This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 network engineer is designing a hybrid network using AWS Direct Connect. The company requires high availability and wants to use a single AWS Direct Connect location with two connections from different customer routers. Which solution meets the high availability requirement?
Use a single AWS Direct Connect connection with multiple VLANs
Why wrong: Multiple VLANs don't provide physical redundancy.
B
Use a single AWS Direct Connect connection with two BGP sessions
Why wrong: Single connection is a single point of failure.
C
Use two AWS Direct Connect connections from the same location, each connected to a different customer router, and configure BGP sessions over both connections
Two connections from different routers provide router-level redundancy.
D
Use a single AWS Direct Connect connection with Bidirectional Forwarding Detection (BFD) enabled
Why wrong: BFD provides fast failure detection but not physical redundancy.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use two AWS Direct Connect connections from the same location, each connected to a different customer router, and configure BGP sessions over both connections
Option A is correct because using two connections (primary and backup) from different customer routers to the same Direct Connect location provides redundancy at the router level. Option B is wrong because a single connection is a single point of failure. Option C is wrong because multiple VLANs on one connection do not provide physical redundancy. Option D is wrong because BFD does not provide physical redundancy.
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.
✗
Use a single AWS Direct Connect connection with multiple VLANs
Why it's wrong here
Multiple VLANs don't provide physical redundancy.
✗
Use a single AWS Direct Connect connection with two BGP sessions
Why it's wrong here
Single connection is a single point of failure.
✓
Use two AWS Direct Connect connections from the same location, each connected to a different customer router, and configure BGP sessions over both connections
Why this is correct
Two connections from different routers provide router-level redundancy.
Related concept
Access ports place end devices into a single VLAN.
✗
Use a single AWS Direct Connect connection with Bidirectional Forwarding Detection (BFD) enabled
Why it's wrong here
BFD provides fast failure detection but not physical redundancy.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
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: Use two AWS Direct Connect connections from the same location, each connected to a different customer router, and configure BGP sessions over both connections — Option A is correct because using two connections (primary and backup) from different customer routers to the same Direct Connect location provides redundancy at the router level. Option B is wrong because a single connection is a single point of failure. Option C is wrong because multiple VLANs on one connection do not provide physical redundancy. Option D is wrong because BFD does not provide physical redundancy.
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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