- A
Verify that the prefix is included in the allowed prefixes list for the Direct Connect virtual interface
The virtual private gateway only accepts prefixes that are in the allowed prefix list.
- B
Ensure that route propagation is enabled on the VPC route table
Why wrong: Route propagation is for VPN connections, not Direct Connect private VIF.
- C
Check that the BGP ASN on the customer gateway is unique and not conflicting
Why wrong: The BGP session is established, so ASN is fine.
- D
Add a static route in the VPC route table for the on-premises prefix
Why wrong: Static routes are not used with Direct Connect; the virtual private gateway automatically propagates routes that are in the allowed list.
Question 383 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 has a Direct Connect connection with a private VIF to a VPC. They want to use BGP to advertise a specific /24 prefix from their on-premises network to AWS. After configuration, the prefix is not visible in the VPC route tables. The BGP session is established. What should the company check?
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
✓
Verify that the prefix is included in the allowed prefixes list for the Direct Connect virtual interface
When a BGP session is established but the advertised prefix does not appear in VPC route tables, the most likely cause is that the prefix is not included in the allowed prefixes list configured on the Direct Connect virtual interface. AWS uses this list as a prefix filter; any prefix received via BGP that is not in the allowed list is silently ignored and not installed in the VPC route tables.
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.
- ✓
Verify that the prefix is included in the allowed prefixes list for the Direct Connect virtual interface
Why this is correct
The virtual private gateway only accepts prefixes that are in the allowed prefix list.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Ensure that route propagation is enabled on the VPC route table
Why it's wrong here
Route propagation is for VPN connections, not Direct Connect private VIF.
- ✗
Check that the BGP ASN on the customer gateway is unique and not conflicting
Why it's wrong here
The BGP session is established, so ASN is fine.
- ✗
Add a static route in the VPC route table for the on-premises prefix
Why it's wrong here
Static routes are not used with Direct Connect; the virtual private gateway automatically propagates routes that are in the allowed list.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that a BGP session being up guarantees routes are accepted, but the trap here is that AWS applies a mandatory prefix authorization list on Direct Connect virtual interfaces, and candidates overlook this filter when troubleshooting missing routes.
Detailed technical explanation
How to think about this question
The allowed prefixes list on a Direct Connect private virtual interface acts as an inbound prefix filter on the AWS side, similar to a 'prefix-list' in BGP configuration. AWS will only accept and propagate BGP routes that exactly match or fall within the prefixes specified in this list; any other prefixes are discarded. This is a security mechanism to prevent unintended route advertisements from on-premises networks into the VPC.
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.
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: Verify that the prefix is included in the allowed prefixes list for the Direct Connect virtual interface — When a BGP session is established but the advertised prefix does not appear in VPC route tables, the most likely cause is that the prefix is not included in the allowed prefixes list configured on the Direct Connect virtual interface. AWS uses this list as a prefix filter; any prefix received via BGP that is not in the allowed list is silently ignored and not installed in the VPC route tables.
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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Last reviewed: Jul 4, 2026
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