I'm new to the different Cisco products and was wondering what the differences are between these three products? Each product seems a bit similar, but maybe that's not the case. Some clearer explanation to what each of the products are and what they do and how they differ from one another would be much appreciated for this beginner.
ISE is a AAA server based on RADIUS & TACACS protocols for doing network access control (NAC) of endpoints at your network access edge (wired, wireless, VPN).
Umbrella is a DNS service for all of your network endpoints to use and block them from certain categories of sites (gambling, porn, etc.) or known malicious sites on the Internet in case your users click on misleading or phishing links.
Stealthwatch is a network analytics tool that principally uses NetFlow to develop a network behavior baseline of endpoint groups that talk to other endpoint groups then alert you to behavioral anomalies (exfiltration, hoarding, command and control, etc.).
I recommend watching free, introductory-level Cisco Live on-demand library of session recordings to learn more about these products and how they work.
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