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.๐’œ๐’ฒ๐’ฎ ๐’ž๐‘’๐“‡๐“‰๐’พ๐’ป๐’พ๐‘’๐’น ๐’Ÿ๐‘’๐“‹๐‘’๐“๐‘œ๐“…๐‘’๐“‡ > Section 15: AWS Serverless: API Gateway & Cognito > Flashcards

Section 15: AWS Serverless: API Gateway & Cognito Flashcards

1
Q

What does API Gateway do with proxy resource?

A

Passes the entire request and response between the frontend and the backend

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2
Q

What is the most popular integration with API Gateway?

A

AWS Lambda

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3
Q

What can API Gateway integrate with

A

Endpoints on EC2
Load Balancers
Any AWS service
External and publicly accessible HTTP endpoints

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4
Q

Are changes in an API Gateway API effective directly?

A

No, the API has to be published to a stage

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5
Q

What does API Gateway keeps in order to allow easy roll backs?

A

History of deployments

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6
Q

API Gateway offers configuration parameters at what level?

A

At the API stage level

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7
Q

Do APIs have environment variables?

A

Stages have stage variables (which is similar to environment variables but for a specific stage)

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8
Q

What can stage variables be used for?

A

Lambda function ARN
HTTP endpoints
Parameters in mapping templates

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9
Q

Are stage variables passed to AWS Lambda?

A

If the resource method integration type is a Lambda function, then yes stage variables are passed in the โ€œcontextโ€ object

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10
Q

What are canary deployments?

A

Canary deployments are a pattern for rolling out releases to a subset of users or servers.

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11
Q

What are mapping templates in API Gateway?

A

They are a way to modify requests / responses (Rename parameters, modify body content, add headers, remove information, etc.)

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12
Q

In what language are mapping templates written?

A

Velocity Template Language (VTL)

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13
Q

What is a common way of writing REST API as code?

A

Swagger / Open API

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14
Q

What are the two supported languages when writing Swagger specification?

A

YAML

JSON

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15
Q

What can you do if one of your endpoints is receiving lots of traffic and the response is always the same?

A

Use caching

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16
Q

What is the default TTL in the API Gateway cache?

A

300 seconds (5 minutes)

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17
Q

What is the min TTL in the API Gateway cache?

A

0 seconds

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18
Q

What is the max TTL in the API Gateway cache?

A

3600 seconds (1 hour)

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19
Q

At which level are caches defined?

A

At the stage level

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20
Q

How much data can be in an API Gateway API stage cache at any given time? __ to __

A

0.5 GB to 237 GB

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21
Q

How can clients invalidate the cache manually?

A

By passing the header โ€œCache-Control: max-age=0โ€

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22
Q

At what level is it possible to enable CloudWatch logging?

A

At the stage level

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23
Q

Is it possible to override cache settings at the resource level?

24
Q

API Gateway API metrics are by ___ ?

25
How to get more metrics from your API?
Enabling detailed metrics
26
How to get the full picture tracing of your API + Lamba ?
Enabling X-Ray
27
What must be enabled when you receive calls from another domain?
CORS
28
What headers does the OPTIONS pre-flight request must contain?
Access-Control-Allow-Methods Access-Control-Allow-Headers Access-Control-Allow-Origin
29
What can you set if you want to "sell" your APIs to consumers?
Usage Plans and API Keys
30
What do API keys allow you to do?
Track API usage from a specific consumer
31
What are the three available authorization methods for API Calls?
IAM Permissions Lambda Authorizer Cognito User Pools
32
What is IAM Permissions authorization good for?
For API authorization within your own infrastructure (Users that need to access the API are registered in your AWS account)
33
What does IAM Permissions authorization leverages?
Signature Version 4 signing process (Sig v4) where IAM credentials are in headers
34
What was the former name of "Lambda Authorizer" ?
Custom Authorizers
35
What is Lambda Authorizer authorization method good for?
Managing authorization with the use of 3rd party type of authentication, OAuth, SAML
36
What must the Lambda Authorizer return?
An IAM policy for the user defining the actions that will be allowed in the backend
37
Can you avoid calling the Lambda Authorizer function multiple times for the same user?
Yes, there is an option to cache the result of authentication
38
What is Cognito User Pools authentication good for?
Good for authenticating (validing the identity) of the caller
39
What does Cognito User Pools NOT offer us?
Authorization
40
What do Cognito users do before calling our API?
Authenticate with Cognito to retrieve a token
41
What does API Gateway do when called to a resource method with Cognito enabled?
Connects with Cognito to evaluate the token
42
Where must the developer implement authorization when using Cognito User Pools?
In the backend
43
What are the three services offered by AWS Cognito
Cognito User Pools Cognito Identity Pools Cognito Sync
44
What do Cognito User Pools offer?
Sign in functionality for app users (username/email + password, Google authentication, Facebook authentication, etc.) Integrate with API Gateway
45
What does Cognito Identity Pools (Federated Identities) provide?
Provide AWS credentials to users so they can access AWS resources directly (CLI, etc.)
46
How does Cognito User Pools integrate as in Cognito Identity Pools?
As an identity provider
47
What is Cognito Sync
It is deprecated and replaced by AppSync | Synchronize data from device to Cognito
48
What identity verification methods are offered by AWS Cognito User Pools?
Verify by email, by phone, MFA, etc.
49
What does Cognito sends back on login/signup?
JWT
50
What does JWT stands for?
JSON Web Token
51
Where do Federated Identity get AWS credentials from for the user?
AWS STS
52
What does (did) AWS Cognito Sync provide?
Storing of preferences, configuration, state of app Cross device synchronization Offline capability (Synchronization when back online)
53
Where was data stored in AWS Cognito Sync
In datasets
54
How many datasets could you have?
Up to 20
55
What was the maximum size of a dataset in AWS Cognito Sync?
1 MB

.๐’œ๐’ฒ๐’ฎ ๐’ž๐‘’๐“‡๐“‰๐’พ๐’ป๐’พ๐‘’๐’น ๐’Ÿ๐‘’๐“‹๐‘’๐“๐‘œ๐“…๐‘’๐“‡ (26 decks)

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