In Q&A

1) Explain what AWS is?
AWS stands for Amazon Web Service; it is a collection of remote computing services also known as a cloud computing platform. This new realm of cloud computing is also known as IaaS or Infrastructure as a Service.  

2) Mention what the key components of AWS are?
The key components of AWS are
Route 53:A DNS web service
Simple E-mail Service:It allows sending e-mail using RESTFUL API call or via regular
Identity and Access Management:It provides enhanced security and identity management for your AWS account
Simple Storage Device or (S3):It is a storage device and the most widely used AWS service
Elastic Compute Cloud (EC2): It provides on-demand computing resources for hosting applications. It is handy in case of unpredictable workloads
Elastic Block Store (EBS):It offers persistent storage volumes that attach to EC2 to allow you to persist data past the lifespan of a single Amazon EC2 instance
CloudWatch: To monitor AWS resources, It allows administrators to view and collect key Also, one can set a notification alarm in case of trouble.

3) Explain what S3 is?
S3 stands for Simple Storage Service. You can use S3 interface to store and retrieve any amount of data, at any time and from anywhere on the web. For S3, the payment model is “pay as you go.”  

4) What is AMI?
AMI stands for Amazon Machine Image. It’s a template that provides the information (an operating system, an application server, and applications) required to launch an instance, which is a copy of the AMI running as a virtual server in the cloud. You can launch instances from as many different AMIs as you need.  

5) Mention what the relationship between an instance and AMI is?
From a single AMI, you can launch multiple types of instances. An instance type defines the hardware of the host computer used for your instance. Each instance type provides different computer and memory capabilities. Once you launch an instance, it looks like a traditional host, and we can interact with it as we would with any computer.

6) What does an AMI include?
An AMI includes the following things
A template for the root volume for the instance
Launch permissions decide which AWS accounts can avail the AMI to launch instances .A block device mapping that determines the volumes to attach to the instance when it is launched.

7) How can you send a request to Amazon S3?
Amazon S3 is a REST service, and you can send a request by using the REST API or the AWS SDK wrapper libraries that wrap the underlying Amazon S3 REST API.

8) What are the storage class available in Amazon s3?
Storage classes available with Amazon s3 are:
Amazon S3 standard
Amazon S3 standard-infrequent Access
Amazon S3 Reduced Redundancy Storage
Amazon Glacier

9) How many buckets can you create in AWS by default?
By default, you can create up to 100 buckets in each of your AWS accounts.  

10) Explain can you vertically scale an Amazon instance? How?
Yes, you can vertically scale on Amazon instance. For that
Spin up a new larger instance than the one you are currently running.
Pause that instance and detach the root webs volume from the server and discard.
Then stop your live instance and detach its root volume.
Note the unique device ID and attach that root volume to your new server And start it again.

11) Explain what T2 instances is?
T2 instances are designed to provide moderate baseline performance and the capability to burst to higher performance as required by the workload.  

12) In VPC with private and public subnets, database servers should ideally be launched
into which subnet?
With private and public subnets in VPC, database servers should ideally launch into private subnets.

13) Mention what the security best practices for Amazon EC2 are?
For secure Amazon EC2 best practices, follow the following steps
Use AWS identity and access management to control access to your AWS resources Restrict access by allowing only trusted hosts or networks to access ports on your instance
Review the rules in your security groups regularly
Only open up permissions that you require
Disable password-based login, for example, launched from your AMI

14) Explain how the buffer is used in Amazon web services?
The buffer is used to make the system more robust to manage traffic or load by synchronizing different component. Usually, components receive and process the requests in an unbalanced way. With the help of buffer, the components will be balanced and will work at the same speed to provide faster services.  

15) While connecting to your instance what are the possible connection issues one might
The possible connection errors one might encounter while connecting instances are
Connection timed out
User key not recognized by the server
Host key not found, permission denied
An unprotected private key file
Server refused our key or No supported authentication method available
Error using MindTerm on Safari Browser
Error using Mac OS X RDP Client

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