Module2

Question 1

Scalability

Answer 1

Scalability involves beginning with only the resources you need and designing your architecture to automatically respond to changing demand by scaling out or in. As a result, you pay for only the resources you use. You don’t have to worry about a lack of computing capacity to meet your customers’ needs.

Question 2

Amazon EC2 Auto Scaling

Answer 2

Amazon EC2 Auto Scaling enables you to automatically add or remove Amazon EC2 instances in response to changing application demand.

Question 3

What are the two approaches to Amazon EC2 Auto scaling

Answer 3

Within Amazon EC2 Auto Scaling, you can use two approaches: dynamic scaling and predictive scaling

Question 4

Dynamic scaling responds to?

Answer 4

Dynamic scaling responds to changing demand.

Question 5

What is predictive scaling?

Answer 5

Predictive scaling automatically schedules the right number of Amazon EC2 instances
based on predicted demand.

Question 6

Elastic Load Balancing

Answer 6

is the AWS service that automatically distributes incoming application traffic across multiple resources, such as Amazon EC2 instances.

Question 7

Amazon (SNS)

Answer 7

A messaging service used to deliver push notifications to recipients
publish/subscribe service.
SNS topics, a publisher publishes messages to subscribers.

Simple notification service
Subscribers get all messages
Send message to topics
push-based

Question 8

Examples of SNS?

Answer 8

web servers, email addreses, AWS Lambda funcitons

Question 9

What is SQS?

Answer 9

Using Amazon SQS, you can send, store, and receive messages between software components, without losing messages or requiring other services to be available. In Amazon SQS, an application sends messages into a queue. A user or service retrieves a message from the queue, processes it, and then deletes it from the queue.

Simple queue service
Fully managed queue
pull-based

allows you to send, store, receive messages between software components at any volume.

Question 10

What is payload?

Answer 10

Data contained within a message.

Question 11

What problem does SQS solve and how much volume of msg can it receive?

Answer 11

You can send, store, and receive messages between software components at any volume, without losing messages or requiring other services to be available

Eliminates the complixity and overhead associated with managing and operating message-oriented middleware, and empowers developers to focus on differentiating work

Question 12

What’s the drawback of tighly coupled architecture?

Answer 12

If one component fails, the other starts failing too.
the whole system can fail.

Question 13

Loosely coupled architecture?

Answer 13

if one component fails, the others can continue.
the whole system wont fail

Question 14

What does serverless computing mean?

Answer 14

your code runs on servers but you do not need to provision or manage these servers.

Question 15

What are the benefits of serverless computing?

Answer 15

focus on innovating new products and features instead of maintaining servers
the flexibility to scale serverless applications automatically.

Question 16

Example of serverless computing?

Answer 16

AWS Lambda

Question 17

What is AWS Lambda?

Answer 17

is a service that lets you run code without needing to provision or manage servers.

While using AWS Lambda, you pay only for the compute time that you consume. Charges apply only when your code is running. You can also run code for virtually any type of application or backend service, all with zero administration.

Question 18

AWS lambda features?

Answer 18

1. No need server
2. Short execution (code under 15 mins)
3. Run on demand
4. Automated scaling
5. Connect to relational databases
6. Pay per request & compute time
7. Can run containers using Lambda Container Image

Question 19

How can you invoke aws lambda by?

Answer 19

The lambda console
Function URL (https)
The Lambda API
AWS CLI
AWS SDK
AWS toolkits

Question 20

How does AWS lamda work?

Answer 20

1. upload code to Lambda
2. Set code to trigger from an event source
3. Code runs only when triggered
4. Pay only for the compute time you use

Question 21

What are containers?

Answer 21

a standard way to package your application’s code and dependencies into a single object.

Question 22

What is Amazon ECS?

Answer 22

is a highly scalable, high-performance container management system that enables you to run and scale containerized applications on AWS.

Question 23

Amazon ECS supports what?

Answer 23

Docker containers.

Question 24

What is a docker?

Answer 24

is a software platform that enables you to build, test, and deploy applications quickly.

Question 25

Fargate

Answer 25

Serverless, plug and run
No need EC2

Question 26

What factors region in AWS?

Answer 26

1. compliance
2. Proximity (how close you are bc of latency problem)
3. Feature availably
4. Pricing

Question 27

Whats AZ?

Answer 27

Availability zone

Question 28

What is AWS region?

Answer 28

Isolated between each other
ends with a number (e.g. eu-west-1)
Have at least 2 AZ

Question 29

What is Availability zone?

Answer 29

children of regions
include ONE or more data centers with redundant networking, power and connectivity
suffix with a b c (eu-west-1a)
connected with high bandwidth, ultra-low latency connections
help you solve high availability and disaster recovery scenarios

Question 30

CDN

Answer 30

Amazon cloudfront

Question 31

Edge locations

Answer 31

the places where data are cached to reduce latency
used by CloudFront to cache copies

help get content closer to your customers, no matter where they are in the world.

Question 32

What are the benefits of using Edge locations in AWS?

Answer 32

Improves application performance by delivering content closer to your users
Provides caching which reduces the load on your origin servers