ANS-C01 Practice Exam — ANS-C01：Advanced Networking Specialty

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Exam information

Advanced Networking - Specialty Exam Code: ANS-C01

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·Exam Languages: Simplified Chinese, English, Japanese, etc. Certificates issued in different languages carry equal recognition. You may take the exam in Chinese and still download an English‑language certificate.

·Exam Location: Offline Pearson VUE test centers in designated cities, or online proctored exam on your personal computer (webcam monitoring throughout the exam; cheating is strictly prohibited).

·Exam Environment: For online exams, a plain background and noise‑free surroundings are required. A company meeting room is recommended if available, with a backup internet connection (VPN is not mandatory).

·Exam Format: 65 multiple‑choice questions. Total score is 1000 points; a score of 720 or higher is required to pass.

·Exam Duration: 170 minutes. Score reports will be sent via email within one business day after completion.

Sample questions

ANS-C01 · Q1

Topic 1 Question #1 A company is planning to create a service that requires encryption in transit. The traffic must not be decrypted between the client and the backend of the service. The company will implement the service by using the gRPC protocol over TCP port 443. The service will scale up to thousands of simultaneous connections. The backend of the service will be hosted on an Amazon Elastic Kubernetes Service (Amazon EKS) duster with the Kubernetes Cluster Autoscaler and the Horizontal Pod Autoscaler configured. The company needs to use mutual TLS for two-way authentication between the client and the backend.Which solution will meet these requirements?

A.
Install the AWS Load Balancer Controller for Kubernetes. Using that controller, configure a Network Load Balancer with a TCP listener on port 443 to forward traffic to the IP addresses of the backend service Pods.
B.
Install the AWS Load Balancer Controller for Kubernetes. Using that controller, configure an Application Load Balancer with an HTTPS listener on port 443 to forward traffic to the IP addresses of the backend service Pods.
C.
Create a target group. Add the EKS managed node group's Auto Scaling group as a target Create an Application Load Balancer with an HTTPS listener on port 443 to forward traffic to the target group.
D.
Create a target group. Add the EKS managed node group’s Auto Scaling group as a target. Create a Network Load Balancer with a TLS listener on port 443 to forward traffic to the target group.

Answer: A

The scenario has four core requirements: 1) No decryption of traffic between the client and backend service, 2) Mutual TLS (mTLS) for two-way authentication directly between clients and backend workloads, 3) Support for gRPC over TCP port 443 with thousands of simultaneous concurrent connections, 4) Native compatibility with EKS Cluster Autoscaler and Horizontal Pod Autoscaler (HPA) workflows. To meet these requirements, the load balancing solution must avoid TLS termination (to prevent intermediate decryption and preserve end-to-end mTLS negotiation), operate at layer 4 to forward raw TCP traffic for gRPC, automatically update target membership as pods scale up or down, and support high connection volume efficiently. The correct approach uses a Network Load Balancer (NLB) with a TCP listener provisioned via the AWS Load Balancer Controller, which registers pod IPs directly as targets to align with Kubernetes orchestration and autoscaling configurations. Option Analysis: A. Correct. The AWS Load Balancer Controller natively integrates with EKS to provision and manage AWS load balancers. A TCP listener on NLB operates at layer 4, forwarding raw TCP traffic on port 443 without terminating TLS, so traffic remains encrypted between client and backend, preserving end-to-end mTLS functionality. The controller uses IP target mode to register individual pod IPs directly as NLB targets, automatically updating target membership as HPA scales pods up or down, eliminating manual target management. NLB is optimized for high volumes of concurrent connections, making it suitable for thousands of simultaneous connections, and supports unmodified gRPC traffic over TCP. B. Incorrect. An Application Load Balancer (ALB) with an HTTPS listener terminates TLS at the load balancer, which decrypts traffic before forwarding it to backends, violating the requirement that traffic is not decrypted between client and backend. TLS termination at ALB also breaks end-to-end mTLS, as mTLS negotiation would occur between the client and ALB instead of the client and backend pods. C. Incorrect. First, an ALB with an HTTPS listener terminates TLS at the load balancer, decrypting traffic and violating the no intermediate decryption requirement, as well as breaking end-to-end mTLS. Second, targeting the EKS managed node group Auto Scaling group registers nodes as targets instead of individual pods, requiring traffic to route via NodePorts, adding unnecessary network hops, and failing to automatically update targets when HPA scales pods, leading to inefficient routing and potential traffic loss. D. Incorrect. An NLB with a TLS listener terminates TLS at the load balancer, decrypting traffic and violating the no intermediate decryption requirement, as well as breaking end-to-end mTLS negotiation between clients and backend pods. Additionally, targeting the node group Auto Scaling group instead of individual pod IPs ties target registration to nodes rather than pods, so HPA scaling events do not automatically update target membership, leading to suboptimal routing and compatibility issues with EKS autoscaling configurations. Key Concepts: 1. Load Balancer TLS Handling: Layer 4 Network Load Balancers with TCP listeners forward traffic without TLS termination, preserving end-to-end encryption, while Application Load Balancers (layer 7) and NLBs with TLS listeners terminate TLS at the load balancer, decrypting traffic before forwarding. This is a critical distinction for use cases requiring end-to-end encryption and mTLS. 2. AWS Load Balancer Controller for EKS: This open-source controller manages AWS load balancers for EKS clusters, supporting IP target mode that registers individual pod IPs directly as load balancer targets. It automatically updates target membership as pods are created or deleted by Kubernetes orchestration, including scaling events from the Horizontal Pod Autoscaler. 3. Mutual TLS (mTLS) Requirements: mTLS requires unbroken TLS negotiation directly between the client and backend service to support two-way certificate authentication. Any intermediate system that terminates TLS breaks this flow, as it becomes the endpoint for TLS negotiation instead of the backend service. References: AWS Load Balancer Controller, https://docs.aws.amazon.com/eks/latest/userguide/aws-load-balancer-controller.html Network Load Balancer Listeners, https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-listeners.html

