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Exam ANS-C00 topic 1 question 10 discussion

Exam question from Amazon's ANS-C00

Question #: 10
Topic #: 1

A legacy, on-premises web application cannot be load balanced effectively. There are both planned and unplanned events that cause usage spikes to millions of concurrent users. The existing infrastructure cannot handle the usage spikes. The CIO has mandated that the application be moved to the cloud to avoid further disruptions, with the additional requirement that source IP addresses be unaltered to support network traffic-monitoring needs. Which of the following designs will meet these requirements?

A. Use an Auto Scaling group of Amazon EC2 instances behind a Classic Load Balancer.
B. Use an Auto Scaling group of EC2 instances in a target group behind an Application Load Balancer.
C. Use an Auto Scaling group of EC2 instances in a target group behind a Classic Load Balancer.
D. Use an Auto Scaling group of EC2 instances in a target group behind a Network Load Balancer.

Show Suggested Answer

Suggested Answer: D 🗳️

by aviz at Aug. 18, 2019, 4:39 p.m.

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theCloudCTO

Highly Voted 3 years, 8 months ago

D is the Answer- the Network Load Balancer supports millions of session and the preservation of the source IP natively. https://aws.amazon.com/blogs/aws/new-network-load-balancer-effortless-scaling-to-millions-of-requests-per-second/

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machlo1

Highly Voted 3 years, 8 months ago

" usage spikes to millions of concurrent users" suggest usage of NLB

upvoted 8 times

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PavanKushwah123

Most Recent 2 years, 5 months ago

Correct Answer D

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sapien45

3 years, 3 months ago

With Network Load Balancer, the original source IP address and source ports for the incoming connections remain unmodified, so application software need not support X-Forwarded-For, proxy protocol, or other workarounds. Network Load balancer !

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AzureDP900

3 years, 4 months ago

D is correct.

upvoted 1 times

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StelSen

3 years, 7 months ago

D is correct. Incase if someone have a doubt whether it support Web application. Here it is: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-cfg-nlb.html

upvoted 1 times

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AshishBravo

3 years, 7 months ago

D, Millions of Sessions & Source IP Preservation, these two requirements leads to NLB only.

upvoted 2 times

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ChauPhan

3 years, 7 months ago

D. NLB is correct. 1. It can support million concurrent sessions 2. It support L3/L4 layer

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mamun07

3 years, 8 months ago

Answer D. B could work but the only way ALB can inform of the source IP address is by using the x-forwarded which is in the application header. NLB will handle millions of connections PLUS will send the traffic right through to the server.

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2aldous

3 years, 8 months ago

1. consider use: AWS Bring Your Own IP (BYOIP), to conserve source IP. 2. Create Elastic Network Interface with source IP 3. Use Elastic IP with network load balancer Answe: D

upvoted 3 times

Ishu_awsguy

3 years, 7 months ago

Bro , the wuestion doesnt mean public IP, it meant to reserve private IP (prevent NAT) . NLB will do it. No need of BYOIP

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FireTv

3 years, 8 months ago

D , because "usage spikes to millions" i.e. extreme traffic.

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backfringe

3 years, 8 months ago

it's D

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Ajani

3 years, 8 months ago

Definitely D. NLB scales and works at L4 of the osi. You can assign it a static IP add that can be used for easy integration with monitoring from on-premise

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