- A
A VLAN ID
Each virtual interface is associated with a VLAN.
- B
A public IP address for the BGP peer
Why wrong: Private VIF uses private IP addresses.
- C
A Direct Connect gateway
Why wrong: Direct Connect gateway is used for multiple VPC associations, not required for a single VPC.
- D
BGP session with a customer router and AWS router
BGP is used to exchange routes.
- E
A VPN connection to the VPC
Why wrong: Direct Connect is separate from VPN.
Question 1,095 of 1,705
BGP Session Over Direct Connect Private VIF – VLAN ID and BGP Requirements
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.
Which TWO of the following are required to establish a BGP session over a Direct Connect private virtual interface? (Choose TWO.)
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
✓
A VLAN ID
A VLAN ID is required because a Direct Connect private virtual interface operates over a single 802.1Q VLAN trunk. The VLAN ID uniquely identifies the virtual interface on the Direct Connect connection, allowing multiple virtual interfaces to share the same physical link. Without a VLAN ID, the Layer 2 encapsulation cannot be established, and the BGP session cannot form.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A VLAN ID
Why this is correct
Each virtual interface is associated with a VLAN.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A public IP address for the BGP peer
Why it's wrong here
Private VIF uses private IP addresses.
- ✗
A Direct Connect gateway
Why it's wrong here
Direct Connect gateway is used for multiple VPC associations, not required for a single VPC.
- ✓
BGP session with a customer router and AWS router
Why this is correct
BGP is used to exchange routes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A VPN connection to the VPC
Why it's wrong here
Direct Connect is separate from VPN.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that a Direct Connect gateway is mandatory for any Direct Connect setup, but it is only needed when connecting to multiple VPCs or using a transit gateway; a single VPC can use a virtual private gateway directly without a Direct Connect gateway.
Detailed technical explanation
How to think about this question
Under the hood, the BGP session over a Direct Connect private virtual interface uses eBGP with the customer’s router as one peer and the AWS router as the other, typically advertising VPC CIDR and on-premises prefixes. The VLAN ID (1-4094) must match on both ends, and the interface uses a /30 or /31 subnet for the BGP peering IPs. In a real-world scenario, misconfiguring the VLAN ID or using a duplicate ID on the same Direct Connect connection can cause Layer 2 conflicts, preventing the BGP session from coming up.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A VLAN ID — A VLAN ID is required because a Direct Connect private virtual interface operates over a single 802.1Q VLAN trunk. The VLAN ID uniquely identifies the virtual interface on the Direct Connect connection, allowing multiple virtual interfaces to share the same physical link. Without a VLAN ID, the Layer 2 encapsulation cannot be established, and the BGP session cannot form.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Same concept, more angles
1 more ways this is tested on ANS-C01
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 requirements for establishing an AWS Direct Connect private virtual interface? (Choose two.)
medium- A.Jumbo frames support (MTU 9001).
- B.A public IP address for the VIF.
- C.A public BGP ASN.
- ✓ D.A BGP session between the customer router and the AWS device.
- ✓ E.A VLAN ID that is unique within the Direct Connect connection.
Why D: Option D is correct because a BGP session between the customer router and the AWS device is a fundamental requirement for establishing a private virtual interface. The private VIF uses BGP to exchange routing information (typically a /30 or /31 subnet) between the on-premises network and the VPC, enabling dynamic route advertisement and failover. Without this BGP session, the VIF cannot be activated or used for traffic.
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Last reviewed: Jul 4, 2026
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