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問題 #290
A finance company stores confidential data in an Amazon S3 bucket. The company uses Amazon QuickSight to analyze the data and create dashboard reports. The company requires that all data access and connections to QuickSight remain within the company's VPC network boundary.
Which solution will meet these requirements?
答案：A
解題說明：
To keep all QuickSight traffic and data access within the VPC boundary, you must use an interface VPC endpoint for QuickSight via AWS PrivateLink. This provides a private connection from your VPC to the QuickSight service without traversing the public internet. Then QuickSight can read data from S3 (referenced via a manifest file) while staying within the VPC path, as long as the proper S3 permissions are granted.
問題 #291
A global company runs a critical primary workload in the us-east-1 Region. The company wants to ensure business continuity with minimal downtime in case of a workload failure. The company wants to replicate the workload to a second AWS Region.
A CloudOps engineer needs a solution that achieves a recovery time objective (RTO) of less than
10 minutes and a zero recovery point objective (RPO) to meet service level agreements.
Which solution will meet these requirements?
答案：B
解題說明：
The active-active multi-Region architecture provides the lowest possible RTO and RPO among all disaster recovery strategies. In this approach, workloads are deployed and actively running in multiple AWS Regions simultaneously. All data is continuously replicated in real time between Regions using fully managed replication services, ensuring zero data loss (zero RPO).
Because both Regions are active and capable of handling requests, failover between them is instantaneous, meeting the RTO of less than 10 minutes. Amazon Route 53 is used with weighted or latency-based routing policies and health checks to automatically route traffic away from an impaired Region to the healthy Region without manual intervention.
Pilot Light Architecture maintains only a minimal copy of the environment in the secondary Region. It requires time to scale up infrastructure during a disaster, resulting in longer RTO and potential data loss (non-zero RPO).
Warm Standby Architecture keeps partially running infrastructure in the secondary Region.
Although faster than pilot light, it still requires scaling and synchronization, resulting in higher RTO and RPO compared to active-active.
Backup and Restore (option D) relies on periodic backups and restores data when needed. This approach has the highest RTO and RPO, unsuitable for mission-critical workloads demanding high availability and zero data loss.
Therefore, based on AWS-recommended disaster recovery strategies outlined in the AWS Cloud Operations and Disaster Recovery Guide, the Active-Active Multi-Region architecture (Option C) is the only approach that guarantees RTO <10 minutes and RPO = 0, achieving continuous availability and business continuity across Regions.
問題 #292
A company uses an organization in AWS Organizations to manage multiple AWS accounts. The company needs to send specific events from all the accounts in the organization to a new receiver account, where an AWS Lambda function will process the events.
A CloudOps engineer configures Amazon EventBridge to route events to a target event bus in the us-west-
2 Region in the receiver account. The CloudOps engineer creates rules in both the sender and receiver accounts that match the specified events. The rules do not specify an account parameter in the event pattern.
IAM roles are created in the sender accounts to allow PutEvents actions on the target event bus.
However, the first test events from the us-east-1 Region are not processed by the Lambda function in the receiving account.
What is the likely reason the events are not processed?
答案：C
解題說明：
Per the AWS Cloud Operations and EventBridge documentation, when events are sent across AWS accounts - particularly from multiple accounts in an AWS Organization - the target event bus in the receiver account must include a resource-based policy that explicitly allows events:PutEvents API calls from the sender accounts or the organization ID.
Even if the sender accounts have IAM permissions to call PutEvents, the receiving event bus must trust those accounts via a resource policy. Without this configuration, EventBridge automatically rejects incoming cross-account events, and those events never reach the target Lambda function for processing.
AWS guidance states that "Cross-account event delivery requires a resource-based policy on the event bus that grants permissions to the source accounts or organization." The policy can include either individual AWS account IDs or the organization's root ID.
In this scenario, because the events originate from multiple accounts and there is no resource policy on the target event bus to authorize those sender accounts, the events are not delivered.
Therefore, the correct cause is C - the resource-based policy on the target event bus must be modified to allow PutEvents API calls from the sender accounts.
Reference: AWS Cloud Operations - EventBridge Cross-Account Event Delivery Section, Permissions for Event Bus Targets and Organizational Event Routing
問題 #293
A company is migrating a legacy application to AWS. The application runs on EC2 instances across multiple Availability Zones behind an Application Load Balancer (ALB). The target group routing algorithm is set to weighted random, and the application requires session affinity (sticky sessions).
After deployment, users report random application errors that were not present before migration, even though target health checks are passing.
Which solution will meet this requirement?
答案：D
解題說明：
According to the AWS Cloud Operations and Elastic Load Balancing documentation, Application Load Balancer (ALB) supports multiple routing algorithms to distribute requests among targets:
* Round robin (default)
* Least outstanding requests (LOR)
* Weighted random
When applications require session affinity, AWS recommends using "least outstanding requests" as the load balancing algorithm because it reduces latency, distributes load evenly, and ensures consistent target responsiveness during high traffic.
Using weighted random routing with sticky sessions can cause sessions to be routed inconsistently if one target's capacity fluctuates, leading to session mismatches and application errors - especially when user sessions rely on instance-specific state.
Disabling cross-zone balancing (Option C) or adjusting deregistration delay (Option D) does not address routing inconsistency. Anomaly mitigation (Option B) protects against target performance degradation, not sticky-session misrouting.
Therefore, the correct solution is Option A - changing the target group's routing algorithm to least outstanding requests ensures smoother, predictable session handling and resolves random application errors.
Reference: AWS Cloud Operations & Load Balancing Guide - Optimizing Application Load Balancer Routing Algorithms for Stateful Applications
問題 #294
A company is building a web application on AWS. The company is using Amazon CloudFront with a domain name of www.example.com. All traffic to CloudFront must be encrypted in transit. The company already has provisioned an SSL certificate for www.example.com in AWS Certificate Manager (ACM). Which combination of steps should a CloudOps engineer take to encrypt the traffic in transit? (Choose two.)
答案：A,B
解題說明：
Configuring the Viewer Protocol Policy to redirect HTTP requests to HTTPS ensures that viewers use encrypted connections to CloudFront. Adding www.example.com as an alternate domain name and associating the existing ACM certificate enables CloudFront to present the correct SSL/TLS certificate for that custom domain.
問題 #295
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