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Amazon ANS-C01 Exam Questions

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Amazon AWS Certified Advanced Networking - Specialty

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Amazon ANS-C01 Sample Questions – Free Practice Test & Real Exam Prep

Question #1

A company has an AWS environment that includes multiple VPCs that are connected by a transitgateway. The company wants to use a certificate-based AWS Site-to-Site VPN connection to establishconnectivity between an on-premises environment and the AWS environment. The company doesnot have a static public IP address for the on-premises environment.Which combination of steps should the company take to establish VPN connectivity between the transit gateway and the on-premises environment? (Choose two.)

  • A.Create a public certificate in AWS Certificate Manager (ACM).
  • B.Create a private certificate in AWS Certificate Manager (ACM).
  • C.Configure the Site-to-Site VPN tunnels to use the pre-shared key (PSK).
  • D.Create a customer gateway. Specify the current dynamic IP address of the customer gatewaydevice's external interface.
  • E.Create a customer gateway. Do not specify the IP address of the customer gateway device.
Answer: B, D
Explanation:
Create a private certificate in AWS Certificate Manager (ACM): This involves setting up a private
Certificate Authority (CA) within AWS ACM, which will be used to issue certificates for authenticating
your customer gateway device.
Create a customer gateway. Specify the current dynamic IP address of the customer gateway device's
external interface: Even though on-premises environment doesn't have a static IP, you can still
configure the customer gateway in AWS by specifying its current dynamic IP address. This setup
allows AWS to recognize and authenticate your customer gateway device during the VPN connection
establishment.
Question #2

A company has two teams: Team A and Team B. Team A has VPCs that run in AccountA.The teamuses a transit gateway (TGW-A) to route traffic between workloads that run in the different VPCs.Similarly, Team Ð’ has VPCs that run in Account B. Team Ð’ uses a different transit gateway (TGW-B) to route traffic between workloads that run in the different VPCs.The company's network team manages the routing for Team A and Team Ð’. The network team wantsto retire TGW-B and use a single transit gateway to manage routing for the VPCs of both teams.Which solution will meet this requirement with the LEAST operational overhead?

  • A.Create a resource share for TGW-A Share TGW-A with Account B. Create VPC attachments for theVPCs in Account Ð’. Configure routing for the VPCs in TGW-A route tables. Update the route tables ofthe VPCs in Account Ð’ to forward traffic to TGWA.Delete TGW-B attachments and TGW-B
  • A. Share TGW-A with Account Ð’. Replicate the TGW-Bconfiguration to TGW-A to automatically start routing changes for the VPCs in Account Ð’. DeleteTGW-B when routing changes are complete.
  • C.Create a new transit gateway (TGW-C) in AccountA. Create a resource share for TGW-C. ShareTGW-C with Account B. Create VPC attachments for the VPCs in Account A and Account Ð’. Configurerouting for all the VPCs in TGW-C route tables. Update the route tables for the VPCs in Account A andAccount Ð’ to forward traffic to TGW-C. Delete TGW-A attachments and TGW-B attachments. DeleteTGW-A and TGW-B.
  • D.Create a new transit gateway (TGW-C) in a new account (Account C). Create a resource share forTGW-C. Share TGW-C with Account A and Account B. Create VPC attachments for the VPCs inAccount A and Account Ð’. Configure routing for all the VPCs in TGW-C route tables. Update the routetables for the VPCs in Account A and Account Ð’ to forward traffic to TGW-C. Delete TGW-Aattachments and TGW-B attachments. Delete TGW-A and TGW-B.
Answer: A
Explanation:
This solution minimizes operational overhead by using a single transit gateway (TGW-A) for both
teams, while also leveraging resource sharing between accounts. This approach eliminates the need
to create new transit gateways, thus reducing complexity and the operational overhead of managing
multiple transit gateways.
Question #3

A company has several AWS Site-to-Site VPN connections between an on-premises customergateway and a transit gateway. The company's application uses IPv4 to communicate through theVPN connections.The company has updated the VPC to be dual stack and wants to transition to using IPv6-only for newworkloads. When the company tries to communicate through the existing VPN connections, IPv6traffic fails.Which solution will provide IPv6 support with the LEAST operational overhead?

