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Add AWS questions

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Mainly about EFS.
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exercises/aws/README.md
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### AWS Exercises
Note: Provided solutions are using the AWS console. It's recommended you'll use IaC technologies to solve the exercises (e.g. Terraform).
#### AWS - IAM
|Name|Topic|Objective & Instructions|Solution|Comments|
@ -455,6 +457,54 @@ It is mostly used for cache and temporary data purposes.
Yes, the data on instance store is lost when they are stopped.
</b></details>
##### AWS Storage - EFS
<details>
<summary>What is Amazon EFS?</summary><br><b>
[AWS Docs](https://aws.amazon.com/efs): "Amazon Elastic File System (Amazon EFS) provides a simple, scalable, fully managed elastic NFS file system for use with AWS Cloud services and on-premises resources."
In simpler words, it's a network file system you can mount on one or more EC2 instances.
</b></details>
<details>
<summary>True or False? EFS is locked into a single availability zone</summary><br><b>
False. EFS can be mounted across multiple availability zones.
</b></details>
<details>
<summary>What are some use cases for using EFS?</summary><br><b>
* Data sharing (e.g. developers working on the same source control)
* Web serving
* Content management
</b></details>
<details>
<summary>True or False? EFS only compatible with Linux based AMI</summary><br><b>
True
</b></details>
<details>
<summary>True or False? EFS requires the user to perform capacity planning as it doesn't scales automatically</summary><br><b>
False. EFS scales automatically and you pay-per-use.
</b></details>
<details>
<summary>Which EFS mode would you use if need maximum throughput?</summary><br><b>
Performance Mode (Max I/O): This provides high throughput and it's used for big data, media processing, etc.
</b></details>
<details>
<summary>What is the default EFS mode?</summary><br><b>
Performance Mode (General Purpose): Used for web servers, CMS, etc.
</b></details>
##### AWS EC2 - Pricing Models
<details>
@ -938,14 +988,6 @@ Learn more [here](https://docs.aws.amazon.com/AmazonS3/latest/dev/transfer-accel
<summary>What storage options are there for EC2 Instances?</summary><br><b>
</b></details>
<details>
<summary>What is Amazon EFS?</summary><br><b>
Amazon definition: "Amazon Elastic File System (Amazon EFS) provides a simple, scalable, fully managed elastic NFS file system for use with AWS Cloud services and on-premises resources."
Learn more [here](https://aws.amazon.com/efs)
</b></details>
<details>
<summary>What is AWS Snowmobile?</summary><br><b>