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Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 9 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional SAP-C02

Question #: 9
Topic #: 1

[All AWS Certified Solutions Architect - Professional SAP-C02 Questions]

A company is hosting a critical application on a single Amazon EC2 instance. The application uses an Amazon ElastiCache for Redis single-node cluster for an in-memory data store. The application uses an Amazon RDS for MariaDB DB instance for a relational database. For the application to function, each piece of the infrastructure must be healthy and must be in an active state.
A solutions architect needs to improve the application's architecture so that the infrastructure can automatically recover from failure with the least possible downtime.
Which combination of steps will meet these requirements? (Choose three.)

A. Use an Elastic Load Balancer to distribute traffic across multiple EC2 instances. Ensure that the EC2 instances are part of an Auto Scaling group that has a minimum capacity of two instances.
B. Use an Elastic Load Balancer to distribute traffic across multiple EC2 instances. Ensure that the EC2 instances are configured in unlimited mode.
C. Modify the DB instance to create a read replica in the same Availability Zone. Promote the read replica to be the primary DB instance in failure scenarios.
D. Modify the DB instance to create a Multi-AZ deployment that extends across two Availability Zones.
E. Create a replication group for the ElastiCache for Redis cluster. Configure the cluster to use an Auto Scaling group that has a minimum capacity of two instances.
F. Create a replication group for the ElastiCache for Redis cluster. Enable Multi-AZ on the cluster.

Show Suggested Answer

Suggested Answer: ADF 🗳️

by masetromain at Dec. 10, 2022, 6:57 p.m.

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Comments

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masetromain

Highly Voted 2 years, 8 months ago

Selected Answer: ADF

I go with ADF https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/AutoFailover.html

upvoted 16 times

masetromain

11 months ago

A. Using an Elastic Load Balancer (ELB) to distribute traffic across multiple EC2 instances can help ensure that the application remains available in the event that one of the instances becomes unavailable. By configuring the instances as part of an Auto Scaling group with a minimum capacity of two instances, you can ensure that there is always at least one healthy instance to handle traffic. D. Modifying the DB instance to create a Multi-AZ deployment that extends across two availability zones can help ensure that the database remains available in the event of a failure. In the event of a failure, traffic will automatically be directed to the secondary availability zone, reducing the amount of downtime. F. Creating a replication group for the ElastiCache for Redis cluster and enabling Multi-AZ can help ensure that the in-memory data store remains available in the event of a failure. This will allow traffic to be automatically directed to the secondary availability zone, reducing the amount of downtime.

upvoted 11 times

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spencer_sharp

2 years, 8 months ago

Why C is wrong?

upvoted 3 times

Karamen

2 years ago

let suppose in case one of used AZ is failed?

upvoted 1 times

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masetromain

2 years, 7 months ago

Other options like B. and C. does not meet the requirement because the instances are configured in unlimited mode, it will not be possible to ensure that there is always at least one healthy instance to handle traffic if there is a failure.

upvoted 1 times

God_Is_Love

2 years, 6 months ago

Issue with C - Read replica in the same AZ does not sound High availability

upvoted 6 times

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dtha1002

2 years, 2 months ago

in question "can automatically recover from failure with the least possible downtime" C is correct but D is least possible downtime

upvoted 1 times

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princajen

Most Recent 1 month, 2 weeks ago

Selected Answer: ADF

To increase high availability and fault tolerance for a critical application running on EC2, ElastiCache, and RDS, you must ensure recovery and redundancy across all three tiers.

upvoted 1 times

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teeee123

6 months ago

Selected Answer: ADF

ADF try it

upvoted 1 times

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TariqKipkemei

9 months, 3 weeks ago

Selected Answer: ADF

Key words: each piece of the infrastructure must be healthy and must be in an active state, can automatically recover = Auto Scaling group and Multi-AZ deployment

upvoted 1 times

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higashikumi

11 months ago

A, D, E are the correct options to meet the requirements. Option A is correct because an Auto Scaling group with a minimum capacity of two instances and an Elastic Load Balancer distributing traffic across them can provide high availability and automatic recovery from failure. Option D is correct because a Multi-AZ deployment for the RDS instance will ensure that there is a synchronized standby copy of the database in a separate Availability Zone that can be used for automatic failover. Option E is correct because configuring an Auto Scaling group for the ElastiCache for Redis cluster will ensure that there is at least one available node at all times, and automatic recovery can be achieved by launching new instances to replace any failed nodes.

upvoted 1 times

marszalekm

1 year, 7 months ago

There isn't such a thing like "Auto Scaling group for the ElastiCache for Redis", there is a "Replication Group"

upvoted 2 times

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Maja1

11 months ago

Selected Answer: ADF

I wasn't sure if E or F was correct until I read this: "This replacement results in some downtime for the cluster, but if Multi-AZ is enabled, the downtime is minimized. The role of primary node will automatically fail over to one of the read replicas. There is no need to create and provision a new primary node, because ElastiCache will handle this transparently. This failover and replica promotion ensure that you can resume writing to the new primary as soon as promotion is complete." https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/AutoFailover.html

upvoted 4 times

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atirado

11 months ago

Selected Answer: ADF

Option A - Ensures there is always at least a healthy instance responding to requests. Nothing is said about whether the Auto Scaling Group includes multiple AZs (but it must) Option B - No such thing as EC2 Unlimited Mode Option C - Does not provide a place to fail over to Option D - Provides a place to fail over to Option E - Does not provide a place to fail over to Option F - Provides a place to fail over to Choose A, D, F

upvoted 2 times

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amministrazione

11 months, 3 weeks ago

A. Use an Elastic Load Balancer to distribute traffic across multiple EC2 instances. Ensure that the EC2 instances are part of an Auto Scaling group that has a minimum capacity of two instances. D. Modify the DB instance to create a Multi-AZ deployment that extends across two Availability Zones. F. Create a replication group for the ElastiCache for Redis cluster. Enable Multi-AZ on the cluster.

upvoted 1 times

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joshnort

1 year, 3 months ago

Selected Answer: ADF

Satisfies the High Availability requirement on the EC2 instance, Amazon RDS for MariaDB DB instance, and ElastiCache for Redis cluster

upvoted 1 times

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gofavad926

1 year, 5 months ago

Selected Answer: ADF

ADF, as mentioned in the other comments

upvoted 1 times

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DmitriKonnovNN

1 year, 6 months ago

"The infrastructure can automatically recover from failure with the least possible downtime", to me this sounds rather resilient than highly-availible, since it focuses on MITR but not explicitly on up-time.

upvoted 1 times

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