ANS-C01 · Q2

Topic 1 Question #2 A company is deploying a new application in the AWS Cloud. The company wants a highly available web server that will sit behind an Elastic Load Balancer. The load balancer will route requests to multiple target groups based on the URL in the request. All traffic must use HTTPS. TLS processing must be offloaded to the load balancer. The web server must know the user’s IP address so that the company can keep accurate logs for security purposes.Which solution will meet these requirements?

A.
Deploy an Application Load Balancer with an HTTPS listener. Use path-based routing rules to forward the traffic to the correct target group. Include the X-Forwarded-For request header with traffic to the targets.
B.
Deploy an Application Load Balancer with an HTTPS listener for each domain. Use host-based routing rules to forward the traffic to the correct target group for each domain. Include the X-Forwarded-For request header with traffic to the targets.
C.
Deploy a Network Load Balancer with a TLS listener. Use path-based routing rules to forward the traffic to the correct target group. Configure client IP address preservation for traffic to the targets.
D.
Deploy a Network Load Balancer with a TLS listener for each domain. Use host-based routing rules to forward the traffic to the correct target group for each domain. Configure client IP address preservation for traffic to the targets.

Answer: A

The scenario has four core requirements: routing to multiple target groups based on request URL, end-to-end HTTPS traffic, TLS processing offloaded to the load balancer, and backend web server visibility into original client IP addresses for security logging. Application Load Balancers (ALB) are the only AWS Elastic Load Balancing (ELB) offering that supports native Layer 7 path-based routing, which aligns with the URL-based routing requirement. Configuring an HTTPS listener on the ALB terminates TLS connections at the load balancer, eliminating the need for backend web servers to handle cryptographic TLS processing as required. ALBs automatically insert the X-Forwarded-For header into forwarded traffic, which carries the original client IP address, allowing web servers to log user IPs without direct client connectivity. This combination of features exactly meets all stated requirements, confirming option A as the valid solution. Option Analysis: A. Correct. ALB supports Layer 7 path-based routing to forward traffic to different target groups based on URL path, matching the core routing requirement. An HTTPS listener on the ALB terminates TLS at the load balancer to offload TLS processing from backend web servers. The X-Forwarded-For header included with forwarded traffic contains the original client IP address, enabling web servers to capture user IPs for security logs. All requirements are fully satisfied. B. Incorrect. The question specifies routing based on request URL, not the domain name in the Host header. Host-based routing is designed to route traffic for separate domains to different target groups, which does not align with the stated routing use case. Additionally, a single ALB HTTPS listener can support multiple domains via Server Name Indication (SNI), so separate listeners per domain are unnecessary and not required for the scenario. C. Incorrect. Network Load Balancers (NLB) operate at Layer 4 of the OSI model and do not support path-based routing, which is a Layer 7 feature exclusive to ALB. The core requirement to route traffic based on URL path cannot be met with an NLB, making this option invalid regardless of other included features. D. Incorrect. NLB does not support host-based routing or any Layer 7 routing functionality, as it is purpose-built for Layer 4 traffic handling. The