  • A.Create a new Site-to-Site VPN connection that supports IPv6.
  • B.Create a new Site-to-Site VPN connection to a self-managed Amazon EC2 instance that runs opensource software.
  • C.Update the existing Site-to-Site VPN connections to support IPv6.
  • D.Update the on-premises customer gateway's public IP address from IPv4 to IPv6.
Answer: A
Explanation:
IPv6 Support in VPN Connections: Existing AWS Site-to-Site VPN connections that were originally
configured for IPv4 do not automatically support IPv6 traffic. To enable IPv6 communication, a
new Site-to-Site VPN connection must be created that explicitly supports IPv6.
Least Operational Overhead: Creating a new IPv6-enabled Site-to-Site VPN connection is
straightforward and does not require extensive reconfiguration of the existing IPv4 setup. This
ensures a smooth transition to dual-stack or IPv6-only workloads with minimal disruption.
Support for Dual-Stack Workloads: The new IPv6-enabled Site-to-Site VPN connection can coexist
with the existing IPv4 connections, allowing the company to transition workloads incrementally to
IPv6.
Question #4

A company uses transit gateways to route traffic between the company's VPCs. Each transit gatewayhas a single route table. Each route table contains attachments and routes for the VPCs that are inthe same AWS Region as the transit gateway. The route tables in each VPC also contain routes to allthe other VPC CIDR ranges that are available through the transit gateways. Some VPCs route to localNAT gateways.The company plans to add many new VPCs soon. A network engineer needs a solution to add newVPC CIDR ranges to the route tables in each VPC.Which solution will meet these requirements in the MOST operationally efficient way?

  • A.Create a new customer-managed prefix list. Add all VPC CIDR ranges to the new prefix list. Updatethe route tables in each VPC to use the new prefix list ID as the destination and the appropriatetransit gateway ID as the target.
  • B.Turn on default route table propagation for the transit gateway route tables. Turn onroute propagation for each route table in each VPC.
  • C.Update the route tables in each VPC to use 0.0.0.010 as the destination and the appropriate transitgateway ID as the target.
  • D.Turn on default route table association for the transit gateway route tables. Turn on routepropagation for each route table in each VPC.
Answer: A
Explanation:
Using a Prefix List for Route Management: A customer-managed prefix list allows you to group
multiple CIDR ranges into a single logical entity. By referencing the prefix list in VPC route tables, you
can simplify route management. This eliminates the need to manually add individual CIDR ranges to
each VPC route table.
Operational Efficiency: When a new VPC is added, its CIDR range can be added to the prefix list, and
all route tables referencing the prefix list will automatically include the new CIDR. This reduces
operational overhead compared to manually updating each route table.
Flexibility: The prefix list approach is highly scalable and supports the companys need to add many
new VPCs in the future.

Question #5

A company runs a workload in a single VPC on AWS. The companys architecture contains severalinterface VPC endpoints for AWS services, including Amazon CloudWatch Logs and AWS KeyManagement Service (AWS KMS). The endpoints are configured to use a shared security group. Thesecurity group is not used for any other workloads or resources.After a security review of the environment, the company determined that the shared security groupis more permissive than necessary. The company wants to make the rules associated with thesecurity group more restrictive. The changes to the security group rules must not prevent theresources in the VPC from using AWS services through interface VPC endpoints. The changesmust prevent unnecessary access.The security group currently uses the following rules:Inbound - Rule 1Protocol: TCPPort: 443Source: 0.0.0.0/0Inbound - Rule 2Protocol: TCPPort: 443Source: VPC CIDROutbound - Rule 1Protocol: AllPort: AllDestination: 0.0.0.0/0Which rule or rules should the company remove to meet with these requirements?

  • A.Outbound - Rule 2
  • B.Inbound - Rule 1 and Outbound - Rule 1
  • C.Inbound - Rule 2 and Outbound - Rule 1
  • D.Outbound - Rule 1
Answer: B
Explanation:
Inbound Rule 1 (Allow TCP 443 from 0.0.0.0/0): This rule allows all sources, including the public
internet, to access the interface VPC endpoints. Since interface VPC endpoints are used within the
VPC for communication with AWS services, this rule is unnecessarily permissive. Removing this rule
enhances security while still allowing communication within the VPC using Rule 2 (TCP 443 from the
VPC CIDR).
Outbound Rule 1 (Allow All Protocols, All Ports to 0.0.0.0/0): This rule is overly permissive and
unnecessary for interface VPC endpoints, as traffic destined for AWS services through these
endpoints does not need unrestricted outbound access. Removing this rule ensures that outbound
traffic is limited to what is required for communication with the AWS services through the interface
endpoints.
Question #6

A company deployed an application in two AWS Regions in one AWS account. The company has oneVPC in each Region. The VPCs use non-overlapping private CIDR ranges.The company needs to connect both VPCs to a single on-premises data center to test the application.The application requires up to 800 Mbps of throughput. A network engineer needs to establishconnectivity between the VPCs and the on-premises data center.Which solution will meet this requirement with the LEAST operational overhead?

