Det er hastigheden der er forskelllen på de typer: Her er bare et hurtigt copy paste fra wiki.
Cat 5: Currently unrecognized by TIA/EIA. Defined up to 100 MHz, and was frequently used on 100 Mbit/s Ethernet networks. May be unsuitable for 1000BASE-T gigabit ethernet.
Cat 5e: Currently defined in TIA/EIA-568-B. Defined up to 100 MHz, and is frequently used for both 100 Mbit/s and 1000BASE-T Gigabit Ethernet networks.
Cat 6: Currently defined in TIA/EIA-568-B. Defined of up to 250 MHz, more than double category 5 and 5e.
Men skal du til LAN, eller lave netværk imellen 2 computere, skal du nok op i cat. 5e kabler.
da de fleste nye bundkort har onboard 1000Mbit netkort.