ANS-C01 Exam Dumps : Amazon AWS Certified Advanced Networking - Specialty

Source IP Addresses in Dropped Traffic: When traffic is dropped by the transit gateway, the source IP addresses are the origin of the traffic causing the issue. To block this traffic from entering the VPC, an inbound rule must be added to the network ACL for the transit gateway attachment subnets.

Inbound Rule on Network ACL: Network ACLs (NACLs) are stateless and require explicit rules to allow or deny traffic. Adding aninbound ruleto deny traffic from the source IP addresses effectively prevents the unwanted traffic from entering the VPC.

Notification Details: The existing Lambda function should include the source IP addresses in the SNS notification so that the new Lambda function can use this information to automatically update the NACL.

To use AWS PrivateLink, you need to create interface type VPC endpoints for the services that you want to access privately from your VPC1. These endpoints appear as elastic network interfaces (ENIs) with private IPs in your subnets2. To enable DNS resolution for these endpoints, you need to set the enableDnsSupport attribute to True for your VPC, and enable DNS support for each endpoint3. You also need to ensure that the VPC endpoint policy allows communication between your VPC and the service4. You do not need to create any route table entries or Route 53 hosted zones for the endpoints, as they are not required for PrivateLink5.

AWS PrivateLink FAQs – Amazon Web Services 2: AWS PrivateLink and service endpoint - Amazon EC2 Overview and Networking Introduction for Telecom Companies 3: VPC Endpoints: Secure and Direct Access to AWS Services 4: AWS PrivateLink and service endpoint - Amazon EC2 Overview and Networking Introduction for Telecom Companies 5: AWS Private Link vs VPC Endpoint - Stack Overflow