What should users expect when accessing information? At what point does service begin to degrade?
How much bandwidth is actually available? What is the impact when under load or attack?
Are new users able to connect? How fast can new connections be established when existing users are stressing the system?
Are threats being caught? How much does the system slow down when additional security is implemented?
Constantly monitor TCP throughput, set a threshold for acceptable levels of performance, and discover network boundaries and limitations.
How much can your website handle? Do customers abandon their cart when the site takes too long to load?