requirement for URL-based routing cannot be fulfilled with an NLB, and host-based routing would not address the use case even if it were supported. This option fails to meet the core routing requirement. Key Concepts: 1. Elastic Load Balancer Feature Differentiation: ALB operates at Layer 7, supporting path/host-based routing, TLS termination, and X-Forwarded header insertion for client visibility. NLB operates at Layer 4, delivering high throughput, static IP support, and client IP preservation, but lacks Layer 7 routing capabilities. This is a core ANS-C01 domain topic covering ELB use case alignment. 2. X-Forwarded-For Header: This standard header is inserted by Layer 7 load balancers when terminating client connections. It contains the original public IP address of the requesting client, allowing backend targets that do not have a direct connection to the client to capture and log requester IPs for auditing and security purposes. 3. ALB Routing Rule Types: Path-based routing forwards requests to target groups based on the URL path component (e.g. /api, /static), while host-based routing forwards based on the Host header domain value. Selecting the appropriate routing type for a given workload is a common ANS-C01 exam objective. References: What is an Application Load Balancer?, https://docs.aws.amazon.com/elasticloadbalancing/latest/application/introduction.html X-Forwarded Headers for Application Load Balancers, https://docs.aws.amazon.com/elasticloadbalancing/latest/application/x-forwarded-headers.html

ANS-C01 · Q3

Topic 1 Question #3 A company has developed an application on AWS that will track inventory levels of vending machines and initiate the restocking process automatically. The company plans to integrate this application with vending machines and deploy the vending machines in several markets around the world. The application resides in a VPC in the us-east-1 Region. The application consists of an Amazon Elastic Container Service (Amazon ECS) cluster behind an Application Load Balancer (ALB). The communication from the vending machines to the application happens over HTTPS.The company is planning to use an AWS Global Accelerator accelerator and configure static IP addresses of the accelerator in the vending machines for application endpoint access. The application must be accessible only through the accelerator and not through a direct connection over the internet to the ALB endpoint.Which solution will meet these requirements?

A.
Configure the ALB in a private subnet of the VPC. Attach an internet gateway without adding routes in the subnet route tables to point to the internet gateway. Configure the accelerator with endpoint groups that include the ALB endpoint. Configure the ALB’s security group to only allow inbound traffic from the internet on the ALB listener port.
B.
Configure the ALB in a private subnet of the VPC. Configure the accelerator with endpoint groups that include the ALB endpoint. Configure the ALB's security group to only allow inbound traffic from the internet on the ALB listener port.
C.
Configure the ALB in a public subnet of the VPAttach an internet gateway. Add routes in the subnet route tables to point to the internet gateway. Configure the accelerator with endpoint groups that include the ALB endpoint. Configure the ALB's security group to only allow inbound traffic from the accelerator's IP addresses on the ALB listener port.
D.
Configure the ALB in a private subnet of the VPC. Attach an internet gateway. Add routes in the subnet route tables to point to the internet gateway. Configure the accelerator with endpoint groups that include the ALB endpoint. Configure the ALB's security group to only allow inbound traffic from the accelerator's IP addresses on the ALB listener port.

