Cloud Practitioner - 2. Global Infrastructure & Reliability

Question 1

What is an AWS Region (in general)?

Answer 1

Physical geographic locations where AWS builds data center clusters.

Question 2

How many Availability Zones does a Region contain?

Answer 2

Three or more

Question 3

How far apart are the Availability Zones in a Region?

Answer 3

100 km or less

Question 4

How many Regions are there?

As of January, 2024

Answer 4

33

https://aws.amazon.com/about-aws/global-infrastructure/

Question 5

Four criteria for region selection?

Answer 5

• Compliance - E.g., Data Sovereignty
• Features - Some features not available in all Regions
• Pricing - Some Regions are more expensive for some services
• Proximity - To user base or data source

Question 6

What is an Availability Zone (in general)?

Answer 6

• A logical data center

Question 7

How many physical data centers makes up an AZ?

Answer 7

**One or more **physical data centers

Question 8

Do different AZs share any hardware?

Answer 8

AZs share no hardware or other components.

Question 9

How many Availability Zones are there?

As of January, 2024

Answer 9

105

https://aws.amazon.com/about-aws/global-infrastructure

Question 10

The six core AWS service categories?

Answer 10

• Compute
• Storage
• Database
• Network and Content delivery
• Security, Identity, and Compliance
• Management and Governance

Question 11

How many of the 239 AWS services are available in all regions?

Answer 11

65

https://awsservices.info

Question 12

What are the 3 failure domains of AWS services?

Answer 12

• Zonal
• Regional
• Global

Question 13

A Zonal AWS service cannot tolerate the failure of (____)?

Answer 13

The Availability Zone where the service instance is deployed.

https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/zonal-services.html

Question 14

Is a Zonal service instance affected by the failure of a different AZ?

Answer 14

No!

https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/zonal-services.html

Question 15

A Regional AWS service cannot tolerate the failure of (____)?

Answer 15

The Region where the service instance is deployed

https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/regional-services.html

Question 16

Is a Regional service instance affected by the failure of a different Region?

Answer 16

No!

https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/regional-services.html

Question 17

What’s the failure domain type of most AWS services?

Answer 17

Zonal

Question 18

How to protect a Zonal service instance from failure of one Availability Zone?

Answer 18

Deploy the service instance in multiple Availability Zones.

https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/zonal-services.html

Question 19

How are Regional services protected from the failure of an AZ?

Answer 19

• AWS runs them in multiple Availability Zones
• AWS presents a single Regional endpoint to customers

https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/regional-services.html

Question 20

Name three Zonal services.

Answer 20

• EC2 instances
• EBS volumes
• Elastic IP addresses
• NAT gateways
• Client VPN endpoints

Question 21

Name three Regional Services.

Answer 21

• S3
• DynamoDB
• SQS
• ELB
• Amazon RDS
• Amazon ElastiCache