A company has an application hosted in AWS. This application consists of EC2 Instances that sit behind an ELB. The following are the requirements from an administrative perspective.
a) Must be able to collect and analyze logs about ELB’s performance.
b) Ensure that notifications are sent when the latency goes beyond 10 seconds.
What should be used to achieve this requirement? (SELECT TWO)
 

Answer options:

A.Use CloudWatch for monitoring.
B.Enable VPC Flow logs and then investigate the logs whenever there is an issue.
C.Enable the logs on the ELB with Latency Alarm that sends an email and then investigate the logs whenever there is an issue.
D.Use CloudTrail to monitor whatever metrics need to be monitored.

Correct Answer – A and C
When you use CloudWatch metrics for an ELB, you can get some read requests and latency out of the box.
For more information on using CloudWatch with the ELB, please visit the following URL-
https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-cloudwatch-metrics.html
Elastic Load Balancing provides access logs that capture detailed information about requests sent to your load balancer. Each log contains information on when the request was received, the client`s IP address, latencies, request paths, and server responses. You can use these access logs to analyze traffic patterns and to troubleshoot issues.
For more information on using ELB logs, please visit the following URL-
https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/access-log-collection.html
Option B is INCORRECT because using VPC flow logs, we cannot pinpoint the issues related to ELB performance.
Option D is INCORRECT because CloudTrail is used only for monitoring API activities on AWS resources.