Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 62 discussion

Only one Transit VIF is possible with one Direct connection. With DX gateway, 3 Transit Gateways (same or different regions) can be added. Option B) and D) are correct, though B) itself fulfils the requirement in the question.

B, C - correct. B. Associate TGW-B with the Direct Connect gateway. Advertise the VPC-B CIDR block under the allowed prefixes. This will allow traffic from VPC-B to be sent over the Direct Connect connection to the on-premises data center via TGW-B. C. Configure another transit VIF on the Direct Connect connection and associate TGW-B. Advertise the VPC-B CIDR block under the allowed prefixes. This will enable the use of the Direct Connect connection for VPC-B's traffic by connecting TGW-B to the Direct Connect gateway.

TGW is a regional resource therefore without a direct connect gateway you can't attach/associate the TGW to the transit vif. Hence the janky the peering being the way.

only B is require. Why even need D as question does not ask connectivity between both the VPCs

Only A is require. Why even need D as question does not ask connectivity between both the VPCs

The correct reasons why options B and D are the correct answers: B. Associate TGW-B with the Direct Connect gateway. Advertise the VPC-B CIDR block under the allowed prefixes. This solution provides a direct connection between VPC-B and the on-premises data center in Dublin via the existing Direct Connect gateway. D. Configure inter-Region transit gateway peering between TGW-A and TGW-B. Add the peering routes in the transit gateway route tables. Add both the VPC-A and the VPC-B CIDR block under the allowed prefix list in the Direct Connect gateway association. This solution provides a connection between the two transit gateways, allowing for connectivity between VPC-A and VPC-B, which can then be extended to the on-premises data center in Dublin via the Direct Connect gateway.

Valid Solutions: The two correct solutions are: B: Associate TGW-B with Direct Connect gateway because: Direct Connect gateway supports multiple transit gateway associations Works across regions Simple and direct path D: Configure inter-Region transit gateway peering because: Allows communication between transit gateways Can route traffic through existing Direct Connect setup Provides flexibility for future expansion

They testing your English here, C looks fine but missing *gateway** -- instead it says Direct Connect *connection**. if it would say "gateway", then C would be more optimal -- each TGW connected to DXGW.

BD are the correct answers. 2 TGW's (each in its own region, with peering between them) + 1 DxGW (with transit VIF) + DX connection (to the company's DC)

I think that it's correct answer is BD.

The question seems poorly formatted to me: It should contain only one answer, as it only asks for communication between the TGW-B and the On-Premises, and not the connectivity between the vpcs. "A network engineer must implement connectivity between VPC-B and the on-premises data center in Dublin. Which solutions will meet these requirements?" For me the letter B is correct

B) D) It's not an option of which 2 steps are required to achieve the connectivity, but which 2 solutions can achieve the same result, thus B,D

B & D Correct, implementing either will work.

i think B and D considering 1 direct connect connection only can have 1 Transit VIF

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