AWS Technical Essentials

Question 1

Definitions

What is cloud computing?

Answer 1

On-demand delivery of IT resources via internet

Question 2

IAM

Relations between users, groups and policies

Answer 2

Groups groups policies. Users can be assigned to groups.

Question 3

What are the four main factors you should take into consideration when choosing a Region?

Answer 3

Latency, price, service availability and compliance

Question 4

AWS Infrastructure

Relationship between Regions, Availability Zones, and data centers?

Answer 4

Regions are clusters of Availability Zones. Availability Zones are clusters of data centers.

Question 5

What is a best practice when securing an AWS root user?

Answer 5

Enable multi-factor authentication
Disable or delete the access keys associated with the root user

Question 6

Compute Services

What compute services are there on AWS?

Answer 6

Fundamental level: virtual machines (VM), container services, and serverless.

Question 7

AWS EC2

List ec2 instance families

Answer 7

General purpose, compute optimized, memory optimized, accelerated computing, storage optimized (high I/O)

Question 8

VPC

What is the default Virtual Private CLoud?

Answer 8

The default Virtual Private Cloud is a vpc created by AWS by default for each aws user. It is PUBLIC and ACCESSIBLE by the internet.

Question 9

Lifecycle of an EC2 instance

Answer 9

Pending, running, shutting down, rebooting, terminated, stopping, stopped.
Termianting an instance: Running -> Shutting down -> terminated
Stopping and restarting an instance: Running -> stopping -> stopped -> pending -> running
Launching: pending -> running

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Question 10

AWS EC2

What is the difference between stopping and stop-hibernating?

Answer 10

Stop-hibernating saves the content of the instance memory (RAM) to the Amazon EBS root volume. Stopping loses the instance memory.

Question 11

AWS EC2

List pricing options for EC2

Answer 11

On-Demand; Reserved Instances; Spot Instances

Question 12

AWS EC2

Characteristics of On-Demand pricing

Answer 12

No long-term commitments, the price per second is fixed.

Question 13

AWS EC2

Characteristics of Reserved Instances

Answer 13

Significant discount compared to OD pricing.
A discounted hourly rate and an optional capacity reservation for ec2 instances.

Three payment options:
* all upfront
* partial upfront
* no upfront

For each of these options you can select either a 1-year term or 3-year term.

RI instances are associated with an isntance type and an Availability Zone, it is not associated with the specific instance id.

Question 14

AWS EC2

Characteristics of Spot Instances

Answer 14

Take advantage of unused ec2 capacity in the aws cloud.

Available at up to a 90% discount compared to OD pricing.

How does it work?
* set a limit on how much you would like to pay for the instance hour
* this is compared against the current ec2 price

Spot Instances might be interrupted. AWS gives a 2 minute warning before it interrupts the instance.

Question 15

What is a container?

Answer 15

A container is a standardized unit that packages code and its dependencies.

Question 16

ECS

What is elastic container service (ECS)?

Answer 16

ECS is an end-to-end container orchestration service to spin up new container sand manage them across a cluster of ec2 instances.

Question 17

What is elastic kubernetes service?

Answer 17

Kubernetes is a portable, extensible, open source platform for managing containerized workloads and services.

Question 18

Serverless

Two types of serverless services on aws

Answer 18

AWS Lambda, AWS Fargate