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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 183 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 183
Topic #: 1
[All AWS Certified Advanced Networking - Specialty 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?

  • 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.
  • 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.
  • 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.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by psou7 at March 21, 2024, 7:59 a.m.
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Kupaloid
16 hours, 24 minutes ago
Selected Answer: C
Move from static to dynamic routing to remove administrative overhead
upvoted 1 times
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rltk8029
2 weeks, 3 days ago
Why not C? Site-to-Site VPN config lets use BGP. As a traditional network engineer I'd always prefer dynamic routing.
upvoted 2 times
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973b658
1 month, 1 week ago
Selected Answer: A
it is A.
upvoted 1 times
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JoellaLi
1 month, 1 week ago
Selected Answer: D
You can reference a prefix list in your transit gateway route table. A prefix list is a set of one or more CIDR block entries that you define and manage. You can use a prefix list to simplify the management of the IP addresses that you reference in your resources to route network traffic. For example, if you frequently specify the same destination CIDRs across multiple transit gateway route tables, you can manage those CIDRs in a single prefix list, instead of repeatedly referencing the same CIDRs in each route table. If you need to remove a destination CIDR block, you can remove its entry from the prefix list instead of removing the route from every affected route table. When you create a prefix list reference in your transit gateway route table, each entry in the prefix list is represented as a route in your transit gateway route table.
upvoted 2 times
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Kayceetalks
1 month, 3 weeks ago
A - Correct
upvoted 3 times
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psou7
1 month, 3 weeks ago
I vote C
upvoted 1 times
...

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