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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 24 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 24
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has deployed Amazon EC2 instances in private subnets in a VPC. The EC2 instances must initiate any requests that leave the VPC, including requests to the company's on-premises data center over an AWS Direct Connect connection. No resources outside the VPC can be allowed to open communications directly to the EC2 instances.
The on-premises data center's customer gateway is configured with a stateful firewall device that filters for incoming and outgoing requests to and from multiple VPCs. In addition, the company wants to use a single IP match rule to allow all the communications from the EC2 instances to its data center from a single IP address.
Which solution will meet these requirements with the LEAST amount of operational overhead?

  • A. Create a VPN connection over the Direct Connect connection by using the on-premises firewall. Use the firewall to block all traffic from on premises to AWS. Allow a stateful connection from the EC2 instances to initiate the requests.
  • B. Configure the on-premises firewall to filter all requests from the on-premises network to the EC2 instances. Allow a stateful connection if the EC2 instances in the VPC initiate the traffic.
  • C. Deploy a NAT gateway into a private subnet in the VPC where the EC2 instances are deployed. Specify the NAT gateway type as private. Configure the on-premises firewall to allow connections from the IP address that is assigned to the NAT gateway.
  • D. Deploy a NAT instance into a private subnet in the VPC where the EC2 instances are deployed. Configure the on-premises firewall to allow connections from the IP address that is assigned to the NAT instance.
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Suggested Answer: C 🗳️
by zaazanuna at March 18, 2023, 9:59 p.m.
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Cappy46789
Highly Voted 1 year, 5 months ago
Selected Answer: C
C - you need a NAT https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html
upvoted 7 times
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RavikantKumarRavi
Most Recent 1 month, 3 weeks ago
Selected Answer: D
NAT Gateway never host inside Private subnet
upvoted 1 times
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Raphaello
4 months, 2 weeks ago
Selected Answer: C
Correct answer is C, private NAT Gw.
upvoted 1 times
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Marfee400704
6 months, 1 week ago
I think that it'sanswer is C according to SPOTO products.
upvoted 1 times
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marfee
6 months, 2 weeks ago
I think that it's correcty answer is C.
upvoted 1 times
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Arad
10 months ago
Selected Answer: C
Definitely C.
upvoted 1 times
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habros
10 months, 1 week ago
Selected Answer: C
It is C. Why? NAT Gateway is managed, hence it is LEAST operational effort. Not D. Why? NAT Instance is self-managed, self-patched.
upvoted 2 times
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Mandar
1 year, 4 months ago
Answer C) https://docs.aws.amazon.com/whitepapers/latest/building-scalable-secure-multi-vpc-network-infrastructure/private-nat-gateway.html
upvoted 2 times
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ITgeek
1 year, 4 months ago
Selected Answer: C
C is correct as a NAT gateway is already a service vs a NAT instance is just another EC2 with more overhead
upvoted 4 times
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awsguru1998
1 year, 4 months ago
D is the correct answer because it suggests deploying a NAT instance in a private subnet. The NAT instance can then be used to allow outbound traffic from the EC2 instances in the private subnet to the on-premises data center, while also blocking all incoming traffic from the data center to the EC2 instances.
upvoted 2 times
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flowers00
1 year, 5 months ago
C - correct.
upvoted 3 times
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zaazanuna
1 year, 5 months ago
B - correct. The solution that meets the requirements with the LEAST amount of operational overhead is option B: Configure the on-premises firewall to filter all requests from the on-premises network to the EC2 instances. Allow a stateful connection if the EC2 instances in the VPC initiate the traffic.
upvoted 2 times
Cappy46789
1 year, 5 months ago
The EC2 insrance need to use the same IP when they hit onpremise, which means you need a NAT so C is correct
upvoted 2 times
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