AWS Scaling and Resilience

Question 1

What is resiliency?

Answer 1

It is the ability to keep working and providing a service in the vent of a failure. Scaling and Resilience are the second pillars of the well-architected framework.

Question 2

If an IAM region fails, can you still interact with AWS IAM?

Answer 2

IAM is a global service, you may not be able to interact with resources in the failed region but you will be able to interact with services in other regions.

Question 3

What is an AZ?

Answer 3

It is a single fault domain, AWS does not say it is a DC, but when we look at regions like Ireland there are three AZz and they are showing as in cork, Galway and Dublin.

Question 4

Is a snapshot replicated across AZs?

Answer 4

A snapshot is stored to S2 and as such has three replicas stored across three or more AZs

Question 5

Is s3 a regional or global service?

Answer 5

It is a global service but the data is stored only in a single region.

Question 6

Where does Route53 operate from in AWS?

Answer 6

The edge locations.

Question 7

Where do ELBs operate from, regions, AZ’s, global?

Answer 7

A single region.

Question 8

Are VPC’s a region or global services?

Answer 8

A region

Question 9

Is a NAT GW an AZ, Region or Global services?

Answer 9

It is deployed in a single AZ’s

Question 10

Is auto scaling groups a region, az or global services>

Answer 10

autoscaling group are across az’s