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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 Hide Answer
Suggested Answer: ADF 🗳️
by masetromain at Dec. 10, 2022, 6:57 p.m.
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masetromain
Highly Voted 2 years, 4 months ago
Selected Answer: ADF
I go with ADF https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/AutoFailover.html
upvoted 16 times
masetromain
7 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, 4 months ago
Why C is wrong?
upvoted 3 times
Karamen
1 year, 8 months ago
let suppose in case one of used AZ is failed?
upvoted 1 times
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masetromain
2 years, 3 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, 2 months ago
Issue with C - Read replica in the same AZ does not sound High availability
upvoted 6 times
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dtha1002
1 year, 11 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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teeee123
Most Recent 2 months ago
Selected Answer: ADF
ADF try it
upvoted 1 times
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TariqKipkemei
5 months, 4 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
7 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, 3 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
7 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
7 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
7 months, 4 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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[Removed]
11 months, 2 weeks ago
ElastiCache for Redis Auto Scaling is limited to the following: Redis (cluster mode enabled) clusters running Redis engine version 6.0 onwards E is out
upvoted 1 times
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joshnort
11 months, 3 weeks 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, 1 month ago
Selected Answer: ADF
ADF, as mentioned in the other comments
upvoted 1 times
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DmitriKonnovNN
1 year, 2 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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severlight
1 year, 5 months ago
Selected Answer: ADF
obvious
upvoted 1 times
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ansgohar
1 year, 7 months ago
Selected Answer: ADF
A, D, F
upvoted 1 times
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NikkyDicky
1 year, 10 months ago
Selected Answer: ADF
it's of course ADF
upvoted 1 times
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Parimal1983
1 year, 10 months ago
Selected Answer: ADF
For high availability, need to spin up instances in another zone with auto scaling and multi AZ options
upvoted 1 times
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rtguru
1 year, 11 months ago
ADF will meet the described provisions
upvoted 1 times
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RunkieMax
1 year, 11 months ago
Selected Answer: ADF
Fit the best the question
upvoted 1 times
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