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NEW QUESTION 52
A company's HTTP application is behind a Network Load Balancer (NLB). The NLB's target group is configured to use an Amazon EC2 Auto Scaling group with multiple EC2 instances that run the web service.
The company notices that the NLB is not detecting HTTP errors for the application. These errors require a manual restart of the EC2 instances that run the web service. The company needs to improve the application's availability without writing custom scripts or code.
What should a solutions architect do to meet these requirements?
- A. Replace the NLB with an Application Load Balancer. Enable HTTP health checks by supplying the URL of the company's application. Configure an Auto Scaling action to replace unhealthy instances.
- B. Enable HTTP health checks on the NLB. supplying the URL of the company's application.
- C. Create an Amazon Cloud Watch alarm that monitors the UnhealthyHostCount metric for the NLB. Configure an Auto Scaling action to replace unhealthy instances when the alarm is in the ALARM state.
- D. Add a cron job to the EC2 instances to check the local application's logs once each minute. If HTTP errors are detected, the application will restart.
Answer: A
NEW QUESTION 53
A news company is planning to use a Hardware Security Module (CloudHSM) in AWS for secure key storage of their web applications. You have launched the CloudHSM cluster but after just a few hours, a support staff mistakenly attempted to log in as the administrator three times using an invalid password in the Hardware Security Module. This has caused the HSM to be zeroized, which means that the encryption keys on it have been wiped. Unfortunately, you did not have a copy of the keys stored anywhere else.
How can you obtain a new copy of the keys that you have stored on Hardware Security Module?
- A. Use the Amazon CLI to get a copy of the keys.
- B. Restore a snapshot of the Hardware Security Module.
- C. Contact AWS Support and they will provide you a copy of the keys.
- D. The keys are lost permanently if you did not have a copy.
Answer: D
Explanation:
Attempting to log in as the administrator more than twice with the wrong password zeroizes your HSM appliance. When an HSM is zeroized, all keys, certificates, and other data on the HSM is destroyed. You can use your cluster's security group to prevent an unauthenticated user from zeroizing your HSM.
Amazon does not have access to your keys nor to the credentials of your Hardware Security Module (HSM) and therefore has no way to recover your keys if you lose your credentials. Amazon strongly recommends that you use two or more HSMs in separate Availability Zones in any production CloudHSM Cluster to avoid loss of cryptographic keys.
Refer to the CloudHSM FAQs for reference:
Q: Could I lose my keys if a single HSM instance fails?
NEW QUESTION 54
An ecommerce company has an order-processing application that uses Amazon API Gateway and an AWS Lambda function. The application stores data in an Amazon Aurora PostgreSQL database. During a recent sales event, a sudden surge in customer orders occurred. Some customers experienced timeouts and the application did not process the orders of those customers A solutions architect determined that the CPU utilization and memory utilization were high on the database because of a large number of open connections The solutions architect needs to prevent the timeout errors while making the least possible changes to the application.
Which solution will meet these requirements?
- A. Configure provisioned concurrency for the Lambda function Modify the database to be a global database in multiple AWS Regions
- B. Use Amazon RDS Proxy to create a proxy for the database Modify the Lambda function to use the RDS Proxy endpoint instead of the database endpoint
- C. Migrate the data from Aurora PostgreSQL to Amazon DynamoDB by using AWS Database Migration Service (AWS DMS| Modify the Lambda function to use the OynamoDB table
- D. Create a read replica for the database in a different AWS Region Use query string parameters in API Gateway to route traffic to the read replica
Answer: C
NEW QUESTION 55
A company plans to migrate a NoSQL database to an EC2 instance. The database is configured to replicate the data automatically to keep multiple copies of data for redundancy. The Solutions Architect needs to launch an instance that has a high IOPS and sequential read/write access.
Which of the following options fulfills the requirement if I/O throughput is the highest priority?
- A. Use General purpose instances with EBS volume.
- B. Use Storage optimized instances with instance store volume.
- C. Use Memory optimized instances with EBS volume.
- D. Use Compute optimized instance with instance store volume.
Answer: B
Explanation:
Amazon EC2 provides a wide selection of instance types optimized to fit different use cases. Instance types comprise varying combinations of CPU, memory, storage, and networking capacity and give you the flexibility to choose the appropriate mix of resources for your applications. Each instance type includes one or more instance sizes, allowing you to scale your resources to the requirements of your target workload.
A storage optimized instance is designed for workloads that require high, sequential read and write access to very large data sets on local storage. They are optimized to deliver tens of thousands of low- latency, random I/O operations per second (IOPS) to applications. Some instance types can drive more I/O throughput than what you can provision for a single EBS volume. You can join multiple volumes together in a RAID 0 configuration to use the available bandwidth for these instances.
Based on the given scenario, the NoSQL database will be migrated to an EC2 instance. The suitable instance type for NoSQL database is I3 and I3en instances. Also, the primary data storage for I3 and I3en instances is non-volatile memory express (NVMe) SSD instance store volumes. Since the data is replicated automatically, there will be no problem using an instance store volume.
Hence, the correct answer is: Use Storage optimized instances with instance store volume.
The option that says: Use Compute optimized instances with instance store volume is incorrect because this type of instance is ideal for compute-bound applications that benefit from high-performance processors. It is not suitable for a NoSQL database.
The option that says: Use General purpose instances with EBS volume is incorrect because this instance only provides a balance of computing, memory, and networking resources. Take note that the requirement in the scenario is high sequential read and write access. Therefore, you must use a storage optimized instance.
The option that says: Use Memory optimized instances with EBS volume is incorrect. Although this type of instance is suitable for a NoSQL database, it is not designed for workloads that require high, sequential read and write access to very large data sets on local storage.
References:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/storage-optimized-instances.html
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html Amazon EC2 Overview:
https://www.youtube.com/watch?v=7VsGIHT_jQE
Check out this Amazon EC2 Cheat Sheet:
https://tutorialsdojo.com/amazon-elastic-compute-cloud-amazon-ec2/
NEW QUESTION 56
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