What is server immutability?

You are building a game high score table in DynamoDB. You will store each user’s highest score for each game, with
many games, all of which have relatively similar usage levels and numbers of players. You need to be able to look up the
highest score for any game. What’s the best DynamoDB key structure?

You need to perform ad-hoc business analytics queries on well-structured data. Data comes in constantly at a high
velocity. Your business intelligence team can understand SQL. What AWS service(s) should you look to first?

Your application consists of 10% writes and 90% reads. You currently service all requests through a Route53 Alias
Record directed towards an AWS ELB, which sits in front of an EC2 Auto Scaling Group. Your system is getting very
expensive when there are large traffic spikes during certain news events, during which many more people request to
read similar data all at the same time. What is the simplest and cheapest way to reduce costs and scale with spikes like
this?

What method should I use to author automation if I want to wait for a CloudFormation stack to finish completing in a script?

You have a high security requirement for your AWS accounts. What is the most rapid and sophisticated setup you can
use to react to AWS API calls to your account?

If you’re trying to configure an AWS Elastic Beanstalk worker tier for easy debugging if there are problems finishing queue
jobs, what should you configure?

Your CTO is very worried about the security of your AWS account. How best can you prevent hackers from completely
hijacking your account?

You need the absolute highest possible network performance for a cluster computing application. You already selected
homogeneous instance types supporting 10 gigabit enhanced networking, made sure that your workload was network
bound, and put the instances in a placement group. What is the last optimization you can make?

Your application’s Auto Scaling Group scales up too quickly, too much, and stays scaled when traffic decreases. What
should you do to fix this?