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Regions and Availability Zones

AWS has many regions to choose from. Each region is where your services are geographically located.

An outage in one region will (usually) not affect another region.
The farther a server is from the user, the higher the latency. Choose a region close to the folks using your service.
Some services are available only in certain places, or are significantly more expensive in some regions. So we need to make sure a region meets our needs.
As a service grows, we may want to host in more than one region. We also pay a toll for transferring data between regions.

Availability Zones (AZs)

Each region is split into "zones," which means separate infrastructure within the same region.

An outage in one zone will (usually) not affect servers hosted in another zone.
We pay a toll for transferring data between zones.

Set your default AWS region to us-east-1.

Cost check: Listing regions and availability zones is free, and changing your default region is also free.

List all available AWS regions using the AWS CLI:
```
aws ec2 describe-regions --output table
```
Press "q" to quit when you're done looking at the output.

List availability zones for your current region:

aws ec2 describe-availability-zones --output table

Switch your default region to us-east-1 (if it isn't already):
```
aws configure set region us-east-1
```
In the AWS web console, open the region dropdown and select "N. Virginia" (us-east-1) to match your CLI region.
Verify your region is set correctly:
```
aws configure get region
```
You should now see us-east-1 as the output.

Run and submit the CLI tests.