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問題 #159
A company is building a new application that uses multiple serverless architecture components.
The application architecture includes an Amazon API Gateway REST API and AWS Lambda functions to manage incoming requests. The company needs a service to send messages that the REST API receives to multiple target Lambda functions for processing. The service must filter messages so each target Lambda function receives only the messages the function needs.
Which solution will meet these requirements with the LEAST operational overhead?
答案：C
問題 #160
A company needs to store its accounting records in Amazon S3. The records must be immediately accessible for 1 year and then must be archived for an additional 9 years. No one at the company, including administrative users and root users, can be able to delete the records during the entire 10-year period. The records must be stored with maximum resiliency.
Which solution will meet these requirements?
答案：A
解題說明：
To meet the requirements of immediately accessible records for 1 year and then archived for an additional 9 years with maximum resiliency, we can use S3 Lifecycle policy to transition records from S3 Standard to S3 Glacier Deep Archive after 1 year. And to ensure that the records cannot be deleted by anyone, including administrative and root users, we can use S3 Object Lock in compliance mode for a period of 10 years.
Therefore, the correct answer is option C.
Reference: https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-lock.html
問題 #161
A company wants to migrate an application that processes logs to AWS. Currently, the application runs on an on-premises storage area network (SAN).
The application reads and processes large log files sequentially. The application requires throughput of up to 500 MBps.
A solutions architect needs to migrate the application with minimal change to the application architecture.
Which solution will meet these requirements in the MOST cost-effective way?
答案：B
解題說明：
Throughput Optimized HDD (st1) is the correct and most cost-effective EBS choice because the workload reads and processes large log files sequentially. AWS defines st1 volumes as low-cost magnetic storage designed for frequently accessed, throughput-intensive workloads, including log processing. This workload does not require high random IOPS or ultra-low latency, so gp3 and io1 would be more expensive than necessary. Cold HDD (sc1) is cheaper but intended for less frequently accessed data, so it is not appropriate for an active log-processing application.
Because the company wants minimal architectural change from SAN-based block storage, an EBS volume preserves the block-storage model while meeting the sequential throughput requirement.
問題 #162
A developer used the AWS SDK to create an application that aggregates and produces log records for 10 services. The application delivers data to an Amazon Kinesis Data Streams stream.
Each record contains a log message with a service name, creation timestamp, and other log information. The stream has 15 shards in provisioned capacity mode. The stream uses service name as the partition key.
The developer notices that when all the services are producing logs,
ProvisionedThroughputExceededException errors occur during PutRecord requests. The stream metrics show that the write capacity the applications use is below the provisioned capacity.
How should the developer resolve this issue?
答案：D
解題說明：
* Partition Key Issue:
* Using "service name" as the partition key results in uneven data distribution. Some shards may become hot due to excessive logs from certain services, leading to throttling errors.
* Changing the partition key to "creation timestamp" ensures a more even distribution of records across shards.
* Incorrect Options Analysis:
* Option A: On-demand capacity mode eliminates throughput management but is more expensive and does not address the root cause.
* Option B: Adding more shards does not solve the issue if the partition key still creates hot shards.
* Option D: Using separate streams increases complexity and is unnecessary.
References:
* Kinesis Data Streams Partition Key Best Practices
問題 #163
[Design Secure Architectures]
A company hosts an application on Amazon EC2 instances that are part of a target group behind an Application Load Balancer (ALB). The company has attached a security group to the ALB.
During a recent review of application logs, the company found many unauthorized login attempts from IP addresses that belong to countries outside the company's normal user base. The company wants to allow traffic only from the United States and Australia.
答案：B
解題說明：
Why Option B is Correct:
AWS WAF: Provides a simple way to create geographic match rules to block or allow traffic based on country IP ranges.
Least Operational Overhead: Attaching the WAF rule to the ALB ensures centralized control without modifying ACLs or instance firewalls.
Why Other Options Are Not Ideal:
Option A: Network ACLs operate at the subnet level and can become complex to manage for dynamic or evolving IP ranges.
Option C: Managing IP-based rules in security groups and ACLs lacks scalability and does not provide country-based filtering.
Option D: Configuring host-based firewalls increases operational overhead and does not leverage AWS-managed solutions.
AWS Reference:
AWS WAF Geomatch:AWS Documentation - WAF Geomatch
問題 #164
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