Which of the below mentioned statements will help George and Ray understand the availability zone (AZ) concept better?

George has launched three EC2 instances inside the US-East-1a zone with his AWS account. Ray has

launched two EC2 instances in the US-East-1a zone with his AWS account.

Which of the below mentioned statements will help George and Ray understand the availability zone (AZ) concept better?
A .  All the instances of George and Ray can communicate over a private IP with a minimal cost
B .  The US-East-1a region of George and Ray can be different availability zones
C .  All the instances of George and Ray can communicate over a private IP without any cost
D .  The instances of George and Ray will be running in the same data centre

View Answer

Answer: B

Explanation:

Each AWS region has multiple, isolated locations known as Availability Zones. To ensure that the AWS resources are distributed across the Availability Zones for a region, AWS independently maps the Availability Zones to identifiers for each account. In this case the Availability Zone US-East-1a where George’s EC2 instances are running might not be the same location as the US-East-1a zone of Ray’s EC2 instances. There is no way for the user to coordinate the Availability Zones between accounts.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html