The answer is that the virtual private gateway does not filter routes based on BGP communities, so you must use a prefix list instead. BGP communities are only metadata tags applied to routes for policy routing or marking, but the Direct Connect virtual private gateway (VGW) ignores these tags when deciding whether to accept or reject a prefix. To restrict which on-premises prefixes are learned, you must configure a customer-managed prefix list on the VGW or use route table filtering. This question tests your understanding of how BGP community filtering works in the context of AWS Direct Connect, a common trap on the ANS-C01 exam where candidates assume the VGW natively filters by community like a router would. Remember: communities tag, prefix lists filter. A useful memory tip is “Tags don’t block—lists lock.”
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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.
A company has a VPC with an AWS Direct Connect private VIF connected to a virtual private gateway. The on-premises network uses BGP to advertise routes to AWS. The network team wants to ensure that only specific prefixes from on-premises are accepted. They configure the virtual private gateway with a BGP community. However, after configuration, they notice that all prefixes are still being accepted. What is the MOST likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The virtual private gateway does not filter routes based on BGP communities; you need to use a prefix list.
BGP communities are used for tagging routes, but the virtual private gateway does not filter based on communities by default. To filter, you must use a customer-managed prefix list or a route table that only accepts specific prefixes. Option C is correct. Option A is not a common issue. Option B is not required. Option D is false because BGP communities are supported.
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.
✗
The virtual private gateway needs to have the BGP community enabled.
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The BGP community is not being advertised by the on-premises router.
Why it's wrong here
The community is set on the AWS side.
✗
The BGP community must be configured on the customer gateway device.
Why it's wrong here
Community is set on AWS side.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
Got this wrong? Here's your next step.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The virtual private gateway does not filter routes based on BGP communities; you need to use a prefix list. — BGP communities are used for tagging routes, but the virtual private gateway does not filter based on communities by default. To filter, you must use a customer-managed prefix list or a route table that only accepts specific prefixes. Option C is correct. Option A is not a common issue. Option B is not required. Option D is false because BGP communities are supported.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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