Hello.  I just set up my TP Wi-Fi extender.  All pretty easy.  When I looked at the app though, immediately after setting it up it shows a diagram with MAIN NETWORK > Picture of Extender >CLIENTS 1

When I click on clients is says 2.4 GHz Clients 1 = ANONYMOUS, and shows an IP address and a MAC Address.  

What is this actually showing me?  Is this a device connected to my TP Extender?  or something else?  (As apart from following the set-up instructions, I have not yet connected any of my devices to the extender network). So what is this anonymous client?

Thanks for any guidance as to what this is, and what it is showing me.