AWS Questions

Question 1

What is AWS Lambda

Answer 1

AWS service which allows code to be executed without the use of servers, automatically executes code after a certain event has been triggered while managing compute resource

Question 2

What is the use of Lambda

Answer 2

To automatically execute a service once an event has been triggered in AWS

Question 3

What are the purpose of Lambda execution roles

Answer 3

Roles are used to allow a Lambda function access to a particular AWS service

Question 4

Differences between using Lambda’s for Python and Java

Answer 4

Python: Lambda function can be written in browser
Java: Lambda code must be uploaded in .jar file

Question 5

What is AWS Cloud9

Answer 5

Cloud9 is an integrated development environment that allows code to be written, debugged, and ran all within a web browser

Question 6

Provide two real time examples of using AWS Lambda

Answer 6

1. Invoking Lambda functions with AWS SNS notifications

2. Using a Lambda function to process messages in AWS SQS

Question 7

What is Auto Scaling

Answer 7

Auto scaling allows for the automatic scaling of server capacity so that the applications are able to run smoothly

Question 8

What is an AWS EC2

Answer 8

Elastic Compute Cloud; allows for a scalable and resizable cloud compute service

Question 9

What are key pairs in the context of EC2

Answer 9

Key pairs are the security credentials used to access EC2 instances. Private keys are held by the user while public is stored in the EC2 instance

Question 10

What is Elastic Load Balancing

Answer 10

Elastic load balancing in AWS allows for incoming traffic to be dynamically adjusted so that each EC2 instance is able to receive and equal distribution

Question 11

What are EBS volumes?

Answer 11

Elastic block store volumes; provide block level storage for EC2 servers, with volume associated with instances able to be dynamically changed

Question 12

What is AWS s3

Answer 12

Simple Storage Service; scalable storage service provided by AWS created to store large amounts of data and retrieve them from anywhere

Question 13

Main differences between EBS and s3

Answer 13

1. EBS is directly attached to EC2 instance, s3 is not
2. EBS is associated with quickly retrieving data
3. s3 is associated with storing larger amounts of data for an extended amount of time

Question 14

What are AWS policies

Answer 14

Policies define the permissions given to users, regarding access to specific AWS entities

Question 15

What different kind of policies are there

Answer 15

1. Identity based - grant permissions to an identity (Ex: IAM)
2. Resource based - grant permissions to a resource (Ex: S3 Bucket)

Question 16

What is AWS IAM

Answer 16

Identity Access Management; allows you to control access to AWS services and resources on your account

Question 17

Explain the two types of access provided when creating users

Answer 17

Console access - allows actions to be invoked through written code or through a third party tool
Programming access - allows actions to be invoked through the AWS console

Question 18

Explain the difference between AWS users and roles

Answer 18

Users are given the ability to sign in to AWS console and are used to identify a specific user of AWS, while roles do not uniquely define a person with access credentials, but are used to connect AWS services together

Question 19

What is the purpose of an IAM policy

Answer 19

Policies are used to define the roles of users and groups

Question 20

What is a VPC?

Answer 20

Virtual Private Cloud; virtual network dedicated to your AWS, logically isolated in order to ensure security from outside breaches

Question 21

What is a subnet?

Answer 21

individual section within a VPC use to help categorize AWS instances as public/private, shares common address with VPC (same prefix in IP address)

Question 22

What is an internet gateway?

Answer 22

gateway attached to VPC responsible for directing traffic to and from the internet

Question 23

What is a routing table?

Answer 23

Set a rules used to determine where network traffic will be directed within a VPC, according to availability of subnets

Question 24

What is a security group?

Answer 24

Security groups act as a virtual firewall for instances in AWS EC2 instances for both inbound and outbound traffic

Question 25

What is AWS EFS?

Answer 25

Elastic File System; file based storage system that is able to be attached to EC2 instance

Question 26

What is a NAT gateway?

Answer 26

Network Address Translation service; allows for private subnets to connect to service external to VPC while blocking unsolicited traffic

Question 27

What is AWS SQS

Answer 27

Amazon Simple Queue Service; fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications

Question 27

What is AWS SQS

Answer 27

Amazon Simple Queue Service; fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications

Question 28

What is AWS RDS

Answer 28

Relations Database Service; enables users to launch relational database on AWS

Question 29

What is DynamoDB and what advantage does it have over RBS?

Answer 29

DynamoDB is a database for key-value database for unstructured data (NoSQL). DynamoDB is advantaged in the fact that it offers incredible speed and that it encrypts data by default