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Exam AWS Certified Advanced Networking - Specialty ANS-C01 All Questions

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

  • 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.
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Suggested Answer: C 🗳️

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Kupaloid
Highly Voted 7 months, 1 week ago
Selected Answer: C
Move from static to dynamic routing to remove administrative overhead
upvoted 9 times
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woorkim
Most Recent 2 weeks ago
Selected Answer: C
A: Using a supernet (aggregate route) can work if the branch office subnets fit neatly within a single supernet. However, if future expansions include subnets outside the supernet, manual updates will still be required. This does not fully solve the problem of minimizing administrative overhead. B: While AWS Direct Connect offers high bandwidth and low latency, it is unnecessary for addressing the root cause (static route updates). It also involves additional costs and complexity. D: A prefix list simplifies management compared to individual static routes, but it still requires manual updates whenever new subnets are added or existing ones change. This does not eliminate administrative overhead as effectively as dynamic routing.
upvoted 1 times
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Spaurito
1 month, 2 weeks ago
C - Let dynamic routing do the work. Static routes are operational overhead.
upvoted 2 times
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6cae226
3 months, 3 weeks ago
Selected Answer: A
The solution that provides the LEAST administrative overhead for future expansion efforts is Option A. By determining a supernet and using an aggregate route, you can significantly reduce the need for future updates to the Transit Gateway route table as the branch office network expands. This approach ensures that as long as the expansion stays within the defined supernet, no further route updates will be necessary.
upvoted 1 times
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rltk8029
7 months, 4 weeks ago
Why not C? Site-to-Site VPN config lets use BGP. As a traditional network engineer I'd always prefer dynamic routing.
upvoted 4 times
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973b658
8 months, 2 weeks ago
Selected Answer: A
it is A.
upvoted 2 times
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JoellaLi
8 months, 3 weeks 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
9 months, 1 week ago
A - Correct
upvoted 4 times
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psou7
9 months, 1 week ago
I vote C
upvoted 1 times
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