Ignore the erroneous answer that Cat 8 is a marketing gimmick. As noted by someone else, Cat 8 is rated for 40Gbps/2000Mhz which most people, especially home users, cannot utilize at this time. If you want to future proof your wiring, get Cat 8 but at the speeds you mention, a decent shielded Cat 5e or Cat 6 or 6a will work just fine. You'll see no speed boost just from a "faster" cable. Avoid Cat 7 and 7A due to finicky proprietary connector issues.

Does this have to plug into the router or can it plug into a Wifi extender?

If your wifi extender is set to allow connections to your main access point via the Ethernet port, then yes. It will work just like any other Ethernet cable. If you have tried a different cable and it did not work, your extender is either not setup properly to allow this or it is not capable of it.

ASIN	B0BKVHLRSJ
Best Sellers Rank	#508 in Ethernet Cables
Brand	DbillionDa
Cable Type	Ethernet
Color	Black
Compatible Devices	Any device with an RJ45 port, including Monitor, Patch Panels, Switches, Laptop, Scanner, Tablet, Notebooks, PCs, Network Cards, Macs, PoE Devices, Routers, Modems, Printer Smart Watch, Splitters, PS3, PS4, PS5, Server, Projector, DVD Player
Compatible Phone Models	VoIP phones
Connector Gender	Male-to-Male
Connector Type	RJ45
Customer Reviews	4.6 4.6 out of 5 stars (552)
Data Transfer Rate	40 Gigabits Per Second
Date First Available	October 29, 2022
Ethernet cable category	Cat 8
Frequency	2000 MHz
Indoor/Outdoor Usage	Indoor, Outdoor
Item Weight	0.8 ounces
Item model number	cat8 1.5ft etheret cable
Manufacturer	DbillionDa
Number of Items	1
Number of Pins	8
Outer Material	Polyvinyl Chloride (PVC)
Package Dimensions	5.55 x 5.51 x 0.75 inches
Recommended Uses For Product	Outdoor&Indoor
Shape	Round
Special Feature	Heat Resistant/ High Speed/ UV Resistant/ Water Resistant/ Waterproof/ Weatherproof
Unit Count	1 Count

Cat8 Ethernet Cable, Outdoor&Indoor, 1.5FT Heavy Duty High Speed 26AWG Cat8 LAN Network Cable 40Gbps, 2000Mhz with Gold Plated RJ45 Connector, Weatherproof S/FTP UV Resistant for Router/Gaming/Modem

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