The Internet is literally a network of networks, and it’s bound together by BGP. BGP allows one network (say Facebook) to advertise its presence to other networks that form the Internet. As we write Facebook is not advertising its presence, ISPs and other networks can’t find Facebook’s network and so it is unavailable.
Article on How to Fix DNS_PROBE_FINISHED_NXDOMAIN.
In my case it was an issue due to the network outage. I checked the LOS and internet LEDs. Found LOS on and internet off. Contacted my Broadcom service provider and they fixed the issue. But initially I was not suspecting my internet and read this article. It was a good information to share.