Your system recently experienced down time. During the troubleshooting process you found that
a new administrator mistakenly terminated several production EC2 instances.
Which of the following strategies will help prevent a similar situation in the future?
The administrator still must be able to:
– launch, start, stop, and terminate development resources,
– launch and start production instances.

Refer to the architecture diagram above of a batch processing solution using Simple Queue
Service (SQS) to set up a message queue between EC2 instances which are used as batch
processors. CloudWatch monitors the number of job requests (queued messages) and an Auto
Scaling group adds or deletes batch servers automatically based on parameters set in
CloudWatch alarms.
You can use this architecture to implement which of the following features in a cost effective and
efficient manner?

An ERP application is deployed across multiple AZs in a single region. In the event of failure, the
Recovery Time Objective (RTO) must be less than 3 hours, and the Recovery Point Objective
(RPO) must be 15 minutes. The customer realizes that data corruption occurred roughly 1.5
hours ago. What DR strategy could be used to achieve this RTO and RPO in the event of this
kind of failure?

Your application is using an ELB in front of an Auto Scaling group of web/application servers
deployed across two AZs and a Multi-AZ RDS Instance for data persistence. The database CPU
is often above 80% usage and 90% of I/O operations on the database are reads. To improve
performance you recently added a single-node Memcached ElastiCache Cluster to cache
frequent DB query results. In the next weeks the overall workload is expected to grow by 30%.
Do you need to change anything in the architecture to maintain the high availability of the
application with the anticipated additional load? Why?

Your company runs a customer facing event registration site. This site is built with a 3-tier
architecture with web and application tier servers and a MySQL database. The application
requires 6 web tier servers and 6 application tier servers for normal operation, but can run on a
minimum of 65% server capacity and a single MySQL database.
When deploying this application in a region with three availability zones (AZs), which architecture
provides high availability?

Your startup wants to implement an order fulfillment process for selling a personalized gadget
that needs an average of 3-4 days to produce with some orders taking up to 6 months.
You expect 10 orders per day on your first day, 1000 orders per day after 6 months and 10,000
orders after 12 months. Orders coming in are checked for consistency, then dispatched to your
manufacturing plant for production, quality control, packaging, shipment and payment processing.
If the product does not meet the quality standards at any stage of the process, employees may
force the process to repeat a step. Customers are notified via email about order status and any
critical issues with their orders such as payment failure.
Your base architecture includes AWS Elastic Beanstalk for your website with an RDS MySQL
instance for customer data and orders.
How can you implement the order fulfillment process while making sure that the emails are
delivered reliably?

You would like to create a mirror image of your production environment in another region for
disaster recovery purposes.
Which of the following AWS resources do not need to be recreated in the second region? Choose
2 answers

Your company currently has a 2-tier web application running in an on-premises data center.
You have experienced several infrastructure failures in the past few months resulting in significant
financial losses. Your CIO is strongly considering moving the application to AWS. While working
on achieving buy-In from the other company executives, he asks you to develop a disaster
recovery plan to help improve business continuity in the short term. He specifies a target
Recovery Time Objective (RTO) of 4 hours and a Recovery Point Objective (RPO) of 1 hour or
less. He also asks you to implement the solution within 2 weeks.
Your database is 200GB in size and you have a 20Mbps Internet connection.
How would you do this while minimizing costs?

An international company has deployed a multi-tier web application that relies on DynamoDB in a
single region. For regulatory reasons they need disaster recovery capability in a separate region
with a Recovery Time Objective of 2 hours and a Recovery Point Objective of 24 hours. They
should synchronize their data on a regular basis and be able to provision the web application
rapidly using CloudFormation.
The objective is to minimize changes to the existing web application, control the throughput of
DynamoDB used for the synchronization of data, and synchronize only the modified elements.
Which design would you choose to meet these requirements?

You have deployed a web application, targeting a global audience across multiple AWS Regions
under the domain name example.com.
You decide to use Route53 Latency-Based Routing to serve web requests to users from the
region closest to the user. To provide business continuity in the event of server downtime you
configure weighted record sets associated with two web servers in separate Availability Zones
per region. During a DR test you notice that when you disable all web servers in one of the
regions Route53 does not automatically direct all users to the other region.
What could be happening? Choose 2 answers