An organization has configured a VPC with an Internet Gateway (IGW). pairs of public and private subnets (each with one subnet per Availability Zone), and an Elastic Load Balancer (ELB) configured to use the public subnets. The application s web tier leverages the ELB. Auto Scaling and a mum-AZ RDS database instance The organization would like to eliminate any potential single points ft failure in this design.
What step should you take to achieve this organization’s objective?
A . Nothing, there are no single points of failure in this architecture.
B . Create and attach a second IGW to provide redundant internet connectivity.
C . Create and configure a second Elastic Load Balancer to provide a redundant load balancer.
D . Create a second multi-AZ RDS instance in another Availability Zone and configure replication to provide a redundant database.
Answer: A
Explanation:
You need multiple ELB if you want HA across regions. “AWS Load Balancer CCross Network Many times it happens that after setting up your ELB, you experience significant drops in your performance. The best way to handle this situation is to start with identifying whether your ELB is single AZ or multiple AZ, as single AZ ELB is also considered as one of the Single Points of Failures on AWS Cloud. Once you identify your ELB, it is necessary to make sure ELB loads are kept cross regions.”
Reference: https://www.botmetric.com/blog/eliminating-single-points-of-failures-on-aws-cloud/