Cat5 cables were the best option for wired networking (also called Ethernet) for a long time. But since the release of Cat6, that's changed. Cat6 is now considered the minimum standard for networking, ...
If you are cabling for 1000BT, you want CAT5e at a minimum. CAT 5 does not do gigabit as part of the spec. CAT6 just gives you more bandwidth, but there are no Ethernet standards that require it yet.
Cat5 may still be an option, but Cat6 is faster, safer, and more durable Cat5 cables were the best option for wired networking (also called Ethernet) for a long time. But since the release of Cat6, ...