Q1. Which of these techniques enables the fastest possible rollback times in the event of a failed deployment?A. Rolling; ImmutableB. Rolling; MutableC. Canary or A/BD. Blue-Green View AnswerAnswer: DExplanation:AWS specifically recommends Blue-Green for super-fast, zero-downtime deploys - and thus rollbacks, which are redeploying old code.You use various strategies to migrate the traffic from your current application stack (blue) to a new…
Q1. Which of these is not a reason a Mu|ti-AZ RDS instance will failover?A. An Availability Zone outageB. A manual failover of the DB instance was initiated using Reboot with failoverC. To autoscale to a higher instance classD. The primary DB instance fails View AnswerAnswer: CExplanation:The primary DB instance switches over automatically to the standby replica if any of the >…
Q1. Your CTO thinks your AWS account was hacked. What is the only way to know for certain if there was unauthorized access and what they did, assuming your hackers are very sophisticated AWS engineers and doing everything they can to cover their tracks?A. Use CloudTrai| Log File Integrity Validation.B. Use AWS Config SNS Subscriptions and process events in real…
Q1. Your API requires the ability to stay online during AWS regional failures. Your API does not store any state, it only aggregates data from other sources - you do not have a database. What is a simple but effective way to achieve this uptime goal?A. Use a CloudFront distribution to serve up your API. Even if the region your…
Q1. When thinking of AWS Elastic Beanstalk, the 'Swap Environment URLs' feature most directly aids in what?A. Immutable Rolling DeploymentsB. MutabIe Rolling DeploymentsC. Canary DeploymentsD. Blue-Green Deployments View AnswerAnswer: DExplanation:Simply upload the new version of your application and let your deployment service (AWS Elastic Beanstalk, AWS CIoudFormation, or AWS OpsWorks) deploy a new version (green). To cut over to the new…
Q1. You are experiencing performance issues writing to a DynamoDB table. Your system tracks high scores for video games on a marketplace. Your most popular game experiences all of the performance issues. What is the most likely problem?A. DynamoDB's vector clock is out of sync, because of the rapid growth in request for the most popular game.B. You selected the…
Q1. If I want CIoudFormation stack status updates to show up in a continuous delivery system in as close to real time as possible, how should I achieve this?A. Use a long-poll on the Resources object in your CIoudFormation stack and display those state changesin the UI for the system.B. Use a long-poll on the ListStacksAPI call for your CIoudFormation…
Q1. What does it mean if you have zero IOPS and a non-empty I/O queue for all EBS volumes attached to a running EC2 instance?A. The I/O queue is buffer flushing.B. Your EBS disk head(s) is/are seeking magnetic stripes.C. The EBS volume is unavailable.D. You need to re-mount the EBS volume in the OS. View AnswerAnswer: CExplanation:This is the definition of…
