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Exam AWS Certified Solutions Architect - Professional topic 1 question 202 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 202
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

An organization is setting up a highly scalable application using Elastic Beanstalk.
They are using Elastic Load Balancing (ELB) as well as a Virtual Private Cloud (VPC) with public and private subnets. They have the following requirements:
- All the EC2 instances should have a private IP
- All the EC2 instances should receive data via the ELB's.
Which of these will not be needed in this setup?

A. Launch the EC2 instances with only the public subnet.
B. Create routing rules which will route all inbound traffic from ELB to the EC2 instances.
C. Configure ELB and NAT as a part of the public subnet only.
D. Create routing rules which will route all outbound traffic from the EC2 instances through NAT.

Show Suggested Answer

Suggested Answer: A 🗳️
The Amazon Virtual Private Cloud (Amazon VPC) allows the user to define a virtual networking environment in a private, isolated section of the Amazon Web
Services (AWS) cloud. The user has complete control over the virtual networking environment. If the organization wants the Amazon EC2 instances to have a private IP address, he should create a public and private subnet for VPC in each Availability Zone (this is an AWS Elastic Beanstalk requirement). The organization should add their public resources, such as ELB and NAT to the public subnet, and AWC Elastic Beanstalk will assign them unique elastic IP addresses (a static, public IP address). The organization should launch Amazon EC2 instances in a private subnet so that AWS Elastic Beanstalk assigns them non-routable private IP addresses. Now the organization should configure route tables with the following rules:
✑ route all inbound traffic from ELB to EC2 instances
✑ route all outbound traffic from EC2 instances through NAT
Reference:
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/AWSHowTo-vpc.html

by AmazonAu at Dec. 29, 2019, 5:03 a.m.

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Comments

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AmazonAu

Highly Voted 3 years, 8 months ago

A: EC2 in private subnet?

upvoted 8 times

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amministrazione

Most Recent 10 months, 2 weeks ago

A. Launch the EC2 instances with only the public subnet.

upvoted 1 times

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SkyZeroZx

2 years ago

Selected Answer: A

The option that will not be needed in this setup is: A. Launch the EC2 instances with only the public subnet. In a setup with Elastic Beanstalk, Elastic Load Balancing (ELB), and a Virtual Private Cloud (VPC) with public and private subnets, the EC2 instances should be launched in the private subnet. This is because the organization's requirement states that all the EC2 instances should have a private IP. Therefore, option A is not needed as it suggests launching the EC2 instances with only the public subnet, which would not meet the requirement of having private IP addresses for the instances.

upvoted 1 times

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astalavista1

2 years, 8 months ago

Selected Answer: A

http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/AWSHowTo-vpc.html

upvoted 1 times

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hilft

2 years, 11 months ago

A. Why only in the public subnet? You can still receive in private with NAT in public.

upvoted 2 times

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ryu10_09

3 years, 7 months ago

the question is very tricky and annoying. it took me time. it asked: "which of these will UNecessary" -> so A. the other options are necessary more or less

upvoted 1 times

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01037

3 years, 8 months ago

Yes it is A

upvoted 2 times

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blackgamer

3 years, 8 months ago

Likely the question is wrong, B should be answer. But A answer seems to have typo.

upvoted 1 times

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anandbabu

3 years, 8 months ago

D is correct

upvoted 1 times

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palomino

3 years, 8 months ago

So am I the only one that is picking up that answer A says 'public subnet' not private subnet? Which is wrong! A. Launch the EC2 instances with only the public subnet.

upvoted 3 times

ghsotq

3 years, 8 months ago

Please read the question again Which of these will """""NOT""""" be needed in this setup? Answer is A

upvoted 7 times

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