Answer: A

This question tests knowledge of AWS Global Accelerator integration with internal Application Load Balancers (ALBs) and network access control to prevent direct public internet exposure of application endpoints. The core requirements are that the ALB cannot be accessed directly from the internet, and only traffic routed through AWS Global Accelerator can reach the application. Placing the ALB in a private subnet ensures it only has a private IP address, eliminating any public endpoint for direct internet access. AWS Global Accelerator requires the VPC hosting the internal ALB to have an internet gateway attached to enable routing over the AWS global private network, even if the private subnets do not have routes pointing to the internet gateway, as traffic never traverses the public internet between the accelerator and the ALB. The ALB security group rule allowing inbound traffic on the listener port permits traffic forwarded from Global Accelerator to reach the ALB, with no risk of public access since the ALB has no public IP. This configuration fully meets all stated requirements. Option Analysis: A. Correct. The ALB is deployed in a private subnet, so it has no public IP address and cannot be accessed directly from the internet, satisfying the no direct access requirement. Attaching an internet gateway to the VPC meets the mandatory prerequisite for Global Accelerator to communicate with VPC resources, while omitting internet gateway routes from the private subnet route tables ensures no public routing is enabled for the ALB's subnets. The security group rule allowing inbound traffic on the ALB listener port accepts traffic forwarded from Global Accelerator, which travels over the private AWS network, so no additional IP filtering is required to block public access. B. Incorrect. A VPC must have an internet gateway attached to use AWS Global Accelerator with VPC resources, including internal ALBs. Without an attached internet gateway, Global Accelerator cannot route traffic to the internal ALB, so vending machines would be unable to reach the application. C. Incorrect. Deploying the ALB in a public subnet assigns it a public IP address, creating a public endpoint that could be targeted for direct internet access, even if security group rules restrict access. This violates the requirement that the application must not be accessible through a direct internet connection to the ALB endpoint. D. Incorrect. Adding routes to the internet gateway in the private subnet route tables is unnecessary for Global Accelerator traffic, which travels over the private AWS network and does not require public routing for the ALB's subnets. While the ALB remains internal, this configuration introduces unnecessary routing configuration and potential risk of misconfiguration leading to public exposure, and is not the optimal solution. Key Concepts: 1. AWS Global Accelerator Internal ALB Endpoint Requirements: To use an internal Application Load Balancer as a Global Accelerator endpoint, the VPC must have an internet gateway attached, but the subnets hosting the internal ALB do not need public IP addresses or routes to the internet gateway, as traffic traverses the AWS private backbone network. 2. Internal Application Load Balancer Isolation: Internal ALBs are assigned only private IP addresses from their host subnets, and are not reachable from the public internet by default, making them suitable for workloads that require restricting access to only private or AWS-routed traffic. 3. VPC Internet Gateway Prerequisites for Global Accelerator: An internet gateway attached to the VPC is required for Global Accelerator to establish network connectivity to VPC resources, regardless of whether the resources are in public or private subnets, as it enables the AWS network to route traffic between the Global Accelerator edge network and the VPC. References: AWS Global Accelerator Endpoints, https://docs.aws.amazon.com/global-accelerator/latest/dg/endpoints.html Internal Application Load Balancers, https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-internal.html

ANS-C01 · Q4

Topic 1 Question #4 A global delivery company is modernizing its fleet management system. The company has several business units. Each business unit designs and maintains applications that are hosted in its own AWS account in separate application VPCs in the same AWS Region. Each business unit's applications are designed to get data from a central shared services VPC.The company wants the network connectivity architecture to provide granular security controls. The architecture also must be able to scale as more business units consume data from the central shared services VPC in the future.Which solution will meet these requirements in the MOST secure manner?

A.
Create a central transit gateway. Create a VPC attachment to each application VPC. Provide full mesh connectivity between all the VPCs by using the transit gateway.
B.
Create VPC peering connections between the central shared services VPC and each application VPC in each business unit's AWS account.
C.
Create VPC endpoint services powered by AWS PrivateLink in the central shared services VPCreate VPC endpoints in each application VPC.
D.
Create a central transit VPC with a VPN appliance from AWS Marketplace. Create a VPN attachment from each VPC to the transit VPC. Provide full mesh connectivity among all the VPCs.

