ANS-C01 Network Implementation Practice Question
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.
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.
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.
Why this is correct
The VLAN ID must match for Layer 2 connectivity.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.