In a computer lab some computers with Ethernet nics are connected to an Ethernet hub by cat-5 cables and some computers have an 802.11 network card there is an 802.11 access point which is also co?

I think I can answer your question -- once you ask it. 802.11 is a wireless ethernet protocol, there are currently 3 subtypes; a, b and g. In order to have any computers or laptops connected to the same network, the wireless access point would need to be plugged into the ethernet hub. Unless the wireless network is subnetted, i.e. the wireless access point provides the IP addresses for its client computers, the WAN port on the wireless access point may not be used. The AP may be connected in client mode, i.e. connected via a LAN port and not the WAN port, bypassing the internal router, if one exists on your model AP. This allows the wirelessly connected computers to get their IP addresses from the network DHCP server. Perhaps this may already have answered your question(s)!