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NEW QUESTION 49
A company wants to reduce the cost of its existing three-tier web architecture. The web, application, and database servers are running on Amazon EC2 instances for the development, test, and production environments. The EC2 instances average 30% CPU utilization during peak hours and 10% CPU utilization during non-peak hours.
The production EC2 instances run 24 hours a day. The development and test EC2 instances run for at least 8 hours each day. The company plans to implement automation to stop the development and test EC2 instances when they are not in use.
Which EC2 instance purchasing solution will meet the company's requirements MOST cost-effectively?

• A. Use Reserved Instances for the production EC2 instances. Use On-Demand Instances for the development and test EC2 instances.
• B. Use On-Demand Instances for the production EC2 instances. Use Spot blocks for the development and test EC2 instances.
• C. Use Spot blocks for the production EC2 instances. Use Reserved Instances for the development and test EC2 instances.
• D. Use Spot Instances for the production EC2 instances. Use Reserved Instances for the development and test EC2 instances.

Answer: A

NEW QUESTION 50
A top IT Consultancy has a VPC with two On-Demand EC2 instances with Elastic IP addresses. You were notified that the EC2 instances are currently under SSH brute force attacks over the Internet. The IT Security team has identified the IP addresses where these attacks originated. You have to immediately implement a temporary fix to stop these attacks while the team is setting up AWS WAF, GuardDuty, and AWS Shield Advanced to permanently fix the security vulnerability.
Which of the following provides the quickest way to stop the attacks to the instances?

• A. Block the IP addresses in the Network Access Control List
• B. Assign a static Anycast IP address to each EC2 instance
• C. Remove the Internet Gateway from the VPC
• D. Place the EC2 instances into private subnets

Answer: A

Explanation:
A network access control list (ACL) is an optional layer of security for your VPC that acts as a firewall for controlling traffic in and out of one or more subnets. You might set up network ACLs with rules similar to your security groups in order to add an additional layer of security to your VPC.

The following are the basic things that you need to know about network ACLs:
- Your VPC automatically comes with a modifiable default network ACL. By default, it allows all inbound and outbound IPv4 traffic and, if applicable, IPv6 traffic.
- You can create a custom network ACL and associate it with a subnet. By default, each custom network ACL denies all inbound and outbound traffic until you add rules.
- Each subnet in your VPC must be associated with a network ACL. If you don't explicitly associate a subnet with a network ACL, the subnet is automatically associated with the default network ACL.
- You can associate a network ACL with multiple subnets; however, a subnet can be associated with only one network ACL at a time. When you associate a network ACL with a subnet, the previous association is removed.
- A network ACL contains a numbered list of rules that we evaluate in order, starting with the lowest numbered rule, to determine whether traffic is allowed in or out of any subnet associated with the network ACL. The highest number that you can use for a rule is 32766. We recommend that you start by creating rules in increments (for example, increments of 10 or 100) so that you can insert new rules where you need to later on.
- A network ACL has separate inbound and outbound rules, and each rule can either allow or deny traffic.
- Network ACLs are stateless; responses to allowed inbound traffic are subject to the rules for outbound traffic (and vice versa).
The scenario clearly states that it requires the quickest way to fix the security vulnerability. In this situation, you can manually block the offending IP addresses using Network ACLs since the IT Security team already identified the list of offending IP addresses. Alternatively, you can set up a bastion host, however, this option entails additional time to properly set up as you have to configure the security configurations of your bastion host.
Hence, blocking the IP addresses in the Network Access Control List is the best answer since it can quickly resolve the issue by blocking the IP addresses using Network ACL.
Placing the EC2 instances into private subnets is incorrect because if you deploy the EC2 instance in the private subnet without public or EIP address, it would not be accessible over the Internet, even to you.
Removing the Internet Gateway from the VPC is incorrect because doing this will also make your EC2 instance inaccessible to you as it will cut down the connection to the Internet.
Assigning a static Anycast IP address to each EC2 instance is incorrect because a static Anycast IP address is primarily used by AWS Global Accelerator to enable organizations to seamlessly route traffic to multiple regions and improve availability and performance for their end-users.
References: https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ACLs.html
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Security.html Security Group vs NACL:
https://tutorialsdojo.com/security-group-vs-nacl/

NEW QUESTION 51
A company owns an asynchronous API that is used to ingest user requests and, based on the request type, dispatch requests to the appropriate microservice for processing. The company is using Amazon API Gateway to deploy the API front end, and an AWS Lambda function that invokes Amazon DynamoDB to store user requests before dispatching them to the processing microservices.
The company provisioned as much DynamoDB throughput as its budget allows, but the company is still experiencing availability issues and is losing user requests.
What should a solutions architect do to address this issue without impacting existing users?

