System.Net.ServicePointManager.DefaultConnectionLimit and .MaxServicePointIdleTime

When would you need to adjust these two settings (below)? And what do these two numbers mean for HttpWebRequest i开发者_运维知识库nstances that I make?

1. System.Net.ServicePointManager.DefaultConnectionLimit
2. System.Net.ServicePointManager.MaxServicePointIdleTime

Are ServicePoint objects specific to a domain name or each unique URI requested?

Here is a great explanation:

Understanding MaxServicePointIdleTime and DefaultConnectionLimit