@BobMccue1 A router integrated Speedtest is being executed from the router itself, not from the device (laptop) that you're initiating the test.

@TWillus TL-SG108 is simple 8-port unmanaged switch - it's plug and play device: Check your cabling - use a different cable or a different port on the switch.

@Shebee If you want to use your C1900 to extend your AX11000 wireless coverage you probably want to use C1900 in AP mode - details (Case 2). if it's about connecting C1900 wirelessly to AX11000 using...

@AJNetwork IoT and Gest network are wireless SSIDs in the router so only wireless devices could be associated with these two. When plugging a device by an etehrnet cable to your router it directly...

@pascalsm RE305 ethernet port is just 100 mbps capable thus a bottleneck of 100 mbps when in AP mode.

@joshforester In general all Deco models are compatible with each other - check this FAQ.