Will PiHole on Raspberry Pi Zero W slow down my internet?

[Zachnik]

Hello, for now i have Gigabit internet in my home, I plan on buying Pi Zero W. As i understeand i need to buy micro USB-B to Lan adapter and connect Pi to my router like normal PC. Does trafic go to PiHole and back to router? Or does Pihole just gets seperate info on what sites i want to access and assigns 0.0.0.0 IP to them? I plan on buying 2.5Gbit (and faster) switches so i don't want to be bottlenecked by Pi. And if I want, I can get 2Gbit internet from my ISP. 

 

On the other note, where can i learn about networking? I'm wondering about Cisco certifications but there should be great free learning materials for networking.

[Needfuldoer]

PiHole is just a dolled-up DNS server. Your devices will refer to it when looking up which IP addresses belong to which host names, but that's all. That takes very little processing horsepower on the server side.

 

Your traffic doesn't flow through PiHole because it's not a firewall.

[Kilrah]

DNS itself is really light, but pihole will do some database queries, logging etc so potentially that could have an impact on something as slow as a first gen zero.

 

If anything it won't be in the form of lower data throughput but responsiveness.