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Exam AWS Certified Solutions Architect - Professional topic 1 question 49 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 49
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

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 two months resulting in significant financial losses. Your CIO is strongly agreeing to move 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?

  • A. Create an EBS backed private AMI which includes a fresh install of your application. Develop a CloudFormation template which includes your AMI and the required EC2, AutoScaling, and ELB resources to support deploying the application across Multiple- Availability-Zones. Asynchronously replicate transactions from your on-premises database to a database instance in AWS across a secure VPN connection.
  • B. Deploy your application on EC2 instances within an Auto Scaling group across multiple availability zones. Asynchronously replicate transactions from your on- premises database to a database instance in AWS across a secure VPN connection.
  • C. Create an EBS backed private AMI which includes a fresh install of your application. Setup a script in your data center to backup the local database every 1 hour and to encrypt and copy the resulting file to an S3 bucket using multi-part upload.
  • D. Install your application on a compute-optimized EC2 instance capable of supporting the application's average load. Synchronously replicate transactions from your on-premises database to a database instance in AWS across a secure Direct Connect connection.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Dgix at March 30, 2021, 3:26 p.m.
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saptati
Highly Voted 3 years, 4 months ago
C is not the r8 option. What if the DR stikes while copying the DB dumps to S3, it won't be able to fulfil the RPO of 1 hour or less. Becoz the DB copy is sent every 1 hour and also it will take some time to copy the dumps to S3. In that case, the latest copy available will be 2 hrs back. Also, we can eliminate B as it doesn't talk abt AMI backup and D, as well becoz Direct connect, is expensive. Thus, the r8 answer is A.
upvoted 13 times
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Dgix
Highly Voted 3 years, 7 months ago
C. No mention is made of migrating the database, only of preparing for a DR situation.
upvoted 5 times
Yahowmy
3 years, 6 months ago
There is a requirement of moving to AWS.
upvoted 1 times
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student22
Most Recent 6 months ago
Selected Answer: A
A - Minimizes the cost
upvoted 1 times
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amministrazione
8 months, 3 weeks ago
B. Deploy your application on EC2 instances within an Auto Scaling group across multiple availability zones. Asynchronously replicate transactions from your on- premises database to a database instance in AWS across a secure VPN connection.
upvoted 1 times
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TravelKo
1 year, 9 months ago
Selected Answer: A
Option A minimizes the costs.
upvoted 1 times
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kondratyevmn
1 year, 9 months ago
Selected Answer: A
A - Should be a viable solution. ~ 9 days to transfer DB to the cloud over this internet connectivity = 20Mbps, and do asynchronous replicate pransactions over VPN. In case of DR, - run a CloudFormation template and re-configure stack to use DB. 4 hours RTO and 1 hour RPO seems to be achievable in this case and also minimal costs, as only DB should run in Cloud. B - no, multiple AZ deployment contradict the costs constrains C - no, why would you want to use S3 at all here? D - too expensive, doesn't meet the cost constraint.
upvoted 1 times
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CloudHandsOn
2 years, 1 month ago
A is the correct answer. creating a DR between AWS and on-prem will require some type of connection, which the VPN provides. Also, setting up CF with all of the AWS resources will allow us to have that setup in place in case of an issue
upvoted 1 times
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TigerInTheCloud
2 years, 4 months ago
Selected Answer: A
D. Direct connection is too expensive on cost (still need achieving buy-in from the other company executives) and time (2 weeks may not enough) C. 20Mbp connection internet connection is an issue A and B are similar. A is better on RTO with automatical (CloudFormation) deployment with the pre-installed application. The initial transferring 200GB is an issue not addressed (need snowball). However, among the answers, A is the best one.
upvoted 1 times
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davideccc
2 years, 7 months ago
Selected Answer: A
A and B are similar but B is active-active while A leverages a cloudformation template to spin up and start the environment. This is a key point since one of the requirements is to minimize cost and RTO is 4 hours. With this timeframe you will be comfortably re-create your environment with Cloudformation and save a lot of money since you don't need to keep the EC2 up and running 24/7
upvoted 2 times
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kaushik9845
2 years, 7 months ago
To move 200GB data with 20Mbps it takes ~22 days. 200*8(bits)*1000M/20M/60min*60s..How can a db setup be done in aws in 2 weeks?
upvoted 1 times
EricZhang
2 years, 4 months ago
20Mbps ≈ 2MB per second = 7.2G per hour = 172.8G per day
upvoted 2 times
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fukami_ymir
2 years, 9 months ago
Selected Answer: B
I think it's B. C is bad since backup to S3 required a lot of time and won't fit the RPO at all. A is good but the question wants a temporary solution with lower cost so ELB is not necessary.
upvoted 3 times
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hilft
2 years, 9 months ago
Confused. C seems an option with DR, A is something more with migration and DR. Forum seems to go for C
upvoted 1 times
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virtual
3 years ago
RTO=4 and RPO <=1. So: D with sync. replication is wrong because not accurate with RPO and would result in high costing ... C (full)back ups the local database: this is not a solution for an RPO of approx. one hour. A and B are both async. replication (that is good). The difference is A going with CloudFormation, so my choice is A.
upvoted 1 times
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tkanmani76
3 years, 3 months ago
C preserves 1 hr backup data - When DR happens we can use that backup to restore instance. This the only option which maps to RPO of 1hr. In case of A - when DR happens we can use the AMI to setup the instance. We havent got any snapshot of data in this case and we have replicate the full 200GB data - doesnt look good considering the bandwidth availability.
upvoted 1 times
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dv1
3 years, 4 months ago
Question asks for a short term DR solution UNTIL the AWS Migration is approved by all stakeholders. I will go C.
upvoted 1 times
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Madhu654
3 years, 5 months ago
A,B are incorrect with a 20Mbps internet connection you can copy as much a 50GB of data within 2 weeks Answer is C C hourly backup to S3 seems a viable option D could have been correct if there isn't a 2week time constraint.. Direct Connect connections can take anytime between 2weeks to month to setup
upvoted 1 times
javiems
3 years, 5 months ago
20 Mbps = 2 MBps approx. 2 x 60 seconds x 60 minutes x 24 hours = 172.800 MBps (172 GB approx)
upvoted 1 times
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ohasnaoui
2 years, 1 month ago
Don't forget that the solution should be the most cost-effectif
upvoted 1 times
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ExtHo
3 years, 6 months ago
A https://jayendrapatil.com/tag/disaster-recovery/
upvoted 2 times
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