Question Preventing DoS attacks by IIS dynamic IP restriction

[phungkha]

Server operating system version

Windows

Plesk version and microupdate number

Version 18.0.44

Hi There,
I am trying to figure out the best values for my server to prevent DOS attacks by IIS dynamic IP restriction as shown in the article (https://support.plesk.com/hc/en-us/...inst-DDoS-attacks-in-Plesk-for-Windows-Server). Is the Default value good enough? if not how to calculate the best value or understand the process?
The following are the two options with a default value

1. Deny IP Addresses based on the number of Concurrent requests from a unique IP Address
   • Maximum number of concurrent requests = 5
2. Deny IP Addresses based on the number of requests over a period of time
   • Maximum number of requests = 20
   • Time Period (In Millisecond) = 200

In the concurrent request, does the image, and page also counted as a request what I mean is if my site contains 6 images.
Very confusing Please help me understand with this calculation