Hi All, I wanted to say hello as this is my first post.
With Cloudflare using the 1.1.1.1 for DNS lookups, make sure you and your company as well as training guides that have 1.1.1.1 in the examples for loopbacks or other configurations that used to be default (like the Cisco WLC) are updated.
https://www.cloudflare.com/learning/dns/what-is-1.1.1.1/