- A
Configure the LGW VLAN interface with the correct VLAN ID that matches the on-premises VLAN.
The VLAN ID must match for Layer 2 connectivity.
- B
Create a VPC peering connection between the Outposts VPC and the on-premises network via the LGW.
Why wrong: VPC peering is Layer 3, not Layer 2.
- C
Set up a Direct Connect private virtual interface from the on-premises router to the Outposts VPC.
Why wrong: Direct Connect is not required for Outposts local gateway.
- D
Attach the Outposts VPC to a Transit Gateway and peer with on-premises network.
Why wrong: Transit Gateway is Layer 3, not Layer 2.
Question 576 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating its on-premises data center to AWS and wants to extend its Layer 2 network to AWS using AWS Outposts. The company has an existing VLAN with IP subnet 10.0.1.0/24 that hosts a legacy application requiring direct Layer 2 connectivity between on-premises servers and Outposts racks. The network engineer has installed an Outposts rack in the data center and connected it to the on-premises network via a local gateway (LGW) with a VLAN interface. The engineer has created a subnet in the Outposts VPC with CIDR 10.0.1.0/24 and launched EC2 instances. However, the on-premises servers cannot communicate with the Outposts instances. The LGW is configured correctly. Which action should the engineer take to resolve the issue?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the LGW VLAN interface with the correct VLAN ID that matches the on-premises VLAN.
Option A is correct because the LGW VLAN interface must be configured with the same VLAN ID as the on-premises VLAN to allow Layer 2 communication. Option B is incorrect because a VPC peering connection operates at Layer 3, not Layer 2. Option C is incorrect because Direct Connect is not required for this Layer 2 extension. Option D is incorrect because a Transit Gateway does not provide Layer 2 extension.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the LGW VLAN interface with the correct VLAN ID that matches the on-premises VLAN.
- ✗
Create a VPC peering connection between the Outposts VPC and the on-premises network via the LGW.
Why it's wrong here
VPC peering is Layer 3, not Layer 2.
- ✗
Set up a Direct Connect private virtual interface from the on-premises router to the Outposts VPC.
Why it's wrong here
Direct Connect is not required for Outposts local gateway.
- ✗
Attach the Outposts VPC to a Transit Gateway and peer with on-premises network.
Why it's wrong here
Transit Gateway is Layer 3, not Layer 2.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related ANS-C01 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Configure the LGW VLAN interface with the correct VLAN ID that matches the on-premises VLAN. — Option A is correct because the LGW VLAN interface must be configured with the same VLAN ID as the on-premises VLAN to allow Layer 2 communication. Option B is incorrect because a VPC peering connection operates at Layer 3, not Layer 2. Option C is incorrect because Direct Connect is not required for this Layer 2 extension. Option D is incorrect because a Transit Gateway does not provide Layer 2 extension.
What should I do if I get this ANS-C01 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related ANS-C01 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 20, 2026
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