Update aws.md

aws.md

@@ -7,28 +7,28 @@
   - [ ] What is cloud computing?
 
   - [ ] The 6 advantages of cloud computing
-    - [ ] **Trade capital expense for variable expense** - pay for what you consume instead of investing in something you don'y fully utilize
-    - [ ] **Benefit from massive economies of scale**
-    - [ ] **Stop guess about capacity** - Cloud scales with your needs
-    - [ ] **Increase speed and agility** - You can use the cloud to quickly build platforms using architectures such as serverless for example
-    - [ ] **Stop spending money running and maintaining data centers** - Focus on what you want instead of focusing on managing infrastructure
-    - [ ] **Go global in minutes** - Easily deploy your application in multiple regions around the world which results in better experience (like lower latency) for users of your app
+    - [ ] Trade capital expense for variable expense - pay for what you consume instead of investing in something you don't fully utilize
+    - [ ] Benefit from massive economies of scale
+    - [ ] Stop guess about capacity - Cloud scales with your needs
+    - [ ] Increase speed and agility - You can use the cloud to quickly build platforms using architectures such as serverless for example
+    - [ ] Stop spending money running and maintaining data centers - Focus on what you want instead of focusing on managing infrastructure
+    - [ ] Go global in minutes - Easily deploy your application in multiple regions around the world which results in better experience (like lower latency) for users of your app
 
   - [ ] 3 Types of cloud computing
-    - [ ] **Infrastructure as a service (IAAS)** - You are managning the server. It can virtual or physical. The provider (e.g. Amazon) will have no access to your server. EC2 is an example of IAAS.
-    - [ ] **Platform As a service (PAAS)** - Someone else manages the underlying hardware and OS. You focus on the application side. Heroku and Google app engine are examples of PAAS.
-    - [ ] **Software As A service (SAAS)** - You only worry about the software. As opoosed to PAAS, you don't have to worry about the installation and the setup of the application. You just have to use the software itself.
+    - [ ] Infrastructure as a service (IAAS) - You are managning the server. It can virtual or physical. The provider (e.g. Amazon) will have no access to your server. EC2 is an example of IAAS.
+    - [ ] Platform As a service (PAAS) - Someone else manages the underlying hardware and OS. You focus on the application side. Heroku and Google app engine are examples of PAAS.
+    - [ ] Software As A service (SAAS) - You only worry about the software. As opoosed to PAAS, you don't have to worry about the installation and the setup of the application. You just have to use the software itself.
 
   - [ ] 3 types of cloud computing deployments
-    - [ ] **Public Cloud** - AWS, Azure & GCP
-    - [ ] **Hybrid** - Mixture of public and private.
-    - [ ] **Private Cloud / On Premise** - You manage it in your datacenter. OpenStack for example.
+    - [ ] Public Cloud - AWS, Azure & GCP
+    - [ ] Hybrid - Mixture of public and private.
+    - [ ] Private Cloud / On Premise - You manage it in your datacenter. OpenStack for example.
 
 - [ ] **Global Infrastructure**
-    
-    - [ ] **Availability Zone** is one or more data centres, each with redundant power, networking and connectivity, housed in separate facilities.
-    - [ ] **Region** is a geographical/physical area. Region consists of two or more availability zones
-- [ ] **Edge locations** are endpoints for AWS which are use for caching content.
+
+    - [ ] Availability Zone is one or more data centres, each with redundant power, networking and connectivity, housed in separate facilities.
+    - [ ] Region is a geographical/physical area. Region consists of two or more availability zones
+    - [ ] Edge locations are endpoints for AWS which are use for caching content.
 
 - [ ] **IAM**
 
@@ -44,18 +44,40 @@
 - [ ] **S3**
 
   - [ ] Simple Storage Service
-  - [ ] S3 is a secure, highly scalable object storage
+  - [ ] S3 is a secure, highly scalable object based storage
+  - [ ] S3 features:
+      - [ ] Tiered Storage Available
+      - [ ] Lifecycle Management - manage which storage tier the file you uploaded goes to
+      - [ ] Versioning - managing different versions of your file and restore previous versions
+      - [ ] Encryption
+      - [ ] Security - using ACL (Access Control Lists) and bucket policies
   - [ ] S3 is object-based storage. The data itself is spread across multiple locations.
   - [ ] Files can be from 0 Bytes to 5 TB. There is unlimited storage.
   - [ ] Files are stored in buckets
   - [ ] Bucket name must be globally unique
+      - [ ] For example: https://s3-eu-west-1.amazonaws.com/mybucket
   - [ ] HTTP 200 code is returned when a file is uploaded successfully to S3
   - [ ] Objects consist of:
-      - [ ] **Key** - name of the object
-      - [ ] **Value** - the data itself
-      - [ ] **Version ID** - used for versioning
-      - [ ] **Metadata** - data about the data
+      - [ ] Key - name of the object
+      - [ ] Value - the data itself
+      - [ ] Version ID - used for versioning
+      - [ ] Metadata - data about the data
   - [ ] Data consistency
+      - [ ] New objects - writing a new file, you will be able immediately read it
+      - [ ] Overwrite and deletes - updating a file or deleting it, you may get the older version when reading it as changes to objects can take some time to be applied
+  - [ ] Transfer Acceleration
+      - [ ] when used, users will upload a file to the edge location which will then upload the files from edge locations to the bucket in specific location using optimized network path (Amazon internal network)
+  - [ ] Cross Region Replication
+      - [ ] For example: you have a bucket in Europe and you upload there a file from USA. This file will be replicated to USA region.
+  - [ ] Charges
+      - [ ] You are charged for the following: storage, requests, storage management, data transfer, transfer acceleration and cross region replication
+  - [ ] Storage Classes
+      - [ ] S3 standard - 99.99% availability and 11x9 durability
+      - [ ] S3 IA - Infrequently access but rapid access when needed
+      - [ ] S3 One Zone IA - lower cost option for IA without multiple AZ data resilience
+      - [ ] S3 Intelligent Tiering -  ML based, designed to optimized costs by automatically moving to most cost-effective access tier
+      - [ ] S3 Glacier - secure, durable and low-cost storage for data archiving
+      - [ ] S3 Glacier Deep Archive - most lost cost storage class where a retrieval time of 12 hours is fine