Serverless

Question 1

developers don’t have to manage servers anymore they just deploy code, functions

Answer 1

Serverless

Question 2

• AWS Lambda
• DynamoDB
• AWS Cognito
• AWS API Gateway
• Amazon S3
• AWS SNS & SQS
• AWS Kinesis Data Firehose
• Aurora Serverless
• Step Functions
• Fargate

Answer 2

All serverless services

Question 3

Virtual functions limited by time tthat run on-demand

Answer 3

Lambda

Question 4

First 1,000,000 requests are free, $0.20 per 1 million requests thereafter

Answer 4

Lambda

Question 5

Max execution time of a lambda function

Answer 5

15 minutes

Question 6

A code that you write and attach to CloudFront distributions that runs close to your users to minimize latency

Answer 6

Edge Function

Question 7

Lightweight functions written in JavaScript for high-scale, latency-sensitive CDN customizations that allow millions of requests/second with Sub-ms startup times

Answer 7

CloudFront Functions

Question 8

functions written in NodeJS or Python that scales to 1000s of requests/second

Answer 8

Lambda@Edge

Question 9

Does Lambda@Edge trigger from Origin Request/Response

Answer 9

Yes

Question 10

CloudFront Functions vs. Lambda@Edge

• Cache key normalization
  
  • Transform request attributes (headers,
    cookies, query strings, URL) to create an optimal Cache Key
• Header manipulation
  
  • Insert/modify/delete HTTP headers in the request or response
• URL rewrites or redirects
• Request authentication & authorization
  
  • Create and validate user-generated tokens (e.g., JWT) to allow/deny requests

Answer 10

CloudFront Functions

Question 11

CloudFront Functions vs. Lambda@Edge

• Longer execution time (several ms)
• Adjustable CPU or memory
• Your code depends on a 3rd libraries (e.g., AWS SDK to access other AWS services)
• Network access to use external services for processing
• File system access or access to the body of HTTP requests

Answer 11

Lambda@Edge

Question 12

By default, is your Lambda function
launched inside your own VPC?

Answer 12

No

Question 13

Lambda must be configured to launch in the VPC by defining the VPC ID, the Subnets and the Security Groups

Answer 13

True

Question 14

Lambda will create an ENI (Elastic Network Interface) in your subnets to be launched in your VPC

Answer 14

True

Question 15

IImproves Lambda functions directly accessing your DB by by pooling and sharing DB
connections

Answer 15

RDS Proxy

Question 16

If using Lambda with RDS proxy it must be deployed in your VPC

Answer 16

True

Question 17

Allows you to process data events from within a RDS for PostgreSQL and Aurora MySQL DB by allowing outbound traffic, and required permissions

Answer 17

Lambda

Question 18

Notifications that tells information about the DB
instance itself (created, stopped, start, …)

Answer 18

RDS Event Notifications

Question 19

NoSQL fully managed Database-as-a-Service (DBaaS) product available within AWS. It is highly resilient across multiple AZ in a region or globally

Answer 19

DynamoDB

Question 20

The capacity mode used with an unknown, unpredictable load or low admin overhead on a DynamoDB table

Answer 20

On-Demand

Question 21

The capacity mode in DynamoDB where the RCU and WCU are set on a per-table basis

Answer 21

Provisioned mode

Question 22

Most flexible way to get data from a DynamoDB table but the least efficient by moving through the table and consuming the capacity of every item

Answer 22

Scan

Question 23

Reading DynamoDB data which is directed at a random node across the AZs. Possible to return with stale data if a node is checked before replication completes

Answer 23

Eventually Consistent reads

Question 24

Reading DynamoDB data that is directly connected to the leader node which always returns the most up-to-date copy of data

Answer 24

Strongly Consistent reads

Question 25

in-memory cache designed specifically for DynamoDB designed for fast response times for accessing Eventually Consistent Data. There is a primary Node which writes and replica nodes that read spread across AZs

Answer 25

DynamoDB Accelerator (DAX)

Question 26

Provides multi-master global replication of DynamoDB tables which can be used for performance, HA or DR/BC reasons. Tables are replication in multiple regions and added to a single table

Answer 26

DynamoDB Global Tables

Question 27

A continuous stream of backups of a DynamoDB Table over 35 days that needs to be enabled on a per-table basis

Answer 27

Point-In-Time Recovery

Question 28

fully managed service with support for the WebSocket Protocol that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale

Answer 28

Amazon API Gateway