AWS Certified Solutions Architect - Professional (SAP-C02) Practice Tests

Explanation

The AWS Organizations invitation-based approach is correct because it automates the creation of a service-linked role (typically `OrganizationAccountAccessRole`) in member accounts when they join. This role, by default, trusts the management account and has `AdministratorAccess`, providing immediate administrative control with minimal setup effort. This is the standard and least-effort way to establish this control. The manual cross-account IAM role creation approach is incorrect because AWS Organizations automates this process, eliminating the need for manual role creation in each member account. The reversed invitation flow approach is incorrect because it misrepresents how the invitation process works and also incorrectly suggests manual role creation is required. The AWS Control Tower approach, while valid, represents a more extensive landing zone solution that requires more effort than the basic AWS Organizations setup needed for administrative control.

Explanation

The necessary steps involve creating separate route tables and dividing the VPC-Beta subnet to resolve the routing conflict caused by overlapping CIDR blocks in peered VPCs. Here's why: - The core problem: VPC-Alpha and VPC-Gamma both use 10.1.0.0/16. When an instance in VPC-Beta tries to reach an IP in 10.1.0.0/16, a single route table can only have one entry for that destination CIDR. This is why both B1 and B2 are currently routed to the same peered VPC (VPC-Alpha, assuming its peering route was prioritized or entered first). - Creating two separate route tables is essential. To route traffic to different peered VPCs that have the same CIDR, you need different routing policies. You'll create one route table (RT-Alpha) that routes 10.1.0.0/16 to the peering connection for VPC-Alpha. You'll create another route table (RT-Gamma) that routes 10.1.0.0/16 to the peering connection for VPC-Gamma. - Creating two new, smaller subnets and moving instances is the complementary step. Once you have two different route tables, you need to associate them with different subnets within VPC-Beta. Server-B1 will be placed in a new subnet (e.g., Subnet-B1: 192.168.2.0/28) which is then associated with RT-Alpha. Server-B2 will be placed in another new subnet (e.g., Subnet-B2: 192.168.2.16/28) which is associated with RT-Gamma. The CIDRs 192.168.2.0/28 (hosts .1 to .14) and 192.168.2.16/28 (hosts .17 to .30) are distinct and can accommodate the instances. Why other approaches are incorrect: - Modifying a single route table to include multiple entries for the same destination: A single route table cannot have two routes for the exact same destination CIDR (10.1.0.0/16). It will only use one of them, leading to the current problem. - Using /29 subnets: The subnet sizes /29 provide only 6 usable IP addresses (8 total minus network, broadcast, and 3 AWS reserved). While technically Server-B1 (192.168.2.10) and Server-B2 (192.168.2.20) could fit if the subnets were defined as, say, 192.168.2.8/29 and 192.168.2.16/29 respectively, the /28 approach provides slightly more room and is a common valid setup. The key is separating them into subnets linked to different route tables. - Using /27 subnets: A /27 subnet has 32 IP addresses. 192.168.2.0/27 and 192.168.2.32/27 are valid non-overlapping subnets. This could also work in conjunction with separate route tables. However, the /28 subnetting is also a valid choice. The crucial part is creating separate subnets and associating them with distinct route tables.

Explanation

These two features are specifically designed to accelerate S3 content delivery and transfers over long distances. Amazon CloudFront is a Content Delivery Network (CDN). For downloads, it caches copies of the files at edge locations around the world, physically closer to the users, which dramatically reduces latency. For uploads, CloudFront can also be used to accelerate POST/PUT requests by terminating the connection at a nearby edge location and then routing the traffic over the optimized AWS global network to the origin S3 bucket. S3 Transfer Acceleration is another feature that uses the AWS global edge network to speed up long-distance transfers to and from S3. When a user uploads a file using the special Transfer Acceleration endpoint, the data is routed to the nearest edge location and then travels over the high-speed AWS backbone network to the S3 bucket, bypassing potential congestion on the public internet. Creating separate S3 buckets in each region would violate the requirement to maintain a centralized storage repository and would complicate data management. Deploying EC2 instances in each region to act as a local cache and migrating to Amazon EFS with VPC peering both introduce servers (EC2 instances) and complex network setups, which violates the requirement to maintain a serverless solution.

Explanation

This is the modern, recommended best practice for integrating Active Directory with AWS Organizations. The AWS IAM Identity Center solution is correct because it serves as the central service for managing access across an AWS Organization. IAM Identity Center can be configured to federate with an external identity provider like on-premises Active Directory using the SAML 2.0 standard. This allows users to sign in with their existing credentials. Using the System for Cross-domain Identity Management (SCIM) protocol automates the provisioning and de-provisioning of users and groups from Active Directory into IAM Identity Center. Finally, using attribute-based access control (ABAC) allows for fine-grained permissions based on user attributes (like department or cost center) from Active Directory, meeting the conditional access requirement. The built-in IAM Identity Center directory approach is incorrect because it uses the internal IAM Identity Center directory, not the on-premises Active Directory as the source of truth, which violates a primary requirement. The SAML 2.0 identity provider with manual IAM user provisioning and the OpenID Connect (OIDC) identity provider with cross-account IAM roles are both incorrect because these are older, more complex methods of setting up federation on a per-account basis. They require more manual configuration (provisioning roles/users in each account) and do not provide the centralized management and simplicity that IAM Identity Center offers when used with AWS Organizations.

Explanation

AWS PrivateLink is designed specifically for this secure, private connectivity use case. The AWS PrivateLink solution is correct: AWS PrivateLink allows you to connect to services hosted by other AWS accounts as if they were running inside your own VPC. The hospital (the service consumer) creates an interface VPC endpoint, which gets a private IP address within its VPC. Traffic sent to this endpoint is securely routed to the EHR provider's service over the AWS private network, completely avoiding the internet. Using a security group on the endpoint provides granular, stateful traffic control. Why VPC peering is incorrect: VPC peering creates a full network connection between two VPCs. This is often too permissive, as it can expose entire subnets to each other and requires careful management of routing and CIDR block overlaps. PrivateLink provides a more secure, one-way connection to a specific service only. Why Site-to-Site VPN is incorrect: A Site-to-Site VPN is typically used to connect an on-premises data center to AWS or to connect VPCs over the internet (though it can be used over Direct Connect). It adds complexity and is not the native, most direct way to privately connect to a service within AWS. Why creating an endpoint service in the hospital's VPC is incorrect: This reverses the roles. The service provider (the EHR company) creates the endpoint service. The service consumer (the hospital) creates the interface endpoint to connect to that service. The hospital would not create an endpoint service.