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Exam AWS Certified Solutions Architect - Professional topic 1 question 138 discussion

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

Question #: 138
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

An organization is creating a VPC for their application hosting. The organization has created two private subnets in the same AZ and created one subnet in a separate zone.
The organization wants to make a HA system with the internal ELB.
Which of these statements is true with respect to an internal ELB in this scenario?

A. ELB can support only one subnet in each availability zone.
B. ELB does not allow subnet selection; instead it will automatically select all the available subnets of the VPC.
C. If the user is creating an internal ELB, he should use only private subnets.
D. ELB can support all the subnets irrespective of their zones.

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. Within this virtual private cloud, the user can launch AWS resources, such as an ELB, and
EC2 instances.
There are two ELBs available with VPC: internet facing and internal (private) ELB. For internal servers, such as App servers the organization can create an internal load balancer in their VPC and then place back-end application instances behind the internal load balancer.
The internal load balancer will route requests to the back-end application instances, which are also using private IP addresses and only accept requests from the internal load balancer.
The Internal ELB supports only one subnet in each AZ and asks the user to select a subnet while configuring internal ELB.
Reference:
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/USVPC_creating_basic_lb.html

by Gorha at Feb. 16, 2020, 4:33 p.m.

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Comments

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codeScalable

3 months, 1 week ago

Selected Answer: A

A and C are technically correct. But in this context, A would be my answer cos the question has mentioned that he has 2 subnets in the same AZ. I think they are trying to see if you know that you can't use the two subnets in the same AZ even though they are both private

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amministrazione

10 months, 1 week ago

C. If the user is creating an internal ELB, he should use only private subnets.

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SkyZeroZx

2 years ago

Selected Answer: C

The correct answer is C. If the user is creating an internal ELB, he should use only private subnets. Internal Load Balancers (ELBs) are designed to be used within a VPC and cannot be accessed from the public internet. Therefore, they can only be used with private subnets. In the scenario described, the organization has created two private subnets in the same AZ and created one subnet in a separate zone. If they want to create a HA system with the internal ELB, they should use all three subnets.

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michaelbaib

3 years, 1 month ago

i think c is correct as well though A is correct.

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GeniusMikeLiu

3 years, 5 months ago

why c is wrong?

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cldy

3 years, 6 months ago

A. ELB can support only one subnet in each availability zone.

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backfringe

3 years, 6 months ago

I go with A

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01037

3 years, 7 months ago

I finally understand the question. It is A.

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manoj101

3 years, 8 months ago

You can attach at most one subnet per Availability Zone. If you select a subnet from an Availability Zone where there is already an attached subnet, this subnet replaces the currently attached subnet for the Availability Zone.

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fw

3 years, 8 months ago

A is correct. https://docs.aws.amazon.com/elasticloadbalancing/latest/application/create-application-load-balancer.html For Availability Zones, select at least two Availability Zones from your VPC. If there is one subnet for an Availability Zone, it is selected. If there is more than one subnet for an Availability Zone, select one of the subnets. You can select only one subnet per Availability Zone.

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Exam_boy

3 years, 8 months ago

You can attach at most one subnet per Availability Zone https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-create-internal-load-balancer.html

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user0001

3 years, 1 month ago

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SamuelK

3 years, 8 months ago

A: You can attach at most one subnet per Availability Zone. If you select a subnet from an Availability Zone where there is already an attached subnet, this subnet replaces the currently attached subnet for the Availability Zone.

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Gorha

3 years, 9 months ago

which makes C most likely correct. Although, you can create an internal ELB in a public subnet, you should create it in a private subnet. otherwise you want use an internet facing ELB.

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Gorha

3 years, 9 months ago

A is correct, it is the same case for internet facing ELB as well: from the ELB console, while creating an ELB: You can specify only one subnet per Availability Zone. You may also add one Elastic IP per Availability Zone if you wish to have specific addresses for your load balancer.

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