Is it worth installing Quad 9, or does it merely double up on a Norton feature?
You don't install Quad9 DNS, you just change your DNS settings in either your router of on your machine.
I believe it is a great free service and it doesn't track you like some DNS services. The only problem is for me living in Australia it is quite slow, but that is a fault with my ISP, not Quad9.
Try it out and if you don't notice any speed issues stick with it. No problem having a layered protection.
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