- A
The Direct Connect route is more specific than the VPN route.
Why wrong: More specific routes are preferred, but if both are the same prefix, the BGP decision process would consider other attributes.
- B
The VPN BGP route has a longer AS path than the Direct Connect route.
Why wrong: Longer AS path makes the route less preferred, so traffic would still go via Direct Connect.
- C
The VPN route has a lower local preference than the Direct Connect route.
Why wrong: Lower local preference makes the route less preferred, so traffic would still go via Direct Connect.
- D
The BGP session with the Direct Connect router is still established because the physical link is up, but the link is not forwarding traffic.
If the BGP session remains established, routes are still advertised and the Direct Connect route remains in the routing table, causing traffic to still be sent.
Quick Answer
The answer is that the BGP session remains established because the physical link is still up, preventing route withdrawal until the BGP hold timer expires. In a Direct Connect failover scenario, the BGP hold timer defaults to 90 seconds, meaning the router will continue advertising the Direct Connect route even when traffic stops flowing, as long as layer 2 connectivity persists. This tests your understanding that BGP relies on session state, not actual data-plane forwarding, to determine route validity—a common trap on the ANS-C01 exam where candidates assume a failed link immediately triggers failover. The key insight is that Direct Connect failover depends on BGP timers, not physical link status; the VPN backup only activates after the hold timer expires and the route is removed. Memory tip: think of the hold timer as a stubborn gatekeeper—it won’t open the backup path until it’s absolutely sure the primary is dead.
ANS-C01 Network Implementation Practice Question
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.
A company has a Direct Connect connection with a private VIF to a VPC. The company also has a Site-to-Site VPN connection to the same VPC as a backup. During a failover test, traffic from on-premises to the VPC continues to use the Direct Connect even after it is intentionally failed. The BGP timers are set to default values. What is the most likely cause?
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 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
The BGP session with the Direct Connect router is still established because the physical link is up, but the link is not forwarding traffic.
Option C is correct because even if the Direct Connect fails, the BGP session may remain established if there is still layer 2 connectivity (e.g., the physical link is up but degraded). The route will remain in the routing table until the BGP hold timer expires. Option A is wrong because longer AS path actually makes the route less preferred. Option B is wrong because the VPN route may have a longer AS path or a different prefix length. Option D is wrong because local preference is typically set to favor Direct Connect over VPN.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 Direct Connect route is more specific than the VPN route.
Why it's wrong here
More specific routes are preferred, but if both are the same prefix, the BGP decision process would consider other attributes.
- ✗
The VPN BGP route has a longer AS path than the Direct Connect route.
Why it's wrong here
Longer AS path makes the route less preferred, so traffic would still go via Direct Connect.
- ✗
The VPN route has a lower local preference than the Direct Connect route.
Why it's wrong here
Lower local preference makes the route less preferred, so traffic would still go via Direct Connect.
- ✓
The BGP session with the Direct Connect router is still established because the physical link is up, but the link is not forwarding traffic.
Why this is correct
If the BGP session remains established, routes are still advertised and the Direct Connect route remains in the routing table, causing traffic to still be sent.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
- →
Network Implementation — study guide chapter
Learn the concepts, then practise the questions
- →
Network Implementation practice questions
Targeted practice on this topic area only
- →
All ANS-C01 questions
1,705 questions across all exam domains
- →
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
- →
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related ANS-C01 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Network Management and Operations practice questions
Practise ANS-C01 questions linked to Network Management and Operations.
Network Security, Compliance and Governance practice questions
Practise ANS-C01 questions linked to Network Security, Compliance and Governance.
Network Design practice questions
Practise ANS-C01 questions linked to Network Design.
Network Implementation practice questions
Practise ANS-C01 questions linked to Network Implementation.
ANS-C01 fundamentals practice questions
Practise ANS-C01 questions linked to ANS-C01 fundamentals.
ANS-C01 scenario practice questions
Practise ANS-C01 questions linked to ANS-C01 scenario.
ANS-C01 troubleshooting practice questions
Practise ANS-C01 questions linked to ANS-C01 troubleshooting.
Practice this exam
Start a free ANS-C01 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The BGP session with the Direct Connect router is still established because the physical link is up, but the link is not forwarding traffic. — Option C is correct because even if the Direct Connect fails, the BGP session may remain established if there is still layer 2 connectivity (e.g., the physical link is up but degraded). The route will remain in the routing table until the BGP hold timer expires. Option A is wrong because longer AS path actually makes the route less preferred. Option B is wrong because the VPN route may have a longer AS path or a different prefix length. Option D is wrong because local preference is typically set to favor Direct Connect over VPN.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 20, 2026
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.