If you want a good network setup with good coverage and fast speeds, you really need to get a good network technician to set 1 up, and that's not someone from the Geek Squad or any of the xfinity/spectrum/att vendors, these guys are normally clueless. I was doing large enterprise networks in the late 80's.
Don't expect to get the best modem/router from xfinity and get say 400Mb from anywhere in your house on every device unless you do it right. Every wall/ceiling you go thru you lose signal strength, every device (Ecobee, garage doors, direct tv receiver, peacock receiver, iPhone, iPad, etc...) either use the 2.4ghz/5ghz/6ghz network bands, and when to setup ipv4 and ipv6.
Also, you have 3 networks, 1 wired to the internet, 1 wired internal network, and 1 wireless network. Xfinity/spectrum/att/or any other IP will state their speeds at the wired location coming into the house at the modem/router. So if you want to test the maximum internet speed, hook up a laptop with a ethernet cat5e or better cable to the modem/router and do a network speed test. The internal wired network can be any speeds from 10Mb to 10Gb or higher depending on network setup and equipment and setup. Then you have your internal wireless network which can vary in speeds from 10Mb to over 1Gb depending on equipment and setup.
I use a mixture of the Xfinity modem/router and another pair of mesh routers (wired bridge using wifi 6E) in my house and I get close to 1Gb wireless speeds from my iPhones and iPads, and all my home automation gear inside and outside gets great coverage and speeds.
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