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Exam AWS Certified Solutions Architect - Professional topic 1 question 110 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 110
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A 3-Ber e-commerce web application is currently deployed on-premises, and will be migrated to AWS for greater scalability and elasticity. The web tier currently shares read-only data using a network distributed file system. The app server tier uses a clustering mechanism for discovery and shared session state that depends on IP multicast. The database tier uses shared-storage clustering to provide database failover capability, and uses several read slaves for scaling. Data on all servers and the distributed file system directory is backed up weekly to off-site tapes.
Which AWS storage and database architecture meets the requirements of the application?

  • A. Web servers: store read-only data in S3, and copy from S3 to root volume at boot time. App servers: share state using a combination of DynamoDB and IP unicast. Database: use RDS with multi-AZ deployment and one or more read replicas. Backup: web servers, app servers, and database backed up weekly to Glacier using snapshots.
  • B. Web servers: store read-only data in an EC2 NFS server, mount to each web server at boot time. App servers: share state using a combination of DynamoDB and IP multicast. Database: use RDS with multi- AZ deployment and one or more Read Replicas. Backup: web and app servers backed up weekly via AMIs, database backed up via DB snapshots.
  • C. Web servers: store read-only data in S3, and copy from S3 to root volume at boot time. App servers: share state using a combination of DynamoDB and IP unicast. Database: use RDS with multi-AZ deployment and one or more Read Replicas. Backup: web and app servers backed up weekly via AMIs, database backed up via DB snapshots.
  • D. Web servers: store read-only data in S3, and copy from S3 to root volume at boot time App servers: share state using a combination of DynamoDB and IP unicast. Database: use RDS with multi-AZ deployment. Backup: web and app servers backed up weekly via AMIs, database backed up via DB snapshots.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
Amazon Glacier doesn't suit all storage situations. Listed following are a few storage needs for which you should consider other AWS storage options instead of
Amazon Glacier.
Data that must be updated very frequently might be better served by a storage solution with lower read/write latencies, such as Amazon EBS, Amazon RDS,
Amazon DynamoDB, or relational databases running on EC2.
Reference:
https://d0.awsstatic.com/whitepapers/Storage/AWS%20Storage%20Services%20Whitepaper-v9.pdf
by kenkool at April 6, 2021, 3:21 p.m.
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amministrazione
8 months, 3 weeks ago
C. Web servers: store read-only data in S3, and copy from S3 to root volume at boot time. App servers: share state using a combination of DynamoDB and IP unicast. Database: use RDS with multi-AZ deployment and one or more Read Replicas. Backup: web and app servers backed up weekly via AMIs, database backed up via DB snapshots.
upvoted 1 times
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Khannas
2 years, 8 months ago
C. Same question as 87
upvoted 3 times
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welcomeYM
2 years, 8 months ago
Selected Answer: C
CCCCCC
upvoted 2 times
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AwsSuperTrooper
3 years, 4 months ago
I conclude answer C by means of elimination: A -> database backup to glacier is not possible B -> IP multicast is not supported D -> no read slaves as needed per requirements
upvoted 2 times
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AwsSuperTrooper
3 years, 4 months ago
I conclude answer D by means of elimination: A -> database backup to glacier is not possible B -> IP multicast is not supported D -> no read slaves as needed per requirements
upvoted 1 times
AwsSuperTrooper
3 years, 4 months ago
Should be C instead of D ;-(
upvoted 1 times
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cldy
3 years, 5 months ago
B. Web servers: store read-only data in an EC2 NFS server; mount to each web server at boot time. App servers: share state using a combination of DynamoDB and IP multicast. Database: use RDS with multi-AZ deployment and one or more Read Replicas. Backup: web and app servers backed up weekly via AMIs, database backed up via DB snapshots.
upvoted 1 times
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Kinnam
3 years, 6 months ago
Repeated question, refer to No.87. Answer is C.
upvoted 1 times
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01037
3 years, 6 months ago
If B is using EFS, I'll choose B. Is it really a good idea of "copy from S3 to root volume at boot time"?
upvoted 3 times
vbal
3 years, 4 months ago
Dynamo DB & Multicast?
upvoted 1 times
vbal
3 years, 4 months ago
B is right choice.
upvoted 1 times
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hess
3 years, 6 months ago
You cannot store snapshots directly in glacier, so the answer should be C.
upvoted 1 times
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ExtHo
3 years, 7 months ago
This question seems old now AWS support IP multicast so NFS for shared file system than coping data at booting.
upvoted 1 times
wahlbergusa
3 years, 3 months ago
IP multicast is supported only by TGW and that has to be used in conjunction with GRE tunnels. No way it is supported within a VPC.
upvoted 1 times
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kenkool
3 years, 7 months ago
Answer is B. NFS for shared file system.
upvoted 2 times
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