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질문 # 153
A company has a top priority requirement to monitor a few database metrics and then afterward, send email notifications to the Operations team in case there is an issue.
Which AWS services can accomplish this requirement? (Select TWO.)
정답：B,C
설명：
Amazon CloudWatch and Amazon Simple Notification Service (SNS) are correct. In this requirement, you can use Amazon CloudWatch to monitor the database and then Amazon SNS to send the emails to the Operations team. Take note that you should use SNS instead of SES (Simple Email Service) when you want to monitor your EC2 instances.
CloudWatch collects monitoring and operational data in the form of logs, metrics, and events, providing you with a unified view of AWS resources, applications, and services that run on AWS, and on-premises servers.
SNS is a highly available, durable, secure, fully managed pub/sub messaging service that enables you to decouple microservices, distributed systems, and serverless applications.
Amazon Simple Email Service is incorrect. SES is a cloud-based email sending service designed to send notifications and transactional emails.
Amazon Simple Queue Service (SQS) is incorrect. SQS is a fully-managed message queuing service. It does not monitor applications nor send email notifications, unlike SES.
Amazon EC2 Instance with a running Berkeley Internet Name Domain (BIND) Server is incorrect because BIND is primarily used as a Domain Name System (DNS) web service. This is only applicable if you have a private hosted zone in your AWS account. It does not monitor applications nor send email notifications.
References:
https://aws.amazon.com/cloudwatch/
https://aws.amazon.com/sns/
Check out this Amazon CloudWatch Cheat Sheet:
https://tutorialsdojo.com/amazon-cloudwatch/
질문 # 154
An ecommerce company wants to launch a one-deal-a-day website on AWS. Each day will feature exactly one product on sale for a period of 24 hours. The company wants to be able to handle millions of requests each hour with millisecond latency during peak hours.
Which solution will meet these requirements with the LEAST operational overhead?
정답：D
질문 # 155
A company plans to use a durable storage service to store on-premises database backups to the AWS cloud. To move their backup data, they need to use a service that can store and retrieve objects through standard file storage protocols for quick recovery.
Which of the following options will meet this requirement?
정답：B
설명：
File Gateway presents a file-based interface to Amazon S3, which appears as a network file share. It enables you to store and retrieve Amazon S3 objects through standard file storage protocols. File Gateway allows your existing file-based applications or devices to use secure and durable cloud storage without needing to be modified. With File Gateway, your configured S3 buckets will be available as Network File System (NFS) mount points or Server Message Block (SMB) file shares. img src='https://d1.awsstatic.com/cloud-storage/File-Gateway-How-it-Works.6a5ce3c54688864e5b951df9cb8732c4f2926b4.png'>
To store the backup data from on-premises to a durable cloud storage service, you can use File Gateway to store and retrieve objects through standard file storage protocols (SMB or NFS). File Gateway enables your existing file-based applications, devices, and workflows to use Amazon S3, without modification. File Gateway securely and durably stores both file contents and metadata as objects while providing your on-premises applications low-latency access to cached data.
Hence, the correct answer is: Use the AWS Storage Gateway file gateway to store all the backup data in Amazon S3.
The option that says: Use the AWS Storage Gateway volume gateway to store the backup data and directly access it using Amazon S3 API actions is incorrect. Although this is a possible solution, you cannot directly access the volume gateway using Amazon S3 APIs. You should use File Gateway to access your data in Amazon S3.
The option that says: Use Amazon EBS volumes to store all the backup data and attached it to an Amazon EC2 instance is incorrect. Take note that in the scenario, you are required to store the backup data in a durable storage service. An Amazon EBS volume is not highly durable like Amazon S3. Also, file storage protocols such as NFS or SMB, are not directly supported by EBS.
The option that says: Use AWS Snowball Edge to directly backup the data in Amazon S3 Glacier is incorrect because AWS Snowball Edge cannot store and retrieve objects through standard file storage protocols. Also, Snowball Edge can't directly integrate backups to S3 Glacier. References:
https://aws.amazon.com/storagegateway/faqs/
https://aws.amazon.com/s3/storage-classes/
Check out this AWS Storage Gateway Cheat Sheet:
https://tutorialsdojo.com/aws-storage-gateway/
질문 # 156
A Solutions Architect needs to make sure that the On-Demand EC2 instance can only be accessed from this IP address (110.238.98.71) via an SSH connection.
Which configuration below will satisfy this requirement?
정답：D
설명：
A security group acts as a virtual firewall for your instance to control inbound and outbound traffic. When you launch an instance in a VPC, you can assign up to five security groups to the instance. Security groups act at the instance level, not the subnet level. Therefore, each instance in a subnet in your VPC can be assigned to a different set of security groups.
The requirement is to only allow the individual IP of the client and not the entire network. Therefore, the proper CIDR notation should be used. The /32 denotes one IP address and the /0 refers to the entire network. Take note that the SSH protocol uses TCP and port 22.
Hence, the correct answer is: Protocol - TCP, Port Range - 22, Source 110.238.98.71/32 Protocol - UDP, Port Range - 22, Source 110.238.98.71/32 and Protocol - UDP, Port Range - 22, Source 110.238.98.71/0 are incorrect as they are using UDP.
Protocol - TCP, Port Range - 22, Source 110.238.98.71/0 is incorrect because it uses a /0 CIDR notation.
Protocol - TCP, Port Range - 22, Source 110.238.98.71/0 is incorrect because it allows the entire network instead of a single IP.
Explanation:
Reference:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html#security-group-rul es Tutorials Dojo's AWS Certified Solutions Architect Associate Exam Study Guide:
https://tutorialsdojo.com/aws-certified-solutions-architect-associate/
질문 # 157
A company is hosting a high-traffic static website on Amazon S3 with an Amazon CloudFront distribution that has a default TTL of 0 seconds The company wants to implement caching to improve performance for the website However, the company also wants to ensure that stale content Is not served for more than a few minutes after a deployment Which combination of caching methods should a solutions architect implement to meet these requirements? (Select TWO.)
정답：B,D
설명：
Understanding the Requirement: The company wants to improve caching to enhance website performance while ensuring that stale content is not served for more than a few minutes after a deployment.
Analysis of Options:
Set CloudFront TTL: Setting a short TTL (e.g., 2 minutes) ensures that cached content is refreshed frequently, reducing the risk of serving stale content.
S3 Bucket TTL: This would not control the cache duration for the CloudFront distribution.
Cache-Control Private: This directive is for controlling caching by private caches (e.g., browsers) and is not applicable for CloudFront.
Lambda@Edge: While this can add headers dynamically, it adds complexity and operational overhead.
Cache-Control max-age and CloudFront Invalidation: Setting a longer max-age for objects ensures they are cached longer, reducing load on the origin. Invalidation ensures that updated content is refreshed immediately after deployment.
Best Combination of Caching Methods:
Set the CloudFront default TTL to 2 minutes: This balances caching and freshness of content.
Add a Cache-Control max-age directive of 24 hours and use CloudFront invalidation: This ensures efficient caching while providing a mechanism to clear outdated content immediately after a deployment.
Reference:
Amazon CloudFront Caching
Invalidating Files in CloudFront
질문 # 158
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