Win 2000 and Win95 networking

We have 3 PCs, two running Win95, and a new Dell running Win2000, coax (no hub). The win95 pcs can see and access the Win2000 PC, so cards, cables, etc. are OK, but the Win2000 PC doesn’t see anything else on the network. Is this just a config. problem, or is there a prob. with win2000 vs. win95? Protocols must be OK since the win95 systems see the win2000 system?