I've not had a router before & am seeing conflicting & confusing info on ethernet cable types. Currently it's set up w/ a UTP patch Cat5 ethernet cable I already had w/ the Cable Modem & an STP patch Cat5e ethernet cable that came with router & everything works fine. I need to get another ethernet cable to go from router to PC2.
Near as I can surmise optimally I would buy an STP Cat5e patch cable. I thought patch & crossover were 2 different types but then I've seen them sold as crossover patch cables as if they're the same (??).
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Buy 2 more STP Cat5e cables so they'll all be capable of the same speeds. PC1 has Gigabit (10/100/1000) port but PC2 (probably) doesn't (just 10/100).
You just need standard CAT5e cables. Even gigabit over CAT5e is fine unless you have VERY long runs. They used to make crossover cables (perhaps still do), but they've pretty much been made obsolete. Most any modern NIC supports auto-sensing MDIX and will automatically configure itself appropriately (either straight-thru or crossover) using standard ethernet cables.