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Amazon ANS-C01 Exam - Topic 4 Question 61 Discussion

A company has an AWS Site-to-Site VPN connection between AWS and its branch office. A network engineer is troubleshooting connectivity issues that the connection is experiencing. The VPN connection terminates at a transit gateway and is statically routed. In the transit gateway route table, there are several static route entries that target specific subnets at the branch office.The network engineer determines that the root cause of the issues was the expansion of underlying subnet ranges in the branch office during routine maintenance.Which solution will solve this problem with the LEAST administrative overhead for future expansion efforts?
C) Create a dynamically routed VPN connection on the transit gateway. Connect the dynamically routed VPN connection to the branch office. Create a propagation for the VPN attachment to the transit gateway route table. Remove the existing static VPN connection.
A) Determine a supernet for the branch office. In the transit gateway route table, add an aggregate route that targets the VPN attachment. Replace the specific subnet routes in the transit gateway route table with the new supernet route.
B) Create an AWS Direct Connect gateway and a transit VIF. Associate the Direct Connect gateway with the transit gateway. Create a propagation for the Direct Connect attachment to the transit gateway route table.
D) Create a prefix list that contains the new subnets and the old subnets for the branch office. Remove the specific subnet routes in the transit gateway route table. Create a prefix list reference in the transit gateway route table.

Amazon ANS-C01 Exam - Topic 4 Question 61 Discussion

Actual exam question for Amazon's ANS-C01 exam
Question #: 61
Topic #: 4
[All ANS-C01 Questions]

A company has an AWS Site-to-Site VPN connection between AWS and its branch office. A network engineer is troubleshooting connectivity issues that the connection is experiencing. The VPN connection terminates at a transit gateway and is statically routed. In the transit gateway route table, there are several static route entries that target specific subnets at the branch office.

The network engineer determines that the root cause of the issues was the expansion of underlying subnet ranges in the branch office during routine maintenance.

Which solution will solve this problem with the LEAST administrative overhead for future expansion efforts?

Show Suggested Answer Hide Answer
Suggested Answer: C

by Ines at Mar 03, 2026, 09:44 AM

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Mitsue
24 days ago
Surprised that subnet expansion caused such issues!
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Nicolette
29 days ago
I disagree, C could be more flexible with dynamic routing.
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Albina
1 month ago
Option A seems like the simplest fix for future expansions.
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Johanna
1 month ago
I think B is overkill for this situation. Just keep it simple!
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Cordelia
1 month ago
D sounds complicated. Why not just stick with static routes?
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Oretha
2 months ago
Wow, I didn't know supernetting could simplify things like that!
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Lashawna
2 months ago
I disagree, C might be better for future changes.
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Alecia
2 months ago
Option A seems like the simplest fix. Supernetting is efficient!
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Louann
2 months ago
I lean towards option A too, but I wonder if there are any drawbacks to using a supernet. It seems like it could simplify things, but what if we need to manage specific routes later?
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Arthur
2 months ago
I'm a bit confused about the prefix list in option D. I feel like we covered it, but I can't recall how it would help with the expansion issue.
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Amber
3 months ago
I think we practiced a similar question about route propagation. Option C might be the way to go since it involves dynamic routing, which seems easier for future changes.
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Felton
3 months ago
I remember we discussed supernets in class. Option A sounds familiar, but I'm not entirely sure how to implement it correctly.
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