Important changes by AWS to Auto Scaling Policies

Today AWS announced the introduction of new auto scaling policies with steps. This is a significant change as no longer does auto scaling need to be a single step response to a CloudWatch alarm. You can now have many steps enabling small changes in capacity to be made in response to small changes in demand and likewise for large changes. The result is highly reactive and smooth response to demand.
We have updated our documentation "Lab Notes - Highly Available and Fault Tolerant Architecture for Web Applications inside a VPC" to v1.02 to reflect this change. Please make sure you understand this before sitting the AWS certification exam.

New Highly Available and Fault Tolerant VPC Architecture Tutorial

New Highly Available and Fault Tolerant VPC Architecture Tutorial Utilising ELB, ENI, Auto Scaling and the new S3 Endpoints and Multi-AZ Aurora Clusters We have just added a new tutorial to the AWS Certified Solutions Architect Associate Course that applies what you have learned in the lessons and quizzes.
These videos cover the essential hands knowledge in AWS architecture required for certification. Look for them in the AWS Architecture Design Patterns subject.

Multiple Subnets per Availability Zone with Auto Scaling groups

You can now select more than one subnet per availability zone in an Autoscaling group.
You no longer need to remove an existing subnet from an Autoscaling group in order to reconfigure the subnets. You can simply add more subnets without affecting your applications availability.

More details in the docs at:
AutoScaling Developer Guide