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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 155 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 155
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A real estate company is using Amazon Workspaces to provide corporate managed desktop service to its real estate agents around the world. These Workspaces are deployed in seven VPCs. Each VPC is in a different AWS Region.

According to a new requirement, the company’s cloud-hosted security information and events management (SIEM) system needs to analyze DNS queries generated by the Workspaces to identify the target domains that are connected to the Workspaces. The SIEM system supports poll and push methods for data and log collection.

Which solution should a network engineer implement to meet these requirements MOST cost-effectively?

  • A. Create VPC flow logs in each VPC that is connected to the Workspaces instances. Publish the log data to a central Amazon S3 bucket. Configure the SIEM system to poll the S3 bucket periodically.
  • B. Configure an Amazon CloudWatch agent to log all DNS requests in Amazon CloudWatch Logs. Configure a subscription filter in CloudWatch Logs. Push the logs to the SIEM system by using Amazon Kinesis Data Firehose.
  • C. Configure VPC Traffic Mirroring to copy network traffic from each Workspace and to send the traffic to the SIEM system probes for analysis.
  • D. Configure Amazon Route 53 query logging. Set the destination as an Amazon Kinesis Data Firehose delivery stream that is configured to push data to the SIEM system.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by Neo00 at July 25, 2023, 8:04 p.m.
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Neo00
Highly Voted 1 year, 6 months ago
Selected Answer: D
D https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resolver-query-logs-choosing-target-resource.html
upvoted 9 times
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46f094c
Most Recent 2 months, 1 week ago
Selected Answer: D
A- no, flow logs does not capture the DNS query itself B- no, do you imagine setting up the agent in ALL workspace instances? C- no, traffic mirror just to analyze DNS queries is an overkill D- YES, native Route53 product functionality
upvoted 1 times
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[Removed]
9 months, 2 weeks ago
To my understanding A is ruled out by https://docs.aws.amazon.com/vpc/latest/userguide/flow-logs.html#flow-logs-limitations So I would go for D
upvoted 1 times
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vikasj1in
11 months, 2 weeks ago
Selected Answer: A
Option B suggests using CloudWatch Logs, but it might result in higher costs compared to VPC Flow Logs, and the push method might introduce additional complexities and costs. Option C (Traffic Mirroring) is a powerful feature, but it may introduce additional costs and complexity, especially when considering the number of Workspaces in different VPCs and Regions. Option D involves Route 53 query logging, which may not capture all DNS queries for Workspaces, especially if they are using different DNS servers. Therefore, option A using VPC Flow Logs is the most cost-effective and straightforward solution for the given scenario.
upvoted 1 times
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Marfee400704
11 months, 2 weeks ago
I think that it's correct answer is B according to SPOTO products.
upvoted 1 times
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Arad
1 year, 2 months ago
Shouldn't it be B? The question doesn't talk about using Route53 as resolver, instead it needs to log all DNS queries made by Workspace Desktops. Maybe these Desktops are using a DNS resolver other than Route53 one. So it doesn't make more sense to configure a CloudWatch agent on desktops to gather DNS queries and send them to CloudWatch?
upvoted 1 times
Adzz
1 year, 1 month ago
Just like route 53 is not mentioned, it is nowhere mentioned that Workspace is using any custom DNS server. So it is good to assume the AmazonProvidedDNS.
upvoted 3 times
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unclehou
1 year, 4 months ago
Selected Answer: A
A is the correct answer. it says the most cost effective. S3 would be the most cost effective. While option D might work, it's not the most cost-effective or straightforward solution for capturing DNS query logs generated by Amazon Workspaces in multiple VPCs across different AWS Regions.
upvoted 3 times
Becklang
1 year, 3 months ago
you can't configure the vpc log only to log DNS querying , it would be a huge cost to enable logging for 7 vpcs while Kinesis Data Firehose First 500 TB / month $0.036 per GB
upvoted 2 times
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BasselBuzz
11 months ago
YES DNS traffic to Amazon DNS is not logged. but DNS traffic to other DNS servers is logged. according to the link provided by zendeveloper
upvoted 1 times
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zendevloper
1 year, 2 months ago
DNS traffic is not logged by flow logs https://docs.aws.amazon.com/vpc/latest/userguide/flow-logs.html#flow-logs-limitations
upvoted 1 times
near22
1 week, 3 days ago
The answer is A. AWS workspaces not use route53 DNS directly but the MSAD or Simple AD as result the DNS query will be logged in VPC flow log
upvoted 1 times
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Certified101
1 year, 5 months ago
Selected Answer: B
Wouldn't option D log all Route53 query logs from all other servers? We need to only monitor Workspaces in the this scenario - would B be correct?
upvoted 1 times
Certified101
1 year, 5 months ago
Changing to D as you can filter the resource after
upvoted 2 times
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