Virtual Private Cloud Quiz
An application consists of the following architecture:
a. EC2 Instances in multiple AZ’s behind an ELB
b. The EC2 Instances are launched via an Auto Scaling Group.
c. There is a NAT instance which is used so that instances can download updates from the Internet.
Which of the following is a bottleneck in the architecture?
A. The EC2 Instances
B. The ELB
C. The NAT Instance
D. The Auto Scaling Group
C. The NAT Instance
Since there is only one NAT instance, this is a bottleneck for the architecture. For high availability, launch NAT instances in multiple Available Zones and make it as part of an Auto Scaling Group.
For more information on NAT Instances, please visit the following URL:
https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html