• A. Use the Amazon Simple Queue Service (Amazon SQS) queue and Lambda to buffer writes to DynamoDB.
• B. Create a secondary index in DynamoDB for the table with the user requests.
• C. Add throttling on the API Gateway with server-side throttling limits.
• D. Use DynamoDB Accelerator (DAX) and Lambda to buffer writes to DynamoDB.

Answer: A

Explanation:
because all other options put some more charges to DynamoDB. But the company supplied as much as they can for DynamoDB. And it is async request and we need to have retry mechanism not to lose the customer data.

NEW QUESTION 52
A solutions architect is formulating a strategy for a startup that needs to transfer 50 TB of on- premises data to Amazon S3. The startup has a slow network transfer speed between its data center and AWS which causes a bottleneck for data migration.
Which of the following should the solutions architect implement?

• A. Enable Amazon S3 Transfer Acceleration on the target S3 bucket.
• B. Integrate AWS Storage Gateway File Gateway with the on-premises data center.
• C. Request an Import Job to Amazon S3 using a Snowball device in the AWS Snowball Console.
• D. Deploy an AWS Migration Hub Discovery agent in the on-premises data center.

Answer: C

Explanation:
AWS Snowball uses secure, rugged devices so you can bring AWS computing and storage capabilities to your edge environments, and transfer data into and out of AWS. The service delivers you Snowball Edge devices with storage and optional Amazon EC2 and AWS IOT Greengrass compute in shippable, hardened, secure cases. With AWS Snowball, you bring cloud capabilities for machine learning, data analytics, processing, and storage to your edge for migrations, short-term data collection, or even long- term deployments. AWS Snowball devices work with or without the internet, do not require a dedicated IT operator, and are designed to be used in remote environments.
Hence, the correct answer is: Request an Import Job to Amazon S3 using a Snowball device in the AWS Snowball Console.
The option that says: Deploy an AWS Migration Hub Discovery agent in the on-premises data center is incorrect. The AWS Migration Hub service is just a central service that provides a single location to track the progress of application migrations across multiple AWS and partner solutions.
The option that says: Enable Amazon S3 Transfer Acceleration on the target S3 bucket is incorrect because this S3 feature is not suitable for large-scale data migration. Enabling this feature won't always guarantee faster data transfer as it's only beneficial for long-distance transfer to and from your Amazon S3 buckets.
The option that says: Integrate AWS Storage Gateway File Gateway with the on-premises data center is incorrect because this service is mostly used for building hybrid cloud solutions where you still need on- premises access to unlimited cloud storage. Based on the scenario, this service is not the best option because you would still rely on the existing low bandwidth internet connection. References:
https://aws.amazon.com/snowball
https://aws.amazon.com/blogs/storage/making-it-even-simpler-to-create-and-manage-your-aws-snow-fa mily-jobs/ Check out this AWS Snowball Cheat Sheet:
https://tutorialsdojo.com/aws-snowball/
AWS Snow Family Overview:
https://www.youtube.com/watch?v=9Ar-51Ip53Q

NEW QUESTION 53
A Solutions Architect is working for a large IT consulting firm. One of the clients is launching a file sharing web application in AWS which requires a durable storage service for hosting their static contents such as PDFs, Word Documents, high-resolution images, and many others.
Which type of storage service should the Architect use to meet this requirement?

• A. Amazon EC2 instance store
• B. Amazon S3
• C. Amazon RDS instance
• D. Amazon EBS volume

Answer: B

Explanation:
Amazon S3 is storage for the Internet. It's a simple storage service that offers software developers a durable, highly-scalable, reliable, and low-latency data storage infrastructure at very low costs. Amazon S3 provides customers with a highly durable storage infrastructure. Versioning offers an additional level of protection by providing a means of recovery when customers accidentally overwrite or delete objects.
Remember that the scenario requires a durable storage for static content. These two keywords are actually referring to S3, since it is highly durable and suitable for storing static content. Hence, Amazon S3 is the correct answer.


Amazon EBS volume is incorrect because this is not as durable compared with S3. In addition, it is best to store the static contents in S3 rather than EBS.
Amazon EC2 instance store is incorrect because it is definitely not suitable - the data it holds will be wiped out immediately once the EC2 instance is restarted.
Amazon RDS instance is incorrect because an RDS instance is just a database and not suitable for storing static content. By default, RDS is not durable, unless you launch it to be in Multi-AZ deployments configuration.
Explanation:
Reference:
https://aws.amazon.com/s3/faqs/
https://d1.awsstatic.com/whitepapers/Storage/AWS%20Storage%20Services%20Whitepaper-v9.pdf#pa ge=24 Check out this Amazon S3 Cheat Sheet:
https://tutorialsdojo.com/amazon-s3/

NEW QUESTION 54
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