You are working for an electrical appliance company that has a web-application hosted in AWS. This is a two-tier web application with web-servers hosted in VPC’s & on-premise data-center.You are using a Network Load balancer in the front end to distribute traffic between these servers. You are using instance Id for configuring targets for Network Load Balancer. Some clients are complaining about the delay in accessing this website.
To troubleshoot this issue, you are looking for a list of Client IP address having longer TLS handshake time. You have enabled access logging on Network Load balancing with logs saved in Amazon S3 buckets. Which tool could be used to quickly analyze many log files without any visualization in a cost-effective way?

Answer options:

A.Use Amazon Athena to query logs saved in Amazon S3 buckets.
B.Use Amazon S3 console to process logs.
C.Export Network Load Balancer access logs to third-party application.
D.Use Amazon Athena along with Amazon QuickSight to query logs saved in Amazon S3 buckets.

Correct Answer – A
Amazon Athena is a suitable tool for querying Network Load Balancers logs. In the above case, since a large amount of logs are saved in S3 buckets from the Network load balancer, Amazon Athena can be used to query logs and generate required details of client IP address and TLS handshake time.
Option B is incorrect as processing many logs directly from the S3 console will be a time-consuming process.
Option C is incorrect as using a third-party tool will not be a cost-effective solution.
Option D is incorrect as in the above case, we require only details of Client IP details along with TLS handshake time for troubleshooting purposes. Amazon QuickSight will be useful in case you need data visualization.
For more information on using Amazon Athena to query Network Load Balancer logs, refer to the following URL-
 https://docs.aws.amazon.com/athena/latest/ug/networkloadbalancer-classic-logs.html