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AWS ANS-C01 Sample Questions with Explanations

April 25, 2026

AWS ANS-C01 sample questions with explanations, traps, topic labels, and IT Mastery route links.

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These original sample questions are designed to help you check how the exam topics appear in decision-style prompts. They are not taken from the live exam.

Use these sample questions as a guided self-assessment for AWS Certified Advanced Networking - Specialty (ANS-C01) topics such as hybrid connectivity, Transit Gateway routing, VPC endpoint design, DNS resolution, network security, edge services, observability, and failover behavior. The prompts emphasize path reasoning rather than service-name memorization.

Where these questions fit in the ANS-C01 guide

The sample set below is part of the AWS ANS-C01 guide path:

ANS-C01 advanced networking sample questions

Work through each prompt before opening the explanation. ANS-C01 questions usually reward answers that trace source, destination, route, security control, DNS, return path, and failover behavior.

Question 1

Topic: Hybrid connectivity with resilience

A company connects an on-premises data center to AWS for latency-sensitive internal applications. The link must use private connectivity, support dynamic routing, and continue operating if one physical location or device path fails. Which design is strongest?

  • A. A single AWS Site-to-Site VPN tunnel from one on-premises router to one VPC.
  • B. Direct Connect connections in separate locations with BGP, redundant customer devices, and VPN backup if encryption or failover coverage requires it.
  • C. Public internet access through NAT gateways because NAT is highly available inside one Region.
  • D. One VPC peering connection from the data center to the application VPC.

Best answer: B

Explanation: The requirement combines private connectivity, dynamic routing, and resiliency across failure points. Redundant Direct Connect design with BGP and diverse locations is the strongest baseline, with VPN as a common backup or encryption complement when the scenario requires it.

Why the other choices are weaker:

  • A is a single-path design and does not satisfy the resilience requirement.
  • C uses public internet paths and does not solve private hybrid connectivity.
  • D misuses VPC peering; peering is not an on-premises connectivity primitive.

What this tests: Direct Connect, VPN backup, BGP, device/location diversity, and hybrid failover design.

Related topics: Direct Connect; VPN; BGP; Hybrid networking

Question 2

Topic: Scaling multi-VPC routing

An organization has dozens of VPCs across multiple accounts. Teams need controlled connectivity to shared services, inspection, and on-premises networks without building a full mesh of VPC peering connections. What is the strongest architecture?

  • A. Create peering connections between every VPC pair and manually update all route tables.
  • B. Use AWS Transit Gateway with segmented route tables, controlled propagation, and shared-services or inspection attachments as needed.
  • C. Put all workloads into one very large VPC so route design is no longer needed.
  • D. Use public IP addresses between VPCs and rely on security groups for segmentation.

Best answer: B

Explanation: Transit Gateway is the common advanced-networking answer for many VPCs, many accounts, shared services, hybrid reachability, and route segmentation. Multiple route tables help enforce which attachments can reach each other.

Why the other choices are weaker:

  • A creates an operationally brittle mesh and does not support transitive routing.
  • C weakens account and workload isolation and does not fit organizational scale.
  • D increases public exposure and avoids the private routing problem.

What this tests: Transit Gateway, route tables, propagation, segmentation, shared services, and peering limitations.

Related topics: Transit Gateway; Multi-account; Segmentation; Route tables

Question 3

Topic: Private endpoint troubleshooting

A workload in a private subnet should reach a supported AWS service through an interface VPC endpoint. The endpoint exists, but traffic still goes to the public service address and fails the compliance review. What should the network engineer check first?

  • A. Whether private DNS is enabled for the endpoint and whether the VPC resolver path returns the endpoint private addresses.
  • B. Whether the workload has a larger instance type.
  • C. Whether the service is added to a public hosted zone owned by the application team.
  • D. Whether the subnet has more available IPv6 addresses.

Best answer: A

Explanation: Interface endpoint success often depends on DNS resolution as much as endpoint creation. If names still resolve publicly, traffic can miss the intended private endpoint path.

Why the other choices are weaker:

  • B changes compute capacity, not name resolution or path selection.
  • C may make DNS more confusing and does not address the managed endpoint private-DNS behavior.
  • D is unrelated unless the stem specifically indicates IPv6 endpoint design.

What this tests: Interface VPC endpoints, private DNS, resolver behavior, compliance paths, and troubleshooting order.

Related topics: VPC endpoints; Private DNS; Resolver; Troubleshooting

Question 4

Topic: Choosing the right load-balancing layer

A team is placing third-party inspection appliances between workloads and the internet. Traffic must be inserted transparently through the appliance fleet, scale horizontally, and preserve the network inspection pattern. Which AWS load-balancing option is the strongest fit?

  • A. Application Load Balancer because it offers HTTP routing rules.
  • B. Network Load Balancer because it handles TCP efficiently for every appliance pattern.
  • C. Gateway Load Balancer because it is designed for transparent insertion and scaling of virtual appliances.
  • D. Route 53 weighted records because DNS alone inserts appliances into the packet path.

Best answer: C

Explanation: Gateway Load Balancer is the AWS service built for deploying and scaling third-party virtual appliances in the traffic path. The clue is transparent inspection, not HTTP routing or ordinary TCP load balancing.

Why the other choices are weaker:

  • A fits layer-7 application routing, not transparent network appliance insertion.
  • B is strong for many TCP/UDP patterns, but GWLB is the appliance-insertion service.
  • D can influence name resolution but does not place appliances in the path.

What this tests: GWLB, inspection VPC patterns, load-balancer layer choice, and appliance scaling.

Related topics: Gateway Load Balancer; Inspection; Load balancing; Network security

Independent study note

Tech Exam Lexicon and IT Mastery are independent study tools. They are not affiliated with, endorsed by, or sponsored by Amazon Web Services, AWS, or any certification body.

Revised on Sunday, May 10, 2026
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