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Exam AWS Certified Solutions Architect - Professional topic 1 question 163 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 163
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

An organization is setting up an application on AWS to have both High Availability (HA) and Disaster Recovery (DR). The organization wants to have both
Recovery point objective (RPO) and Recovery time objective (RTO) of 10 minutes.
Which of the below mentioned service configurations does not help the organization achieve the said RPO and RTO?

  • A. Take a snapshot of the data every 10 minutes and copy it to the other region.
  • B. Use an elastic IP to assign to a running instance and use Route 53 to map the user's domain with that IP.
  • C. Create ELB with multi-region routing to allow automated failover when required.
  • D. Use an AMI copy to keep the AMI available in other regions.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
AWS provides an on demand, scalable infrastructure. AWS EC2 allows the user to launch On- Demand instances and the organization should create an AMI of the running instance. Copy the AMI to another region to enable Disaster Recovery (DR) in case of region failure. The organization should also use EBS for persistent storage and take a snapshot every 10 minutes to meet Recovery time objective (RTO). They should also setup an elastic IP and use it with Route 53 to route requests to the same IP. When one of the instances fails the organization can launch new instances and assign the same EIP to a new instance to achieve
High Availability (HA). The ELB works only for a particular region and does not route requests across regions.
Reference:
http://d36cz9buwru1tt.cloudfront.net/AWS_Disaster_Recovery.pdf
by Warrenn at Oct. 26, 2019, 12:26 p.m.
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examacc
Highly Voted 3 years, 5 months ago
elb cannot do multi region routing.,. this questions does not make sense neither does answers
upvoted 12 times
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codeScalable
Most Recent 21 hours, 57 minutes ago
Selected Answer: C
C. ELB is single region, though multi AZ
upvoted 1 times
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amministrazione
7 months ago
C. Create ELB with multi-region routing to allow automated failover when required.
upvoted 1 times
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Anhdd
2 years, 9 months ago
Should be C due to the following: "Amazon has their own Elastic Load Balancer, but it only works to distribute traffic within a region. And while it supports load balancing between availability zones within the same region, it does not allow you to distribute traffic to another region, unless you want to use DNS, which is less than ideal"
upvoted 2 times
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LiamNg
2 years, 10 months ago
Selected Answer: C
Anwser C is only valid if the LB is behind Route 53. C is the Answer. Ref https://aws.amazon.com/elasticloadbalancing/faqs/ Q: Does Network Load Balancer support DNS regional and zonal fail-over? A: Yes, you can use Amazon Route 53 health checking and DNS failover features to enhance the availability of the applications running behind Network Load Balancers.
upvoted 1 times
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Riho
3 years, 2 months ago
Seems like question is just taken from doc. Option C is wrong, but option B is also not giving anything in the point of RPO or RTO . And yes, A is also wrong - while once in 10 minute snapshot is making RPO bigger than 10 min. Taking snapshot and transferring snapshot is taking time...
upvoted 1 times
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cldy
3 years, 3 months ago
C. Create ELB with multi-region routing to allow automated failover when required.
upvoted 2 times
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01037
3 years, 4 months ago
Answer is C ELB work only in region
upvoted 2 times
bamjive06
3 years, 4 months ago
Correct, unless cross-zone
upvoted 1 times
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aimar047
3 years, 4 months ago
All options given can be correct (except C as ELB does not balance/reroute cross regions). Correct options mean not helping to achieve RTO/RPO of 10 min.. A/C/D are incorrect , snapshotting and copying cross regions is long run or AMI will take definitely more than 10 minutes.. not sure if the question is valid tbh
upvoted 1 times
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MichaelHuang
3 years, 4 months ago
The Answer is A: A. 10 mins snapshot interval will not achieve 10 min RTO/RPO B. Use an elastic IP to assign to a running instance and use Route 53 to map the user's domain with that IP. C. Create ELB with multi-region routing to allow automated failover when required. D. Use an AMI copy to keep the AMI available in other regions.
upvoted 1 times
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fullaws
3 years, 4 months ago
C is correct
upvoted 1 times
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learner4ever
3 years, 4 months ago
C is the right answer
upvoted 1 times
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oatif
3 years, 4 months ago
B. ELB cannot span multiple regions only multiple zones.
upvoted 1 times
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NKnab
3 years, 5 months ago
Question is about which one doesn't help. Elb is not multiregion.
upvoted 1 times
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Socrates
3 years, 5 months ago
B is correct, an IP is just an identifier to a network resource
upvoted 1 times
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sergza
3 years, 5 months ago
i think it is C. Note the question states "Does not help" You could have multiple EIP and have Route 53 policy to iterate between them for HA
upvoted 2 times
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cloudinvader
3 years, 5 months ago
Elastic IP Address and ELB both are regional services (per region). In the case of DR, how can we use EIP??
upvoted 1 times
01037
3 years, 4 months ago
I think it wants to you can change domain to another up when something happens.
upvoted 2 times
user0001
2 years, 10 months ago
you are right
upvoted 1 times
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