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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 171 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 171
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has a total of 30 VPCs. Three AWS Regions each contain 10 VPCs. The company has attached the VPCs in each Region to a transit gateway in that Region. The company also has set up inter-Region peering connections between the transit gateways.

The company wants to use AWS Direct Connect to provide access from its on-premises location for only four VPCs across the three Regions. The company has provisioned four Direct Connect connections at two Direct Connect locations.

Which combination of steps will meet these requirements MOST cost-effectively? (Choose three.)

  • A. Create four virtual private gateways. Attach the virtual private gateways to the four VPCs.
  • B. Create a Direct Connect gateway. Associate the four virtual private gateways with the Direct Connect gateway.
  • C. Create four transit VIFs on each Direct Connect connection. Associate the transit VIFs with the Direct Connect gateway.
  • D. Create four transit VIFs on each Direct Connect connection. Associate the transit VIFs with the four virtual private gateways.
  • E. Create four private VIFs on each Direct Connect connection to the Direct Connect gateway.
  • F. Create an association between the Direct Connect gateway and the transit gateways.
Show Suggested Answer Hide Answer
Suggested Answer: ABE 🗳️
by backspace0900 at March 20, 2024, 12:25 p.m.
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psou7
Highly Voted 1 year, 1 month ago
ABE TGW for inter VPC peering within AWS. From on-prem access to only 4 VPCs is required. Hence DXGW and VGW via private VIF. Peering TGW with DXGW would be possible for on-prem connectivity but is more costly. https://docs.aws.amazon.com/whitepapers/latest/hybrid-connectivity/aws-dx-dxgw-with-vgw-multi-regions-and-aws-public-peering.html
upvoted 11 times
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Hubabi
Most Recent 2 months ago
Selected Answer: ABE
From the options presented, it's clear that you need to use DXGW. The only option where "Create a Direct Connect gateway" is stated is option (B). Option (B) also states "Associate the four virtual private gateways with the Direct Connect gateway", thus you need to pick the other two remaining options that make sense with VGW - (A) and (E). Regardless what the cost is, this is the only valid answer that you can select.
upvoted 1 times
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woorkim
4 months, 3 weeks ago
Selected Answer: ABE
TGW is asking more cost!
upvoted 2 times
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MO_SAM
6 months, 3 weeks ago
Selected Answer: BCF
Since there already and exciting TWG there is no need to create VGW and private VIFs, instead just create 4 transit VIF along with DXGW and association to connect things together and hence COST is the main factor!
upvoted 1 times
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VerRi
7 months ago
Selected Answer: ABE
BCF is a good practice but ABE is cheaper.
upvoted 1 times
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AlirezaNetWorld
7 months, 2 weeks ago
BCF based on the current setup on AWS.
upvoted 1 times
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cerifyme85
1 year ago
Selected Answer: ABE
TGW for inter VPC peering within AWS. From on-prem access to only 4 VPCs is required. Hence DXGW and VGW via private VIF. Peering TGW with DXGW would be possible for on-prem connectivity but is more costly.
upvoted 3 times
cerifyme85
1 year ago
If the option was to use TGW, they would have provided an option in the answer to connect DX Gateway to TGW. Also the conectivity to "only" for VPCs does not affect the architecture design as Psou7 said, and given the above, both VPG and TG would work, it is just which one is less expensive.. OR which combination of answers helps. VPG ==> VPG +DXG + PVIF TGW ==> TGW + DXG + TVIF The above options ==> so ABE
upvoted 2 times
victian
1 month, 3 weeks ago
if use TGW ==> TGW + DXG + TVIF solution，option C and F are enough？
upvoted 1 times
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cerifyme85
1 year ago
Also only need one TGW per region .. we have 3 regions, question does not give the split per region.... so not 4 TGW
upvoted 1 times
cerifyme85
1 year ago
Sorry guys just an adjustment in understanding : connecting to VPC directly ==> PVIF + DXG + VPG
upvoted 2 times
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KobDragoon
1 year, 1 month ago
Selected Answer: ABE
As there is no answer that allows us to configure specific route tables in the TGW to make the DataCenters really only have access to 4 of the 30 VPCs. The most logical solution is ABE, as the other options would allow access to more VPCs than intended.
upvoted 4 times
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tromyunpak
1 year, 1 month ago
ABE are the correct answer as these are required to build the VPG setup. CD are wrong due to the fact all the VPC will access the onpremises (you need to configure the 4 specific VPC prefixes in the DX gateway to TGW association or use different routing tables within the TGW to limit the routes to only the 4 VPCs required to access the on-premises) F is not needed since VPG will be used
upvoted 2 times
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backspace0900
1 year, 1 month ago
Selected Answer: BCF
BCF DirectConnectGateway TransitVIF TransitGateway
upvoted 3 times
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