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The connector (8P8C modular) is the same.
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Cat6: <a href="http://compnetworking.about.com/od/cat5cables/l/bldef_cat6.htm" rel="ugc">http://compnetworking.about.com/od/cat5cables/l/bldef_cat6.htm</a><br />
Cat5: <a href="http://compnetworking.about.com/od/cat5cables/l/bldef_cat5.htm" rel="ugc">http://compnetworking.about.com/od/cat5cables/l/bldef_cat5.htm</a><br />
RJ45: <a href="http://compnetworking.about.com/od/networkcables/g/bldef_rj45.htm" rel="ugc">http://compnetworking.about.com/od/networkcables/g/bldef_rj45.htm</a>
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Some rj45 plugs are labelled as cat5 or cat6. I thought that cat5 and cat6 referred to the tightness of the twist in the cable. Is this just marketing or is there actually a difference between cat5 and cat6 rj45 plugs?
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Some rj45 plugs are labelled as cat5 or cat6. I thought that cat5 and cat6 referred to the tightness of the twist in the cable. Is this just marketing or is there actually a difference between cat5 and cat6 rj45 plugs?

The connector (8P8C modular) is the same.

Cat6: http://compnetworking.about.com/od/cat5cables/l/bldef_cat6.htm
Cat5: http://compnetworking.about.com/od/cat5cables/l/bldef_cat5.htm
RJ45: http://compnetworking.about.com/od/networkcables/g/bldef_rj45.htm

Is there actually a difference between rj45 plugs labelled as cat5 and cat6?

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.