Answer: C

The scenario requires two core capabilities: granular security controls that restrict access from business unit application VPCs to only required resources in the central shared services VPC, and scalability to support additional business unit VPCs as the company grows. The suggested answer C leverages AWS PrivateLink, which aligns perfectly with these requirements. PrivateLink enables private, one-way connectivity to specific services hosted in the shared services VPC without granting broad network access to the entire shared VPC, and supports thousands of consumer VPC connections without the scalability limits of alternative connectivity models. It enforces least privilege access by default, as consumer VPCs can only reach the explicitly exposed endpoint service rather than all resources in the shared services VPC, and supports fine-grained IAM and resource policies to restrict access further. Option Analysis: A. Incorrect. A transit gateway with full mesh connectivity grants all application VPCs access to each other and the entire shared services VPC, which violates the least privilege principle and introduces unnecessary security risk. While transit gateways scale well, the full mesh configuration does not provide the required granular security controls, as broad network access is enabled by default. B. Incorrect. VPC peering connections provide full layer 3 connectivity between the shared services VPC and each application VPC by default, requiring manual implementation of NACLs and security groups to restrict access, which is operationally heavy and less granular than PrivateLink. Additionally, VPC peering has a hard limit on the number of peering connections per VPC, which creates scalability issues as more business unit VPCs are added. C. Correct. AWS PrivateLink VPC endpoint services hosted in the shared services VPC expose only specific, preconfigured applications and services to consumer application VPCs. This provides granular, least-privilege access, as consumers cannot access any other resources in the shared services VPC. PrivateLink also scales seamlessly to support thousands of consumer VPC endpoints, avoids IP address overlap conflicts between VPCs, and supports fine-grained access policies to control which business units can access each service, meeting both security and scalability requirements in the most secure manner. D. Incorrect. A transit VPC with VPN appliances is a legacy connectivity pattern that has higher operational overhead, lower performance, and scalability limits compared to native AWS networking services. The full mesh connectivity configuration again grants unnecessary cross-application VPC access, violating least privilege security requirements, and VPN appliances introduce additional management and cost burden. Key Concepts: 1. AWS PrivateLink: A highly available, scalable technology that enables private connectivity between VPCs, AWS services, and on-premises networks without traversing the public internet. It supports granular access control to specific services rather than full VPC-to-VPC connectivity, making it ideal for shared service consumption use cases. 2. Least Privilege Network Access: A core security principle that restricts network connectivity to only the explicit resources required for a workload to function, eliminating broad, unnecessary access such as full mesh VPC connectivity that increases attack surface. 3. VPC Connectivity Pattern Selection: A key ANS-C01 domain topic that requires evaluating connectivity options (PrivateLink, VPC peering, transit gateway, transit VPC) based on security granularity, scalability limits, operational overhead, and use case alignment. References: What is AWS PrivateLink?, https://docs.aws.amazon.com/vpc/latest/privatelink/what-is-privatelink.html Amazon VPC Connectivity Options Whitepaper, https://docs.aws.amazon.com/whitepapers/latest/aws-vpc-connectivity-options/introduction.html

ANS-C01 · Q5

Topic 1 Question #5 A company uses a 4 Gbps AWS Direct Connect dedicated connection with a link aggregation group (LAG) bundle to connect to five VPCs that are deployed in the us-east-1 Region. Each VPC serves a different business unit and uses its own private VIF for connectivity to the on-premises environment. Users are reporting slowness when they access resources that are hosted on AWS.A network engineer finds that there are sudden increases in throughput and that the Direct Connect connection becomes saturated at the same time for about an hour each business day. The company wants to know which business unit is causing the sudden increase in throughput. The network engineer must find out this information and implement a solution to resolve the problem.Which solution will meet these requirements?

A.
Review the Amazon CloudWatch metrics for VirtualInterfaceBpsEgress and VirtualInterfaceBpsIngress to determine which VIF is sending the highest throughput during the period in which slowness is observed. Create a new 10 Gbps dedicated connection. Shift traffic from the existing dedicated connection to the new dedicated connection.
B.
Review the Amazon CloudWatch metrics for VirtualInterfaceBpsEgress and VirtualInterfaceBpsIngress to determine which VIF is sending the highest throughput during the period in which slowness is observed. Upgrade the bandwidth of the existing dedicated connection to 10 Gbps.
C.
Review the Amazon CloudWatch metrics for ConnectionBpsIngress and ConnectionPpsEgress to determine which VIF is sending the highest throughput during the period in which slowness is observed. Upgrade the existing dedicated connection to a 5 Gbps hosted connection.
D.
Review the Amazon CloudWatch metrics for ConnectionBpsIngress and ConnectionPpsEgress to determine which VIF is sending the highest throughput during the period in which slowness is observed. Create a new 10 Gbps dedicated connection. Shift traffic from the existing dedicated connection to the new dedicated connection.

