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Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 85 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02
Question #: 85
Topic #: 1
[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A company has created a VPC with multiple private subnets in multiple Availability Zones (AZs) and one public subnet in one of the AZs. The public subnet is used to launch a NAT gateway. There are instances in the private subnets that use a NAT gateway to connect to the internet. In case of an AZ failure, the company wants to ensure that the instances are not all experiencing internet connectivity issues and that there is a backup plan ready.
Which solution should a solutions architect recommend that is MOST highly available?

  • A. Create a new public subnet with a NAT gateway in the same AZ. Distribute the traffic between the two NAT gateways.
  • B. Create an Amazon EC2 NAT instance in a new public subnet. Distribute the traffic between the NAT gateway and the NAT instance.
  • C. Create public subnets in each AZ and launch a NAT gateway in each subnet. Configure the traffic from the private subnets in each AZ to the respective NAT gateway.
  • D. Create an Amazon EC2 NAT instance in the same public subnet. Replace the NAT gateway with the NAT instance and associate the instance with an Auto Scaling group with an appropriate scaling policy.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by MPSaws at Aug. 9, 2020, 7:30 p.m.
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MPSaws
Highly Voted 3 years, 8 months ago
I agree C
upvoted 56 times
aguy9
3 years, 7 months ago
I agree, the answer is C
upvoted 4 times
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Paitan
Highly Voted 3 years, 8 months ago
The correct option is Nat gateways in different public subnets across AZ.
upvoted 10 times
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mfaktas
Most Recent 1 year, 6 months ago
Selected Answer: C
Using the same AZ doesnt make sense sice you are searching a solution to overcome the AZ failure. So its obviously C which is the only option giving multi AZ option.
upvoted 1 times
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bora4motion
2 years, 10 months ago
Selected Answer: C
AWS no longer recommends using NAT Instances. For every NAT question I go for NAT GW. In order to have NAT public>private you need public IP and NAT GW.
upvoted 4 times
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xyzray
3 years, 5 months ago
Selected Answer: C
We are all fine with A. But if we go with D the reply will be blocked by the SG. For me is A+C
upvoted 1 times
xyzray
3 years, 5 months ago
wrong post...
upvoted 1 times
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gargaditya
3 years, 6 months ago
C. NAT GW HA concept: -NAT Gateway is resilient within a single-AZ -Must create multiple NATGateway in multiple AZ for fault-tolerance -There is no cross AZ failover needed because if an AZ goes down it doesn't need NAT (if an AZ goes down, all ec2 in that AZ will also be down No point connecting ec2 in one AZ with NAT GW in other AZ) So associate within each AZ: have the RT of private subnet point to corresponding (same AZ) NAT GW/instance located in public subnet
upvoted 9 times
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kdhondge
3 years, 7 months ago
NAT gateways are highly available than instances. So not B & D https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-comparison.html Tie bet'n A & C. A looks good but C provide more HA than A , and that is what question asks MOST highly available
upvoted 5 times
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woke
3 years, 7 months ago
C is correct
upvoted 4 times
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nickname20212021
3 years, 7 months ago
Passed the exam on 26th June, this question was on my test.
upvoted 5 times
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elrmel
3 years, 7 months ago
My answer is C, also.
upvoted 2 times
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syu31svc
3 years, 7 months ago
C for correct
upvoted 2 times
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KK_uniq
3 years, 7 months ago
C for sure
upvoted 2 times
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mryala
3 years, 7 months ago
it's C
upvoted 1 times
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Ankitrathi85
3 years, 7 months ago
C right
upvoted 1 times
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dasalas
3 years, 7 months ago
Hello, I don´t knos why is C, because the statement says that just one instance need to have access to internet instead of many, Could someone explain this to me please?
upvoted 1 times
seasky
3 years, 7 months ago
A new public subnet for NAT Gw per AZ. private subnets pre existing so per AZ, the public & private subnet connection will be easy to configure in route table + going 1 AZ down(=HA need) won't let application go busted
upvoted 2 times
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AEN
3 years, 7 months ago
Ans is C
upvoted 1 times
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Elias23
3 years, 7 months ago
CCCCCCCCCCCCCCCCCCC
upvoted 1 times
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C (25%)
B (20%)
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