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ANS-C01: Meeting 12 Month Network Traffic Logging Needs on AWS with Low-Cost VPC Flow Logs to S3 Archival Storage

Learn how to reduce networking monitoring costs on AWS by configuring VPC flow logs with custom metadata sent to durable yet low-cost S3 for long-term log retention.

Table of Contents

Question

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.

Answer

C. Configure VPC flow logs with additional custom format fields Store the logs in Amazon S3.

Explanation

This is the most cost effective solution because:

  • S3 provides low cost archival storage for 12+ months retention needed
  • VPC flow logs contain needed metadata fields without extra processing
  • Custom fields allow viewing vpc-id, subnet-id, tcp-flags as required

Compared to other options:

A – Cannot view required custom fields
B – Traffic Mirroring has network performance/cost overhead
D – CloudWatch Logs has higher costs for 12+ months retention needed

By leveraging VPC flow logs with custom fields to S3, all requirements are met at the lowest storage cost over the long retention period needed.

AWS Certified Advanced Networking – Specialty ANS-C01 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the AWS Certified Advanced Networking – Specialty ANS-C01 exam and earn AWS Certified Advanced Networking – Specialty ANS-C01 certification.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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