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Amazon AWS Certified Solutions Architect - Associate (SAA-C02) Sample Questions (Q376-Q381):

NEW QUESTION # 376
Your EBS volumes do not seem to be performing as expected and your team leader has requested you look into improving their performance. Which of the following is not a true statement relating to the performance of your EBS volumes?

  • A. General Purpose (SSD) and Provisioned IOPS (SSD) volumes have a throughput limit of 128 MB/s per volume.
  • B. Frequent snapshots provide a higher level of data durability and they will not degrade the performance of your application while the snapshot is in progress.
  • C. There is a 5 to 50 percent reduction in IOPS when you first access each block of data on a newly created or restored EBS volume
  • D. There is a relationship between the maximum performance of your EBS volumes, the amount of I/O you are driving to them, and the amount of time it takes for each transaction to complete.

Answer: B

Explanation:
Several factors can affect the performance of Amazon EBS volumes, such as instance configuration, I/O characteristics, workload demand, and storage configuration. Frequent snapshots provide a higher level of data durability, but they may slightly degrade the performance of your application while the snapshot is in progress. This trade off becomes critical when you have data that changes rapidly. Whenever possible, plan for snapshots to occur during off-peak times in order to minimize workload impact.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSPerformance.html


NEW QUESTION # 377
A solutions architect designed a system based on amazon kinesis data streams. After the workflow was put into production, the company noticed it performed slowly and identified kinesis data streams as the problem.
One of the streams has a total of 10 Mb's throughput?
What should the solutions architect recommend to improve performance?

  • A. Run the update shardCount command to increase the number of shards in the stream.
  • B. Change the workflow to use amazon kinesis data firehouse to gain a higher throughput.
  • C. Run the Mergeshard command to reduce the number of shards that the consumer can move easily process.
  • D. Use AWS lambda to preprocess the data and transform the records into a simpler format, such as CSV.

Answer: A


NEW QUESTION # 378
You are architecting a web application that will be backed by a relational database. The application will be read-heavy, and database queries will be computationally intensive.
How can you improve overall application response for users?

  • A. Use Amazon SQS to distribute messages among workers that are less busy
  • B. Use an Auto Scaling group and ELB Classic Load Balancer for the application tier
  • C. Use ElastiCache to store critical pieces of data in memory for low-latency access
  • D. Use data Pipeline to replicate your relational data across all of your web tier nodes

Answer: D


NEW QUESTION # 379
A company is running a batch application on Amazon EC2 instances The application consists of a backend with multiple Amazon RDS databases The application is causing a high number of reads on the databases A solutions architect must reduce the number of database reads while ensuring high availability.
What should the solutions architect do to meet this requirement?

  • A. Use Amazon Route 53 DNS caching
  • B. Add Amazon RDS read replicas.
  • C. Use Amazon ElastiCache for Memcached
  • D. Use Amazon ElastiCache for Redis

Answer: B


NEW QUESTION # 380
Once the user has set ElastiCache for an application and it is up and running, which services, does Amazon not provide for the user:

  • A. Automating common administrative tasks such as failure detection and recovery, and software patching.
  • B. Providing detailed monitoring metrics associated with your Cache Nodes, enabling you to diagnose and react to issues very quickly
  • C. The ability for client programs to automatically identify all of the nodes in a cache cluster, and to initiate and maintain connections to all of these nodes
  • D. Providing default Time to Live (TTL) in the AWS Elasticache Redis Implementation for different type of data.

Answer: D

Explanation:
Amazon provides failure detection and recovery, and software patching and monitoring tools which is called CloudWatch. In addition it provides also Auto Discovery to automatically identify and initialize all nodes of cache cluster for Amazon ElastiCache.
Reference:
http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/WhatIs.html


NEW QUESTION # 381
......

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