Answer: A

The scenario requires two core outcomes: first, identify which business unit, mapped to an individual private VIF, is generating the traffic that saturates the connection, and second, resolve the 4 Gbps Direct Connect capacity constraint. To isolate traffic per VIF, you must use virtual interface-specific CloudWatch metrics, as connection-level metrics only display aggregate traffic for the entire physical connection and cannot associate traffic with individual VIFs or business units. Dedicated Direct Connect connections have fixed bandwidth set at provisioning, and you cannot modify the bandwidth of an existing dedicated connection. To increase capacity, you must provision a new dedicated connection with the desired higher bandwidth, migrate traffic to the new connection, then decommission the old connection. The suggested answer A meets both requirements: it uses the correct per-VIF metrics to identify the high-throughput VIF associated with the responsible business unit, then follows the supported process to increase Direct Connect capacity by deploying a new 10 Gbps dedicated connection and shifting traffic to it. Option Analysis: A. Correct. This option uses the valid per-VIF CloudWatch metrics VirtualInterfaceBpsEgress and VirtualInterfaceBpsIngress that track throughput per individual virtual interface, so you can map each VIF to its corresponding business unit to identify the source of the traffic spike. It also follows the supported process for increasing dedicated Direct Connect capacity, since existing dedicated connections cannot have their bandwidth modified, so provisioning a new 10 Gbps dedicated connection and migrating traffic to it resolves the saturation issue. B. Incorrect. While the metric selection is accurate, you cannot upgrade the bandwidth of an existing dedicated Direct Connect connection, as dedicated connection bandwidth is fixed at the time of provisioning. This makes the second step of this option invalid. C. Incorrect. The metrics listed, ConnectionBpsIngress and ConnectionPpsEgress, are connection-level metrics that only show aggregate traffic for the entire Direct Connect connection, so they cannot be used to isolate traffic per VIF to identify the responsible business unit. Additionally, hosted connections are provisioned by AWS Direct Connect Partners, not as an upgrade to an existing dedicated connection, and a 5 Gbps connection provides minimal additional capacity that is unlikely to resolve consistent saturation of a 4 Gbps connection. D. Incorrect. The metric selection is invalid, as the connection-level metrics listed do not provide per-VIF traffic data to identify the responsible business unit. While provisioning a new 10 Gbps dedicated connection is a valid step to increase capacity, the first part of this option fails to meet the requirement to identify the causal business unit. Key Concepts: 1. Direct Connect CloudWatch Metric Categories: Direct Connect provides two tiers of CloudWatch metrics: connection-level metrics that aggregate traffic for the entire physical connection, and virtual interface-level metrics that track ingress and egress throughput, packets, and error counts per individual VIF. VirtualInterfaceBpsEgress and VirtualInterfaceBpsIngress are per-VIF metrics that enable granular traffic tracking per connected VPC or business unit. 2. Dedicated Direct Connect Bandwidth Modification Rules: Dedicated Direct Connect connections have fixed bandwidth that is defined during provisioning. You cannot modify the bandwidth of an existing dedicated connection. To increase capacity, you must provision a new dedicated connection with the required bandwidth, migrate your VIFs or traffic to the new connection, then delete the old connection. 3. Direct Connect Connection Types: Dedicated connections are physical connections that a customer provisions directly with AWS for their exclusive use. Hosted connections are provisioned by AWS Direct Connect Partners for end customers, and cannot be used as an upgrade path for existing dedicated connections. References: Monitoring AWS Direct Connect with Amazon CloudWatch, https://docs.aws.amazon.com/directconnect/latest/UserGuide/monitoring-cloudwatch.html AWS Direct Connect Dedicated Connections, https://docs.aws.amazon.com/directconnect/latest/UserGuide/WorkingWithConnections.html#dedicated-connections

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ANS-C01 Practice Exam — ANS-C01：Advanced Networking Specialty

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