  • A.Order a 2 Gbps Direct Connect connection for the data center. Configure a virtual private gatewayin each VPC. Create a private VIF for each virtual private gateway, and associate the virtual privategateways with the Direct Connect connection. Configure static routes in the VPC route tables and inthe data center router
  • B.Order a 2 Gbps Direct Connect connection for the data center. Configure a virtual private gatewayin each VPC. Create a private VIF for each virtual private gateway, and associate the virtual privategateways with the Direct Connect connection. Configure Open Shortest Path First (OSPF) routingbetween the private VIF and the data center
  • C.Configure a customer gateway and a virtual private gateway in each VPC. Configure an AWS SitetoSite VPN connection between the data center and each VPC. Configure static routes in each VPCroute table to point to the subnets in the data center.
  • D.Configure a customer gateway and a virtual private gateway in each VPC. Configure an AWSSiteto- Site VPN connection between the data center and each VPC. Configure BGP routing betweentheVPCs and the data center.
Answer: A
Explanation:
Direct Connect for High Throughput: The application requires up to 800 Mbps of throughput. AWS
Direct Connect is the best choice for meeting this requirement because it provides a high-bandwidth,
low-latency, and private connection between the on-premises data center and AWS.
Private VIFs for VPC Connectivity: Private virtual interfaces (VIFs) are used to connect to VPCs
through virtual private gateways. Configuring a private VIF for each VPC ensures secure and efficient
connectivity to the on-premises data center.
Static Routes for Simplicity: Using static routes in the VPC route tables and the data center router
minimizes operational overhead compared to dynamic routing protocols like BGP. Static routes are
sufficient for testing purposes and are simpler to configure and maintain.
Question #7

A company has multiple VPCs with subnets that use IPv4. Traffic from the VPCs to the internet uses aNAT gateway. The company wants to transition to IPv6.A network engineer creates multiple IPv6-only subnets in an existing testing VPC. The networkengineer deploys a new Amazon EC2 instance that has an IPv6 address into one of the subnets.During testing, the network engineer discovers that the new EC2 instance is not able tocommunicate with an IPv4-only service through the internet. The network engineer needs to enablethe IPv6 EC2 instance to communicate with the IPv4-only service.Which solution will meet this requirement?

  • A.Enable DNS64 for the IPv6-only subnets. Update the route tables for the IPv6-only subnets to sendtraffic through the NAT gateway.
  • B.Enable NAT64 for the testing VPC. Reconfigure the existing NAT gateway to support IPv6.
  • C.Enable DNS64 for the new EC2 instance. Create a new egress-only internet gateway that supportsIPv6.
  • D.Enable NAT64 for each route table. Create a new NAT gateway that supports both IPv4 and IPv6.
Answer: A
Explanation:
Understanding the Issue: The IPv6-only EC2 instance cannot communicate with IPv4-only services because IPv6 and IPv4 are not directly compatible. To bridge this gap, DNS64 and NAT64 are used
together. However, AWS NAT gateways do not natively support NAT64, but you can use DNS64 to
translate IPv4 DNS records (A records) into IPv6-compatible addresses (AAAA records).
DNS64 for IPv6-Only Subnets: DNS64 is a service that synthesizes AAAA records for IPv4-only
services. This allows IPv6-only clients to resolve IPv4 addresses as IPv6-compatible addresses,
enabling communication through the NAT gateway.
NAT Gateway with Route Table Updates: The NAT gateway enables outbound communication from
private subnets to the internet. Updating the route tables for IPv6-only subnets to send traffic
through the NAT gateway ensures that the IPv6 EC2 instance can reach IPv4 services.
Question #8

A company has a transit gateway in a single AWS account. The company sends flow logs for thetransit gateway to an Amazon CloudWatch Logs log group.The company created an AWS Lambda function to analyze the logs. The Lambda function sends anotification to an Amazon Simple Notification Service (Amazon SNS) topic when a VPC generatestraffic that is dropped by the transit gateway. Each notification contains the account ID. VPC ID, andtotal amount of dropped packets.The company wants to subscribe a new Lambda function to the SNS topic. The new Lambda functionmust automatically prevent the traffic that is identified in each notification from leaving a VPC byapplying a network ACL to the transit gateway attachment subnets in the VPC that generates thetraffic.Which solution will meet these requirements?

