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Amazon ANS-C01 Exam (page: 9)
Amazon AWS Certified Advanced Networking - Specialty ANS-C01
Updated on: 25-Dec-2025

Viewing Page 9 of 45
ANS-C01 PDF 274 Questions

A company is creating new features for its ecommerce website. These features will use several microservices that are accessed through different paths. The microservices will run on Amazon Elastic Container Service (Amazon ECS). The company requires the use of HTTPS for all of its public websites. The application requires the customer’s source IP addresses.
A network engineer must implement a load balancing strategy that meets these requirements.
Which combination of actions should the network engineer take to accomplish this goal? (Choose two.)

  1. Use a Network Load Balancer
  2. Retrieve client IP addresses by using the X-Forwarded-For header
  3. Use AWS App Mesh load balancing
  4. Retrieve client IP addresses by using the X-IP-Source header
  5. Use an Application Load Balancer.

Answer(s): B,E



A company is migrating its containerized application to AWS. For the architecture the company will have an ingress VPC with a Network Load Balancer (NLB) to distribute the traffic to front-end pods in an Amazon Elastic Kubernetes Service (Amazon EKS) cluster. The front end of the application will determine which user is requesting access and will send traffic to 1 of 10 services VPCs. Each services VPC will include an NLB that distributes traffic to the services pods in an EKS cluster.
The company is concerned about overall cost. User traffic will be responsible for more than 10 TB of data transfer from the ingress VPC to services VPCs every month. A network engineer needs to recommend how to design the communication between the VPCs.
Which solution will meet these requirements at the LOWEST cost?

  1. Create a transit gateway. Peer each VPC to the transit gateway. Use zonal DNS names for the NLB in the services VPCs to minimize cross-AZ traffic from the ingress VPC to the services VPCs.
  2. Create an AWS PrivateLink endpoint in every Availability Zone in the ingress VPC. Each PrivateLink endpoint will point to the zonal DNS entry of the NLB in the services VPCs.
  3. Create a VPC peering connection between the ingress VPC and each of the 10 services VPCs. Use zonal DNS names for the NLB in the services VPCs to minimize cross-AZ traffic from the ingress VPC to the services VPCs.
  4. Create a transit gateway. Peer each VPC to the transit gateway. Turn off cross-AZ load balancing on the transit gateway. Use Regional DNS names for the NLB in the services VPCs.

Answer(s): C



A company has stateful security appliances that are deployed to multiple Availability Zones in a centralized shared services VPC. The AWS environment includes a transit gateway that is attached to application VPCs and the shared services VPC. The application VPCs have workloads that are deployed in private subnets across multiple Availability Zones. The stateful appliances in the shared services VPC inspect all east west (VPC-to-VPC) traffic.

Users report that inter-VPC traffic to different Availability Zones is dropping. A network engineer verified this claim by issuing Internet Control Message Protocol (ICMP) pings between workloads in different Availability Zones across the application VPCs. The network engineer has ruled out security groups, stateful device configurations and network ACLs as the cause of the dropped traffic.
What is causing the traffic to drop?

  1. The stateful appliances and the transit gateway attachments are deployed in a separate subnet in the shared services VPC.
  2. Appliance mode is not enabled on the transit gateway attachment to the shared services VPC.
  3. The stateful appliances and the transit gateway attachments are deployed in the same subnet in the shared services VP
  4. Appliance mode is not enabled on the transit gateway attachment to the application VPCs.

Answer(s): B


Reference:

https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-appliance-scenario.html



A company has hundreds of Amazon EC2 instances that are running in two production VPCs across all Availability Zones in the us-east-1 Region. The production VPCs are named
VPC A and VPC B.
A new security regulation requires all traffic between production VPCs to be inspected before the traffic is routed to its final destination. The company deploys a new shared VPC that contains a stateful firewall appliance and a transit gateway with a VPC attachment across all VPCs to route traffic between VPC A and VPC B through the firewall appliance for inspection. During testing, the company notices that the transit gateway is dropping the traffic whenever the traffic is between two Availability Zones.
What should a network engineer do to fix this issue with the LEAST management overhead?

  1. In the shared VPC, replace the VPC attachment with a VPN attachment. Create a VPN tunnel between the transit gateway and the firewall appliance. Configure BGP.
  2. Enable transit gateway appliance mode on the VPC attachment in VPC A and VPC
  3. Enable transit gateway appliance mode on the VPC attachment in the shared VP
  4. In the shared VPC, configure one VPC peering connection to VPC A and another VPC peering connection to VPC B.

Answer(s): C

Explanation:

Transit gateway appliance mode allows traffic to be routed between VPCs in different Availability Zones without having to create a VPN tunnel between the transit gateway and the firewall appliance. This can be done by enabling appliance mode on the VPC attachment in the shared VPC.



A company has deployed a critical application on a fleet of Amazon EC2 instances behind an Application Load Balancer. The application must always be reachable on port 443 from the public internet. The application recently had an outage that resulted from an incorrect change to the EC2 security group.
A network engineer needs to automate a way to verify the network connectivity between the public internet and the EC2 instances whenever a change is made to the security group. The solution also must notify the network engineer when the change affects the connection.
Which solution will meet these requirements?

  1. Enable VPC Flow Logs on the elastic network interface of each EC2 instance to capture REJECT traffic on port 443. Publish the flow log records to a log group in Amazon CloudWatch Logs. Create a CloudWatch Logs metric filter for the log group for rejected traffic. Create an alarm to notify the network engineer.
  2. Enable VPC Flow Logs on the elastic network interface of each EC2 instance to capture all traffic on port 443. Publish the flow log records to a log group in Amazon CloudWatch Logs. Create a CloudWatch Logs metric filter for the log group for all traffic. Create an alarm to notify the network engineer
  3. Create a VPC Reachability Analyzer path on port 443. Specify the security group as the source. Specify the EC2 instances as the destination. Create an Amazon Simple Notification Service (Amazon SNS) topic to notify the network engineer when a change to the security group affects the connection. Create an AWS Lambda function to start Reachability Analyzer and to publish a message to the SNS topic in case the analyses fail Create an Amazon EventBridge (Amazon CloudWatch Events) rule to invoke the Lambda function when a change to the security group occurs.
  4. Create a VPC Reachability Analyzer path on port 443. Specify the internet gateway of the VPC as the source. Specify the EC2 instances as the destination. Create an Amazon Simple Notification Service (Amazon SNS) topic to notify the network engineer when a change to the security group affects the connection. Create an AWS Lambda function to start Reachability Analyzer and to publish a message to the SNS topic in case the analyses fail. Create an Amazon EventBridge (Amazon CloudWatch Events) rule to invoke the Lambda function when a change to the security group occurs.

Answer(s): D



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