Serverless Computing

Question 1

Enables you to build scalable applications quickly, without managing any server

Answer 1

Serverless

Question 1

Serverless Application are event driven, and you are charged only when your code is executed. True or False

Answer 1

True

Question 2

It is a Lambda resource or a resource in another service that you configure to invoke your function in response to lifecycle events, external requests, or on a schedule.

Answer 2

Lambda Triggers

Question 3

Lambda pay only when?

Answer 3

Your code executes

Question 3

Examples of serverless technology?

Answer 3

Lambda, API Gateway, DynamoDB, S3, SNS, SQS.

Question 4

Lambda is continuous scaling means?

Answer 4

Lambda scales automatically.

Question 5

Lambda functions are ___________. Each event will trigger a single function.

Answer 5

Independent

Question 6

Lambda functions are event driven means?

Answer 6

Lambda functions are triggered by an event or action.

Question 7

What are the AWS Services that can invoke lambda functions?

Answer 7

DynamoDB, Kinesis, SQS, Application Load Balancer, API Gateway, Alexa, CloudFront, S3, SNS, SES, CloudFormation, CloudWatch, CodeCommit, CodePipeline

Question 8

It provides an endpoint to your applications running in
AWS.

Answer 8

Amazon API Gateway

Question 9

You can ___________ API Gateway to prevent your application from being
overloaded by too many requests.

Answer 9

Throttle

Question 10

Everything is logged to ___________, For example, API calls,
latencies, and errors as well. And if you remember,

Answer 10

CloudWatch

Question 10

CORS is enforced by the?

Answer 10

Client

Question 11

If you are using Javascript/AJAX that uses multiple domains with
API Gateway, ensure that you have enabled ___________ on API
Gateway

Answer 11

CORS

Question 12

You can have multiple versions of lambda functions? True or False

Answer 12

True

Question 13

It is always the latest version of code you uploaded to Lambda.

Answer 13

$LATEST

Question 14

Can split traffic using ________ to different versions of lambda functions

Answer 14

Aliases

Question 15

Versions are immutable (Cannot be changed)? True or False

Answer 15

True

Question 16

Cannot split traffic with $latest, instead create an alias to latest? True or False

Answer 16

True

Question 17

What is throttling default Limit?

Answer 17

10,000 rps and 5,000 Concurrent Requests

Question 18

If you do hit the Lambda concurrent execution limit, you will start to see __________
which means there are too many requests coming in and you have hit the concurrent executions limit.

Answer 18

429 HTTP status code

Question 19

If you do hit the Lambda concurrent execution limit, the remedy is?

Answer 19

Get the limit raised by AWS support.

Question 20

if you’re running a critical application, then you can use __________ to guarantee a set number of Lambda concurrent executions are always available for your critical function.

Answer 20

Reserved concurrency

Question 21

You can enable Lambda to access resources in a?

Answer 21

Private VPC.

Question 22

It provide VPC Config information to the function.

Answer 22

Private subnet ID and security group ID.

Question 23

Lambda configures an ENI, using an IP from the private subnet CIDR range.

Answer 23

Lambda Uses the VPC Information

Question 24

It allows your function to access resources in VPC.

Answer 24

Security Group

Question 25

Great way to visualize and orchestrate your serverless applications.

Answer 25

Step Functions Visualize and Orchestrate

Question 26

It automatically triggers and tracks each step of the state machine or workflow. The output of one step is often the input to the next.

Answer 26

Step Functions

Question 27

It logs the state of each step, so if something goes wrong, you can track what went wrong and where.

Answer 27

Step Functions Logging

Question 28

Step Functions Workflow that is long running(up to 1 year). At-most-once. Non-idempotent.

Answer 28

Step Functions Standard Workflows

Question 29

Step Functions Workflow that is the workflow must be complete before next step begins.

Answer 29

Step Functions Synchronous Express Workflows

Question 30

Step Functions Workflow that is short lived (up to 5 mins). At-least-once. Idempotent.

Answer 30

Step Functions Express Workflows

Question 31

Step Functions Workflow that is other task are not dependent on the completion of the workflow.

Answer 31

Step Functions Asynchronous Express Workflows

Question 32

It helps developers analyze and debug distributed applications.

Answer 32

X-RAY

Question 33

It is a visual representation of your application.

Answer 33

X-RAY Service Map

Question 34

It must be installed on your EC2 instance. It is use to instrument your application to send traces to X-Ray.

Answer 34

X-Ray agent/daemon and X-Ray SDK

Question 35

it provides an end-to-end view of requests as they travel through your application.

Answer 35

X-RAY Service Map

Question 36

X-Ray integrates with many AWS services like?

Answer 36

DynamoDB, Lambda, API Gateway, etc.

Question 37

You can also instrument your own applications to send data to X-Ray like?

Answer 37

data about incoming HTTP requests to your application

Question 38

X-Ray Supported Platforms

Answer 38

EC2, Elastic Beanstalk environments, on-premises systems, and ECS.

Question 39

How to Running X-Ray in ECS?

Answer 39

Run the X-Ray daemon in its own Docker image, running alongside your application.

Question 40

How to X-Ray Annotations works?

Answer 40

Add user-defined key-value pairs to your X-Ray data, allowing you to filter, index, and search (e.g., game_name=TicTacToe, game_id=2645).

Question 41

Improve the performance of your APIs by to _________________ avoid calling your backend every time.

Answer 41

Caching the output of API calls

Question 42

How API GATEWAY Caching reduces the number of API calls?

Answer 42

API Gateway returns the cached response instead of making a new request to your application.

Question 43

API Gateway responses are cached for a. The default TTL is 300 seconds (5 minutes).

Answer 43

TTL period

Question 44

What is the default TTL?

Answer 44

The default TTL is 300 seconds (5 minutes).

Question 45

You can import APIs using external definition files like?

Answer 45

OpenAPI, formerly known as Swagger?

Question 46

How to deal with legacy applications that use SOAP.

Answer 46

You can configure API Gateway as a SOAP web service passthrough, or you can use API Gateway to convert the XML response to JSON.