  • A.Configure the existing Lambda function to add the destination IP addresses of the dropped trafficto each SNS notification. Configure the new Lambda function to create an outbound rule by using thedestination IP addresses in the network ACL.
  • B.Configure the existing Lambda function to add the source IP addresses of the dropped traffic toeach SNS notification. Configure the new Lambda function to create an inbound rule by using thesource IP addresses in the network ACL.
  • C.Configure the existing Lambda function to add the source IP addresses of the dropped traffic toeach SNS notification. Configure the new Lambda function to create an outbound rule by using the source IP addresses in the network ACL.
  • D.Configure the existing Lambda function to add the destination IP addresses of the dropped trafficto each SNS notification. Configure the new Lambda function to create an inbound rule by using thedestination IP addresses in the network ACL.
Answer: B
Explanation:
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 an inbound rule to 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
Question #9

A company has multiple AWS Site-to-Site VPN connections between an on-premises environmentand multiple VPCs. The Site-to-Site VPN connections use virtual private gateways and are configuredwith IPv4 addresses. The company hosts several internal applications in the VPCs.Application users have reported that the applications are performing slowly. A network engineernotices excessive latency in the network path that the VPN connections use. The network engineerneeds to resolve the excessive latency.Which solution will meet this requirement?

  • A.Use AWS Global Accelerator to deploy an accelerator on the existing Site-to-Site VPN connections.
  • B.Deploy a transit gateway and a new accelerated Site-to-Site VPN connection.
  • C.Replace the existing Site-to-Site VPN connections with new Site-to-Site VPN connections that useIPv6.
  • D.Replace the existing Site-to-Site VPN connections with AWS PrivateLink connections.
Answer: B
Explanation:
Transit Gateway for Centralized Routing: A transit gateway centralizes the management and routing
of multiple Site-to-Site VPN connections. It helps optimize network paths and reduce latency by
avoiding the need for direct peering between each VPC and on-premises.
Accelerated Site-to-Site VPN: AWS accelerated Site-to-Site VPN connections use AWS Global
Accelerator to reduce latency by leveraging the AWS global network to route traffic more efficiently.
This significantly improves the performance of the applications.
Supports Existing IPv4 Configuration: Accelerated VPNs can work with IPv4 addresses, allowing the
company to address latency without requiring migration to IPv6, which would introduce additional
complexity.
Question #10

A company uses AWS Network Firewall to protect outgoing traffic for multiple VPCs that are in thesame AWS account. Each VPC contains Amazon EC2 instances that host the company's applications.Each EC2 instance is tagged with the name of the application it hosts. The EC2 instances are in AutoScaling groups.A Network Firewall stateful rule group must remain up-to-date, even when an Auto Scaling grouplaunches and terminates EC2 instances.Which solution will meet this requirement with the LEAST implementation and administrative effort?

  • A.Create a network ACL for each application. Reference the network ACL in the stateful rule group.
  • B.Create a prefix list for each application. Reference the prefix list in the stateful rule group.
  • C.Create an AWS Lambda function that queries the EC2 instance tags for each application name andthen updates the stateful rule group with the IP address of each instance.
  • D.Create a resource group for each application name. Reference the Amazon Resource Name (ARN)for the resource groups in the stateful rule group.
Answer: B
Explanation:
Prefix Lists: AWS prefix lists are a simple way to manage IP address ranges that can be reused across
security groups, route tables, and firewall rules. By creating a prefix list for each application, you can
group the IP addresses of the EC2 instances that host a specific application.
Dynamic Updates with Minimal Effort: When EC2 instances are launched or terminated in Auto
Scaling groups, the IP ranges can be dynamically updated in the prefix lists. This approach avoids
manual updates to the stateful rule group while ensuring that the rule group remains up-to-date.
Low Administrative Overhead: Referencing the prefix lists in the stateful rule group minimizes the
administrative effort, as any changes to the prefix lists automatically reflect in the firewall rules
without needing direct modifications to the rule group.

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