The answer is a unique VLAN ID and a BGP session. These two requirements are fundamental because the private virtual interface (VIF) operates as a Layer 2 Ethernet connection that must be isolated from other traffic on the same Direct Connect link, so a VLAN ID that is unique within the connection ensures proper segmentation, while BGP is mandatory for exchanging routes between your on-premises router and AWS, as Direct Connect does not support static routing for private VIFs. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of the core prerequisites for establishing a private VIF, often appearing as a trap where candidates mistakenly think a public ASN is required—but private ASNs are perfectly acceptable. Another common pitfall is confusing private VIFs with public VIFs, which are used for AWS public services. Remember the memory tip: "Private needs a unique VLAN and BGP, not a public ASN."
ANS-C01 Network Implementation Practice Question
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.
Which TWO of the following are requirements for establishing an AWS Direct Connect private virtual interface? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A BGP session between the customer router and the AWS device.
Options A and C are correct. A: You need a VLAN ID that matches on both sides. C: BGP session is required for routing. B is wrong because you can use a private virtual interface without a public ASN; private ASNs are allowed. D is wrong because public virtual interfaces are for public services. E is wrong because Jumbo frames are optional.
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.
✗
Jumbo frames support (MTU 9001).
Why it's wrong here
Jumbo frames are supported but not required.
✗
A public IP address for the VIF.
Why it's wrong here
Private VIF uses private IPs; public VIF uses public IPs.
✗
A public BGP ASN.
Why it's wrong here
You can use private ASN (64512-65534) for private VIF.
✓
A BGP session between the customer router and the AWS device.
Access ports place end devices into a single VLAN.
✓
A VLAN ID that is unique within the Direct Connect connection.
Why this is correct
VLAN tagging is used to separate virtual interfaces.
Related concept
Access ports place end devices into a single VLAN.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. 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. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: A BGP session between the customer router and the AWS device. — Options A and C are correct. A: You need a VLAN ID that matches on both sides. C: BGP session is required for routing. B is wrong because you can use a private virtual interface without a public ASN; private ASNs are allowed. D is wrong because public virtual interfaces are for public services. E is wrong because Jumbo frames are optional.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are required to establish a BGP session over a Direct Connect private virtual interface? (Choose TWO.)
hard
✓ A.A VLAN ID
B.A public IP address for the BGP peer
C.A Direct Connect gateway
✓ D.BGP session with a customer router and AWS router
E.A VPN connection to the VPC
Why A: Options A and C are correct. A VLAN ID is required to tag the traffic on the physical connection. BGP session with Autonomous System Numbers (ASN) is required for routing. Option B is wrong because a public IP is not used on private VIF; private IP addresses are used. Option D is wrong because a VPN connection is separate. Option E is wrong because a Direct Connect gateway is optional for connecting to multiple VPCs.
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Question Discussion
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