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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 50 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 50
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has an AWS Direct Connect connection between its on-premises data center in the United States (US) and workloads in the us-east-1 Region. The connection uses a transit VIF to connect the data center to a transit gateway in us-east-1.
The company is opening a new office in Europe with a new on-premises data center in England. A Direct Connect connection will connect the new data center with some workloads that are running in a single VPC in the eu-west-2 Region. The company needs to connect the US data center and us-east-1 with the Europe data center and eu-west-2. A network engineer must establish full connectivity between the data centers and Regions with the lowest possible latency.
How should the network engineer design the network architecture to meet these requirements?

  • A. Connect the VPC in eu-west-2 with the Europe data center by using a Direct Connect gateway and a private VIF. Associate the transit gateway in us-east-1 with the same Direct Connect gateway. Enable SiteLink for the transit VIF and the private VIF.
  • B. Connect the VPC in eu-west-2 to a new transit gateway. Connect the Europe data center to the new transit gateway by using a Direct Connect gateway and a new transit VIF. Associate the transit gateway in us-east-1 with the same Direct Connect gateway. Enable SiteLink for both transit VIFs. Peer the two transit gateways.
  • C. Connect the VPC in eu-west-2 to a new transit gateway. Connect the Europe data center to the new transit gateway by using a Direct Connect gateway and a new transit VIF. Create a new Direct Connect gateway. Associate the transit gateway in us-east-1 with the new Direct Connect gateway. Enable SiteLink for both transit VIFs. Peer the two transit gateways.
  • D. Connect the VPC in eu-west-2 with the Europe data center by using a Direct Connect gateway and a private VIF. Create a new Direct Connect gateway. Associate the transit gateway in us-east-1 with the new Direct Connect gateway. Enable SiteLink for the transit VIF and the private VIF.
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Suggested Answer: B 🗳️
by zaazanuna at March 19, 2023, 12:43 a.m.
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study_aws1
Highly Voted 1 year, 9 months ago
B) is correct. Below link (Figure 9) explains. https://aws.amazon.com/blogs/networking-and-content-delivery/introducing-aws-direct-connect-sitelink/
upvoted 11 times
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Spaurito
Most Recent 1 month, 3 weeks ago
C - looks to be the answer. It states a new Direct connect is being created and you have to associate the DX to the existing, not use the same DX.
upvoted 1 times
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woorkim
2 months ago
its B!
upvoted 1 times
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6ad97eb
6 months, 1 week ago
Associate the transit gateway in us-east-1 with the same Direct Connect gateway. Enable SiteLink for both transit VIFs This is not even required
upvoted 1 times
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Raphaello
8 months, 2 weeks ago
Selected Answer: B
B is the correct answer. One DxGW can connect to up to 6 TGW in different accounts and regions. SiteLink will enable the on-prem DC's to communicate via DxGW and the underlying DX connection. Peering TGW will ensure VPC's in the 2 AWS regions connect.
upvoted 1 times
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tromyunpak
9 months ago
The answer is B - C&D are wrong. Sitelink works if the vifs are using the same DXGW. A caters to the on-premises connectivity but not the VPC connectivity since there is no TGW in eu-west-2
upvoted 1 times
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marfee
10 months, 2 weeks ago
I think that it's correcty answer is B.
upvoted 2 times
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Arad
1 year, 1 month ago
Selected Answer: B
B is correct answer.
upvoted 1 times
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Mishranihal737
1 year, 4 months ago
Yes B is correct
upvoted 1 times
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Certified101
1 year, 4 months ago
Selected Answer: B
Options A, C, and D are not suitable as they do not fully satisfy the requirements, especially regarding achieving the lowest possible latency. For instance, option A does not provide for peering between the two transit gateways, and options C and D suggest the use of multiple Direct Connect gateways which is not necessary and could potentially introduce more latency and complexity to the setup.
upvoted 2 times
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DeathFrmAbv
1 year, 5 months ago
was hard to decide between A and B as both have One direct connect gateway (least hops), in the case of A it was associated with private VIF whereas B is transit VIF. Since transit gateway seems best practice architecture (even through the EU region has 1 VPC only), I go with B.
upvoted 1 times
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rhinozD
1 year, 7 months ago
Selected Answer: B
I think C is also doable even the SiteLink part won't help. But the traffic can go around via the Transit Gateway peering. However, C costs you more money and it gets higher latency than B. The answer is B.
upvoted 3 times
study_aws1
1 year, 7 months ago
Option C) & D) will not work as DC connectivity through Sitelink will require the same Direct Connect gateway. The reason transit gateway peering is used is to connect VPCs in 2 regions as per the question. That is why option B), else option A) would have made it.
upvoted 2 times
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printfmarcelo
1 year, 8 months ago
Selected Answer: B
i agree with zaazanuna B - correct. This solution creates a new transit gateway in the eu-west-2 Region and connects it to the VPC in that Region.
upvoted 2 times
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helloworldabc
1 year, 9 months ago
BBBBBBBBBBBBBBB
upvoted 2 times
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zaazanuna
1 year, 9 months ago
B - correct. This solution creates a new transit gateway in the eu-west-2 Region and connects it to the VPC in that Region. The Europe data center is connected to the new transit gateway using a Direct Connect gateway and a new transit VIF. The transit gateway in us-east-1 is associated with the same Direct Connect gateway, and both transit VIFs are enabled with SiteLink. The two transit gateways are then peered, allowing full connectivity between the data centers and Regions with the lowest possible latency. This solution is cost-effective and efficient as it does not require creating a new Direct Connect gateway.
upvoted 3 times
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A (35%)
C (25%)
B (20%)
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