Some 20-odd years ago I laid a cable through my house. This backbone is a Cat5 cable. On the cable it says "Verified for gigabit".
Over the years my network has grown and I've recently started reviewing the layout and I need to make some changes (additional cabling and changing routing). This got me wondering if the old cable is still up to spec. But I have no idea how to find that out. I could take it out and replace it for a Cat5e or Cat6. But, that's quite a task.
Question 1: How do I test if the 20 years old "Cat5 verified for gigabit" cable is (still) capable of supporting my LAN at gigabit speed?
Question 2: What symptoms should I be looking out for if the cable is deteriorated?
P.S.: I have two switches (NETGEAR GS105E) in my network that allow me to test the cables, but I think this only tests for impedance and cable breaks. Not sure if those tests are useful in this case.