Exam AWS Certified Solutions Architect - Professional topic 1 question 352 discussion

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

Question #: 352
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

Someone is creating a VPC for their application hosting. He has created two private subnets in the same availability zone and created one subnet in a separate availability zone. He wants to make a High Availability system with an internal Elastic Load Balancer.
Which choice is true regarding internal ELBs in this scenario? (Choose two.)

A. Internal ELBs should only be launched within private subnets.
B. Amazon ELB service does not allow subnet selection; instead it will automatically select all the available subnets of the VPC.
C. Internal ELBs can support only one subnet in each availability zone.
D. An internal ELB can support all the subnets irrespective of their zones.

Show Suggested Answer

Suggested Answer: AC 🗳️
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 elastic load balancers, 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 lifebegins at Sept. 21, 2021, 6:39 a.m.

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Comments

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SkyZeroZx

2 years ago

Selected Answer: AC

The correct answers are A and C. Explanation: Internal ELBs should only be launched within private subnets. This is because internal ELBs are not exposed to the internet, so they can only be accessed by instances that are in the same VPC. Amazon ELB service allows subnet selection. You can choose which subnets you want to associate with your ELB. This is important for high availability, as you can distribute your ELB across multiple subnets in different availability zones. Internal ELBs can support only one subnet in each availability zone. This is because each subnet is in a different availability zone, and the ELB needs to be able to reach all of the instances in the subnets. The other two statements are incorrect. Amazon ELB service does allow subnet selection, and an internal ELB cannot support all the subnets irrespective of their zones.

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challenger1

3 years, 6 months ago

My Answer: A & C

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moon2351

3 years, 8 months ago

Answer is A&C

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lifebegins

3 years, 8 months ago

Answer is A & C, D also possible only if you enable Cross-Zone Load Balancing If cross-zone load balancing is enabled, each node is connected to each back-end instance, regardless of Availability Zone. Otherwise, each node is connected only to the instances that are in its Availability Zone. https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-internal-load-balancers.html

upvoted 3 times

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