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Exam AWS-SysOps topic 1 question 10 discussion

Exam question from Amazon's AWS-SysOps

Question #: 10
Topic #: 1

An organization has configured a VPC with an Internet Gateway (IGW). pairs of public and private subnets (each with one subnet per Availability Zone), and an
Elastic Load Balancer (ELB) configured to use the public subnets. The application s web tier leverages the ELB. Auto Scaling and a mum-AZ RDS database instance The organization would like to eliminate any potential single points ft failure in this design.
What step should you take to achieve this organization's objective?

A. Nothing, there are no single points of failure in this architecture.
B. Create and attach a second IGW to provide redundant internet connectivity.
C. Create and configure a second Elastic Load Balancer to provide a redundant load balancer.
D. Create a second multi-AZ RDS instance in another Availability Zone and configure replication to provide a redundant database.

Show Suggested Answer

Suggested Answer: A 🗳️
You need multiple ELB if you want HA across regions.
ג€AWS Load Balancer ג€"Cross Network
Many times it happens that after setting up your ELB, you experience significant drops in your performance. The best way to handle this situation is to start with identifying whether your ELB is single AZ or multiple AZ, as single AZ ELB is also considered as one of the Single Points of Failures on AWS Cloud. Once you identify your ELB, it is necessary to make sure ELB loads are kept cross regions.ג€
Reference:
https://www.botmetric.com/blog/eliminating-single-points-of-failures-on-aws-cloud/

by karmaah at Oct. 29, 2019, 2:17 a.m.

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Comments

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pleasespammelater

Highly Voted 2 years, 2 months ago

The answer is "A. Nothing, there are no single points of failure in this architecture". IGW's and ELB's have built in high-availability. RDS is HA if you make it multi-AZ. IGW: https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Internet_Gateway.html ELB: https://aws.amazon.com/elasticloadbalancing/ RDS: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html

upvoted 8 times

AWS_Noob

2 years, 2 months ago

RDS is HA "IF" you configure it for Multi AZ. I stand to be corrected, but it's not a default setting then is it? Unless there is a typo in the question regarding "mum" whatever that is in AWS.

upvoted 1 times

AWS_Noob

2 years, 2 months ago

I think the question does have a Typo: "Auto Scaling and a mum-AZ RDS database instance" should be "Auto Scaling and a multi-AZ RDS database instance" That would then mean the answer is A, as everything else is already HA

upvoted 8 times

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albert_kuo

Most Recent 7 months, 1 week ago

D is correct. Create multi-AZ RDS

upvoted 1 times

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RicardoD

2 years, 2 months ago

A is the answer IGW and ELB are scalable and HA as managed services The deployed RDS is already Multi-AZ, so no need for another one

upvoted 1 times

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waterzhong

2 years, 2 months ago

ELB scales by itself with multiple availability zones configured with it

upvoted 1 times

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mrbreeze

2 years, 2 months ago

A Everything listed is HA. VPC can be attached to only 1 IGW ELB scales by itself with multiple availability zones configured with it Multi AZ requires 2 different AZ for setup and already has a standby

upvoted 4 times

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fagas

2 years, 2 months ago

C should be the right answer: if AZ on which LB is set up fails then its single point of failure best way to have second LB in other AZ. one LB can serve two AZ but that does not mean you have two LBs

upvoted 1 times

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billcayman

2 years, 2 months ago

Answer is A. All points are HA.

upvoted 2 times

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awscertified

2 years, 2 months ago

A. Nothing, there are no single points of failure in this architecture. #> Everything listed in the question is high-available.

upvoted 2 times

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[Removed]

2 years, 3 months ago

Answer is D. https://acloud.guru/forums/aws-certified-sysops-administrator-associate/discussion/-K5eczEPYSkrpWzKtr9I/practice-exam

upvoted 1 times

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karmaah

2 years, 3 months ago

As per explanation, it should be C. I am not sure this question refers an ELB is configured in multiple subnets or subnet. If subnets then, Ans A, Not then C.

upvoted 2 times

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