If you use Network Printing devices you have to check wath protocols you need to access that printer.
Standard Network protocols on HP Printdevices are:
Use only the ones that your really need!
If you run a TCP/IPBased network without Apple Computers or Novell Clients just set the TCP/IP Stack.
Disbale all the others so they don’t send all kinds of network packets over your network.
Always try to keep your network as clean as possible..