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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Design Secure Architectures | 30% | - Secure access to AWS resources
|
| Topic 2: Design Resilient Architectures | 26% | - Fault tolerance and recovery
|
| Topic 3: Design High-Performing Architectures | 24% | - Performance scaling
|
| Topic 4: Design Cost-Optimized Architectures | 20% | - Cost-effective resource selection
|
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NEW QUESTION # 911
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?
Answer: D
Explanation:
Spot blocks are not longer available, and you can't use spot instances on Prod machines 24x7.
NEW QUESTION # 912
A solutions architect is designing a web application that will run on Amazon EC2 instances behind an Application Load Balancer (ALB). The company strictly requires that the application be resilient against malicious internet activity and attacks, and protect against new common vulnerabilities and exposures. What should the solutions architect recommend?
Answer: D
Explanation:
AWS WAF allows web applications to protect themselves from common web exploits and vulnerabilities. Using AWS managed rule groups ensures protection against known attack patterns, such as SQL injection and cross-site scripting. Associating AWS WAF with the ALB provides application-layer security and real-time threat mitigation.
NEW QUESTION # 913
A company runs a web application on Amazon EC2 instances in an Auto Scaling group that has a target group. The company designed the application to work with session affinity (sticky sessions) for a better user experience.
The application must be available publicly over the internet as an endpoint. A WAF must be applied to the endpoint for additional security. Session affinity (sticky sessions) must be configured on the endpoint.
Answer: C,E
Explanation:
The Application Load Balancer (ALB) supports sticky sessions (session affinity) using application cookies.
AWS WAF integrates natively with ALB to provide Layer 7 protection at the same endpoint.
From AWS Documentation:
"You can enable sticky sessions for your Application Load Balancer target groups to ensure that a user's requests are consistently routed to the same target. AWS WAF integrates with Application Load Balancer to protect your web applications from common exploits." (Source: Elastic Load Balancing User Guide & AWS WAF Developer Guide) Why C and E are correct:
* C: ALB operates at Layer 7 (HTTP/HTTPS), supports sticky sessions, and can serve as a public endpoint.
* E: AWS WAF can be directly associated with the ALB to inspect traffic and enforce rules.Together, they fulfill both the security and session affinity requirements.
Why others are incorrect:
* A: Network Load Balancer doesn't support session affinity.
* B: Gateway Load Balancer is used for virtual appliances, not web applications.
* D: Using EIPs bypasses load balancing and WAF integration.
References:
Elastic Load Balancing User Guide - "Sticky Sessions for Application Load Balancers" AWS WAF Developer Guide - "Associating a Web ACL with an ALB" AWS Well-Architected Framework - Security and Performance Pillars
NEW QUESTION # 914
A retail company uses a regional Amazon API Gateway API for its public REST APIs. The API Gateway endpoint is a custom domain name that points to an Amazon Route 53 alias record. A solutions architect needs to create a solution that has minimal effects on customers and minimal data loss to release the new version of APIs.
Which solution will meet these requirements?
Answer: B
Explanation:
This answer is correct because it meets the requirements of releasing the new version of APIs with minimal effects on customers and minimal data loss. A canary release deployment is a software development strategy in which a new version of an API is deployed for testing purposes, and the base version remains deployed as a production release for normal operations on the same stage. In a canary release deployment, total API traffic is separated at random into a production release and a canary release with a pre-configured ratio. Typically, the canary release receives a small percentage of API traffic and the production release takes up the rest. The updated API features are only visible to API traffic through the canary. You can adjust the canary traffic percentage to optimize test coverage or performance. By keeping canary traffic small and the selection random, most users are not adversely affected at any time by potential bugs in the new version, and no single user is adversely affected all the time. After the test metrics pass your requirements, you can promote the canary release to the production release and disable the canary from the deployment. This makes the new features available in the production stage.
Reference:
https://docs.aws.amazon.com/apigateway/latest/developerguide/canary-release.html
NEW QUESTION # 915
A solutions architect is deploying a company's application to Amazon EC2 instances. The application generates gigabytes of data files each day. The files are rarely accessed, but the files must be available to the application's users within minutes of a request during the first year of storage. The company must retain the files for 7 years. How can the solutions architect implement the application to meet these requirements MOST cost-effectively?
Answer: B
Explanation:
The files are rarely accessed but must be retrievable within minutes for the first year, and retained for 7 years total. Storing them in Amazon S3 Glacier Instant Retrieval during the first year gives low-cost storage with millisecond retrieval, easily meeting the "within minutes" requirement. After
1 year, the requirement for fast access no longer applies, so an S3 Lifecycle policy can transition the objects to S3 Glacier Deep Archive, which is much cheaper for long-term retention. This combination meets performance and retention needs with the lowest overall storage cost among the options.
NEW QUESTION # 916
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