Amazon Services

Question 1

multitenancy

Answer 1

sharing physical machines with multiple other users

Question 2

hypervisor

Answer 2

used to manage and coordinage isolation of multitenant VMs

Question 3

CaaS

Answer 3

Compute as a Service

Question 4

scaling

Answer 4

vertical scaling - instances are resizable

Question 5

EC2

Answer 5

Elastic Compute Cloud

Question 6

types of EC2 instances

Answer 6

• general purpoe
• compute optimized
• storage optimized
• memory optimized
• accelerated computing

Question 7

compute optimized instances - uses

Answer 7

• gaming
• hpc
• scientific modeling

Question 8

memory optimized instances - uses

Answer 8

• high performance DBs
• real time data processing

Question 9

accelerated computing - uses

Answer 9

• FP calculations
• graphics
• data pattern matching

Question 10

storage optimized instances - uses

Answer 10

• distributed file systems
• data warehousing
• OLTP (online transactional processing)

Question 11

storage optimized instances - what is the optimization?

Answer 11

high IOPS - tens of thousands

Question 12

accelerated computing instances - what is the optimization?

Answer 12

use of hardware accelerators (coprocessors)

Question 13

EC2 instance pricing types

Answer 13

• on demand (per hour, per second)
• savings plan
• reserved instances
• spot instances
• dedicated host

Question 14

What is savings plan?

Answer 14

Reduced pricing in exchange for committment to use.

Question 15

How long are savings plan agreements for?

Answer 15

1 or 3 years

Question 16

How cheaper can the savings plan be?

Answer 16

Up to 60%.

Question 17

What are reserved instances used for?

Answer 17

Steady-state workloads or workloads with predictable usage.

Question 18

How long are reserved instances agreements for?

Answer 18

1 or 3 years.

Question 19

How cheaper the reserved instances can be?

Answer 19

Up to 72%.

Question 20

What is the deal with spot instances?

Answer 20

AWS can claim an instance back at any time with 2-minute warning.

Question 21

What are spot instances good for?

Answer 21

Workflows which are not affected by sudden disruptions.

Question 22

How cheaper are spot instances?

Answer 22

Up to 90%.

Question 23

Why someone would choose a dedicated host?

Answer 23

For meeting compliance requirements.

Question 24

What is a dedicated host?

Answer 24

A physical host, no shared tenancy.

Question 25

Amazon EC2 Auto Scaling

Answer 25

EC2 service which allows for automatically scaling in response to changing demand.

Question 26

2x2 types of scaling

Answer 26

- dynamic scaling vs. predictive scaling - scaling up vs. scaling out

Question 27

What is dynamic scaling?

Answer 27

Scaling responds to the actual demand.

Question 28

What is predictive scaling?

Answer 28

Scheduling the right amount of instances based on predicted demand.

Question 29

What is scaling up?

Answer 29

Adding more power to an instance.

Question 30

What is scaling out?

Answer 30

Adding more instances.

Question 31

What can be configured in an Auto Scaling Group?

Answer 31

Minimum capacity, desired capacity, maximum capacity.

Question 32

Elastic Load Balancing (ELB)

Answer 32

A managed service. A load balancer which routes requests to instances to properly distribute traffic in: - high performant - cost efficient - highly available - automatically scalable way.

Question 33

Features of the ELB

Answer 33

- regional construct (single URL) - automatically highly available - automatically scalable (handles additional traffic without additional cost) - not only for external traffic - single point of contact to an autoscaling group

Question 34

Amazon SNS (Simple Notification Service) - features

Answer 34

- send messages to services - send notifications to end users - publish/subscribe model (topic + publisher + subscribers)

Question 35

SNS subscribers include...

Answer 35

- push - sms - email

Question 36

SNS publishers include...

Answer 36

- SQS - http(s) - lambda

Question 37

Amazon SQS (Simple Queue Service) is used for...

Answer 37

sending, storing, receiving messages between software components (at any volume)

Question 38

Amazon SQS - features

Answer 38

- scales automatically - reliable - protects payload

Question 39

Why would you want to use messaging and queuing

Answer 39

to avoid tight coupling of components -> to achieve loosely coupled architecture

Question 40

What is the name of the architecture that makes use of messaging and queuing?

Answer 40

Microservice architecture

Question 41

What is serverless compute?

Answer 41

User cannot access the underlying infrasctructure.

Question 42

What are the steps to use Amazon Lambda?

Answer 42

- upload code to a lambda function - configure a trigger - lambda waits for the trigger - when the trigger happens, the code is run in a managed environment

Question 43

What is the runtime limit for Amazon Lambda?

Answer 43

15 minutes

Question 44

What do you pay for using Amazon Lambda?

Answer 44

For the time the code is running.

Question 45

Amazon ECS

Answer 45

Elastic Container Service - docker container orchestration tools run on an instance managed by the user

Question 46

Amazon EKS

Answer 46

Elastic Kubernetes Service

Question 47

Amazon Fargate

Answer 47

serverless platform for ECS and EKS