel.

Calvin Cycle

A series of biochemical redox reactions that take place in the stroma of chloroplasts in photosynthetic organisms.

Glycolysis

The process of breaking down glucose into pyruvate, yielding energy in the form of ATP, within cells under anaerobic or aerobic conditions.

Chemiosmosis

The movement of ions across a semipermeable membrane, down their concentration gradient, which is used to generate ATP in cells.