A user has configured an ELB to distribute the traffic

among multiple instances. The user instances are facing some issues due to the back-end servers. Which of the below mentioned CloudWatch metrics helps the user understand the issue with the instances?

A. HTTPCode_Backend_3XX

B. HTTPCode_Backend_4XX

C. HTT

PCode_Backend_2XX

D. HTTPCode_Backend_5XX

Explanation:

CloudWatch is used to monitor AWS as well as the custom services. For ELB, CloudWatch provides various metrics including error code by ELB as well as by back-end servers (instances). It

gives data for the count of the number of HTTP response codes generated by the back-end instances. This metric does not include any response codes generated by the load balancer. These metrics are:

The 2XX class status codes represents successful actions

T

he 3XX class status code indicates that the user agent requires action

The 4XX class status code represents client errors

The 5XX class status code represents back-end server errors