The answer is to configure BGP communities on the VIFs to influence route preference. This works because BGP communities are tags that can be applied to routes advertised over each Virtual Interface, allowing your on-premises router to match those tags and apply local routing policies—such as setting a higher Local Preference—to force traffic for specific VPCs to always exit through the same VIF, thereby eliminating asymmetric routing. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of how to manipulate path selection without changing AWS-side attributes; a common trap is confusing BGP communities with AS_PATH prepending, which only makes a path less preferred, or assuming you can set Local Preference inside AWS, which is not possible. Remember the memory tip: “Community tags steer the path, while prepending makes it last.”
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 multiple Virtual Interfaces (VIFs) to an on-premises network. The VIFs are associated with a Direct Connect Gateway that is attached to multiple VPCs. The company is experiencing asymmetric routing and wants to ensure that traffic from on-premises to the VPCs always uses the same VIF. Which configuration should be implemented?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure BGP communities on the VIFs to influence route preference
Option A is correct because BGP communities can be used to influence routing decisions on the on-premises router to prefer a specific VIF. Option B is incorrect because Jumbo Frames do not affect routing. Option C is incorrect because the Local Preference attribute is set on the on-premises router, not in AWS. Option D is incorrect because AS_PATH prepending is used to make a path less preferred, not more.
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.
✗
Use AS_PATH prepending on the VIFs to make one path more preferred
Why it's wrong here
AS_PATH prepending makes a path less preferred, not more.
✗
Enable Jumbo Frames on the Direct Connect connection
Why it's wrong here
Jumbo Frames are for MTU, not routing preferences.
✗
Set the Local Preference attribute on the AWS side
Why it's wrong here
Local Preference is a BGP attribute set on the receiving router, not on the AWS side.
✓
Configure BGP communities on the VIFs to influence route preference
Why this is correct
BGP communities allow tagging routes to influence the on-premises router's preference.
Clue confirmation
The clue word "always" 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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 — 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: Configure BGP communities on the VIFs to influence route preference — Option A is correct because BGP communities can be used to influence routing decisions on the on-premises router to prefer a specific VIF. Option B is incorrect because Jumbo Frames do not affect routing. Option C is incorrect because the Local Preference attribute is set on the on-premises router, not in AWS. Option D is incorrect because AS_PATH prepending is used to make a path less preferred, not more.
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: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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