No I do not have any spare RJ45 networking cables which I can use as backup cables. But, I can always go to my local electronics store like Bestbuy or department store like Wal-Mart to buy a new network cable when needed.
Kind of, I think I got one floating around somewhere. I do keep backup HDMI cables though.
There are newer HDMI cable which have an Ethernet connection in the HDMI cable. Cutting the metal plugs off, and lining up the Ethernet wires inside of the HDMI cables correctly with the correct wire slots inside the plastic RJ45 plug can create a Ethernet cable after using a Ethernet Crimper/pressing tool to press the wires securely together will create a ethernet cable.
how does having internet within the hdmi work?