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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Design Resilient Architectures | 26% | - Design highly available and fault-tolerant architectures
|
| Topic 2: Design Secure Architectures | 30% | - Design secure access to AWS resources
|
| Topic 3: Design High-Performing Architectures | 24% | - Design high-performance storage solutions
|
| Topic 4: Design Cost-Optimized Architectures | 20% | - Design cost-effective compute and network solutions
|
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質問 # 140
A company provides an API interface to customers so the customers can retrieve their financial information. The company expects a larger number of requests during peak usage times of the year. The company requires the API to respond consistently with low latency to ensure customer satisfaction. The company needs to provide a compute host for the API. Which solution will meet these requirements with the LEAST operational overhead?
正解：B
解説：
Provisioned concurrency is the key requirement match because AWS documentation states that it pre-initializes Lambda execution environments and is designed to reduce cold-start latency, supporting predictable response times in the double-digit millisecond range. That makes it ideal for APIs that must remain consistently low-latency during peak traffic periods. Reserved concurrency does not solve cold starts; it only reserves capacity. ECS and EKS could certainly host the API, but both introduce more infrastructure management than API Gateway plus Lambda. Since the question asks for theleast operational overheadwhile maintaining consistent low latency, the serverless pattern with API Gateway and Lambdawith provisioned concurrencyis the strongest AWS-native answer.
質問 # 141
[Design High-Performing Architectures]
A solutions architect is designing a highly available Amazon ElastiCache for Redis based solution. The solutions architect needs to ensure that failures do not result in performance degradation or loss of data locally and within an AWS Region. The solution needs to provide high availability at the node level and at the Region level.
Which solution will meet these requirements?
正解：A
解説：
This answer is correct because it provides high availability at the node level and at the Region level for the ElastiCache for Redis solution. A Multi-AZ Redis replication groupconsists of a primary cluster and up to five read replica clusters, each in a different Availability Zone. If the primary cluster fails, one of the read replicas is automatically promoted to be the new primary cluster. A Redis replication group with shards enables partitioning of the data across multiple nodes, which increases the scalability and performance of the solution. Each shard can have one or more replicas to provide redundancy and read scaling.
Reference:
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/AutoFailover.html
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Shards.html
質問 # 142
A company has deployed a multi-tier web application to support a website. The architecture includes an Application Load Balancer (ALB) in public subnets, two Amazon Elastic Container Service (Amazon ECS) tasks in the public subnets, and a PostgreSQL cluster that runs on Amazon EC2 instances in private subnets.
The EC2 instances that host the PostgreSQL database run shell scripts that need to access an external API to retrieve product information. A solutions architect must design a solution to allow the EC2 instances to securely communicate with the external API without increasing operational overhead.
Which solution will meet these requirements?
正解：D
解説：
EC2 instances in private subnets cannot access the internet unless there is a NAT gateway or a NAT instance configured.
"To enable instances in a private subnet to connect to the internet or other AWS services, you can use a NAT gateway or NAT instance."
- NAT Gateways - Amazon VPC
In this use case:
* EC2 instances are in private subnets
* They need to call external APIs (internet access)
* The most operationally efficient and secure method is to place a NAT Gateway in a public subnet and update the route table for private subnets to route internet-bound traffic through it.
Incorrect Options:
* A: Private subnets don't support public IPs.
* C: VPC peering doesn't help reach the public internet.
* D: Interface endpoints are for private connectivity to AWS services, not external APIs.
References:
NAT Gateway Documentation
VPC Best Practices
質問 # 143
A solutions architect is designing a two-tiered architecture that includes a public subnet and a database subnet.
The web servers in the public subnet must be open to the internet on port 443. The Amazon RDS for MySQL D6 instance in the database subnet must be accessible only to the web servers on port 3306.
Which combination of steps should the solutions architect take to meet these requirements? (Select TWO.)
正解：B、E
解説：
Explanation
Security groups are virtual firewalls that protect AWS instances and can be applied to EC2, ELB and RDS1
. Security groups have rules for inbound and outbound traffic and are stateful, meaning that responses to allowed inbound traffic are allowed to flow out of the instance2. Network ACLs are different from security groups in several ways. They cover entire subnets, not individual instances, and are stateless, meaning that they require rules for both inbound and outbound traffic2. Network ACLs also support deny rules, while security groups only support allow rules2.
To meet the requirements of the scenario, the solutions architect should create two security groups: one for the DB instance and one for the web servers in the public subnet. The security group for the DB instance should allow traffic from the public subnet CIDR block on port 3306, which is the default port for MySQL3. This way, only the web servers in the public subnet can access the DB instance on that port. The security group for the web servers should allow traffic from 0 0 0 O'O on port 443, which is the default port for HTTPS4. This way, the web servers can accept secure connections from the internet on that port.
質問 # 144
A data analytics company wants to migrate its batch processing system to AWS. The company receives thousands of small data files periodically during the day through FTP. A on-premises batch job processes the data files overnight. However, the batch job takes hours to finish running.
The company wants the AWS solution to process incoming data files are possible with minimal changes to the FTP clients that send the files. The solution must delete the incoming data files the files have been processed successfully. Processing for each file needs to take 3-8 minutes.
Which solution will meet these requirements in the MOST operationally efficient way?
正解：B
解説：
Explanation
This option is the most operationally efficient because it uses AWS Transfer Family to create an FTP server that can store incoming files in Amazon S3 Standard12, which is a low-cost and highly available storage service. It also uses AWS Lambda to process the files and delete them after they are processed, which is a serverless and scalable solution that does not require any batch scheduling or infrastructure management. It also uses S3 event notifications to invoke the Lambda function when the files arrive, which enables near real-time processing of the incoming data files3. Option A is less efficient because it uses Amazon S3 Glacier Flexible Retrieval, which is a cold storage class that has higher retrieval costs and longer retrieval times than Amazon S3 Standard. It also uses EventBridge rules to invoke the job nightly, which does not meet the requirement of processing incoming data files as soon as possible. Option B is less efficient because it uses an EBS volume to store incoming files, which is a block storage service that has higher costs and lower durability than Amazon S3. It also uses EventBridge rules to invoke the job nightly, which does not meet the requirement of processing incoming data files as soon as possible. Option C is less efficient because it uses an EBS volume to store incoming files, which is a block storage service that has higher costs and lower durability than Amazon S3. It also uses AWS Batch to process the files, which requires managing compute resources and job queues.
質問 # 145
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