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

B) is correct. Below link (Figure 9) explains. https://aws.amazon.com/blogs/networking-and-content-delivery/introducing-aws-direct-connect-sitelink/

Option B is correct Here's why: Connecting the VPC in eu-west-2 to a new transit gateway (Option B) allows the network engineer to create a separate logical connection between the two Regions. This provides better isolation and control over traffic flow. The Europe data center connects to the new transit gateway by using a Direct Connect gateway and a new transit VIF. This establishes a direct, private connection between the data centers, reducing latency and improving performance. Associating the transit gateway in us-east-1 with the same Direct Connect gateway enables SiteLink between the two Regions. This allows traffic to move seamlessly between the data centers, even if they are not directly connected by a VIF. Enabling SiteLink for both transit VIFs ensures that traffic can be routed correctly between the regions. The other options do not provide the same level of isolation and control over traffic flow as Option B.

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.

its B!

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

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.

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

I think that it's correcty answer is B.

B is correct answer.

Yes B is correct

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.

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.

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.

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.

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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.