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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 250 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 250
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company runs applications in two VPCs that are in separate AWS Regions. One VPC is in the us-east-1 Region. The second VPC is in the us-west-1 Region. The company needs to establish connectivity between the two VPCs. The company also needs to connect the VPCs to applications that run in an on-premises data center.

The current traffic requirement between the VPCs is 50 ТВ per month. The company expects traffic volume between the VPCs to increase. The traffic requirement from the VPCs to the on-premises data center is 10 ТВ per month. The company expects the traffic between the VPCs and the data center to remain constant.

Which solution will meet these requirements MOST cost-effectively?

  • A. Create a transit gateway in each Region. Create VPN connections from the transit gateways to the on-premises firewall. Create a peering connection between the transit gateways.
  • B. Create a virtual private gateway in each Region. Create VPN connections from the on-premises firewall to the virtual private gateways. Configure the on-premises firewall to route the traffic between the two VPCs.
  • C. Create a virtual private gateway in each Region. Create VPN connections from the on-premises firewall to the virtual private gateways. Create a VPC peering connection between the two VPCs.
  • D. Create a virtual private gateway in each Region. Create VPN connections from the on-premises firewall to the virtual private gateways. Create a VPN connection between the virtual private gateways.
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Suggested Answer: C 🗳️
by c1193d4 at Jan. 7, 2025, 1:15 p.m.
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Nouwara
1 week, 2 days ago
Selected Answer: C
it is between A and C but as it is asked for the most cost effective so it should be C as vpc peering is less expensive than TGW
upvoted 1 times
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ashk123456
1 month, 1 week ago
Selected Answer: A
C is incorrect: VPC peering is not cost-effective for 50 TB/month because AWS charges per GB for inter-Region traffic. No centralized management: Unlike Transit Gateway, VPC Peering requires manual route table updates.
upvoted 1 times
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kaerarune
1 month, 1 week ago
Selected Answer: A
The amount of traffic between VPCs is expected to increase, while the amount of traffic between VPCs and on-premises is expected to remain constant, so wouldn't a TGW configuration be more cost-effective in the future?
upvoted 1 times
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victian
2 months ago
Selected Answer: C
actually, Inter-region TGW peering data transfer fees are higher than inter-region VPC peering data transfer fees
upvoted 1 times
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46f094c
2 months, 3 weeks ago
Selected Answer: C
Inter-region VPC peering is supported. No need to add the cost of a TGW
upvoted 1 times
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secdaddy
3 months ago
Selected Answer: A
D. AWS does not support VPN connections directly between VGWs and B. seems unlikely due to the increasing VPC-VPC traffic requirement. C. Inter-region VPC peering is not free. A. Inter-region TGW peering data transfer fees are lower than inter-region VPC peering data transfer fees.
upvoted 1 times
victian
2 months ago
actually, Inter-region TGW peering data transfer fees are higher than inter-region VPC peering data transfer fees
upvoted 2 times
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woorkim
3 months, 3 weeks ago
Selected Answer: C
Transit Gateways + VPN + TGW peering Higher base cost due to TGW hourly charges Additional data processing charges More expensive than necessary
upvoted 1 times
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kowal_001
4 months ago
Selected Answer: C
C. There is no info about extra VPCs in the future. A will work and would be better if we consider more VPCs. But it this case, we have only 2 of them , so peering is xenough.
upvoted 1 times
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c1193d4
4 months ago
Selected Answer: C
C: because it's the less expensive solution and because a 1.25 Gbps VPN is enough to transfer 10TB over 1 month (around 2h30 / 1 TB)
upvoted 1 times
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