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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 157 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 157
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company uses multiple AWS accounts and VPCs in a single AWS Region. The company must log all network traffic for Amazon EC2 instances and Amazon RDS databases. The company will use the log information to monitor and identify traffic flows in the event of a security incident. The information must be retained for 12 months but will be accessed infrequently after the first 90 days. The company must be able to view metadata that includes the vpc-id, subnet-id: and tcp-flags fields.

Which solution will meet these requirements at the LOWEST cost?

  • A. Configure VPC flow logs with the default fields Store the logs in Amazon CloudWatch Logs.
  • B. Configure Traffic Mirroring on all AWS resources to point to a Network Load Balancer that will send the mirrored traffic to monitoring instances.
  • C. Configure VPC flow logs with additional custom format fields Store the logs in Amazon S3.
  • D. Configure VPC flow logs with additional custom format fields Store the logs in Amazon CloudWatch Logs.
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Suggested Answer: C 🗳️
by ISSDoksim at July 27, 2023, 9:29 a.m.
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Certified101
Highly Voted 5 months, 3 weeks ago
Selected Answer: C
The other options are less cost-effective: Option A does not allow you to capture the custom fields you need (vpc-id, subnet-id, and tcp-flags). Option B, Traffic Mirroring, would involve a considerable overhead in terms of infrastructure and cost. Traffic Mirroring copies all traffic (not just metadata), which can be massive, and it requires additional resources to capture and process that traffic. Option D is less cost-effective for long-term, infrequently accessed storage because Amazon CloudWatch Logs is more expensive than Amazon S3 for these use cases.
upvoted 6 times
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AzureDP900
Most Recent 3 weeks, 6 days ago
Option C is actually the most cost-effective solution. By configuring VPC flow logs with additional custom format fields, the logs will be stored in Amazon S3, which has a lower storage cost compared to Amazon CloudWatch Logs. This option also allows for more flexibility and control over the log data, as well as the ability to easily access and filter the logs using AWS CLI or SDKs.
upvoted 1 times
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woorkim
1 month, 2 weeks ago
Selected Answer: C
S3 is more cost effective!
upvoted 1 times
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ISSDoksim
6 months ago
C. https://docs.aws.amazon.com/vpc/latest/userguide/flow-logs.html#flow-logs-custom
upvoted 1 times
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