Why You Might Not Want To Join Two Ethernet Cables (And What You Should Do Instead)
Extending your Ethernet cables by using a coupler isn't the worst idea, but sometimes it can be easier to replace it with a longer cord or buy a network switch.
Via Engadget

Longer cables or a network switch could save you a lot of hassle.
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Move your desk a few feet and you may find that the perfectly good Ethernet cable that once easily connected your computer is now too short. If you happen to have a second Ethernet cable close by, a small RJ45 coupler will allow you to connect them together with little effort. There's no need to find an outlet for power, read through a setup guide…
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