I have a problem with a 2950 switch with 48 ports. In the first group of ports (1 to 16) there are no problems. If I connect my laptop to a port of the second or third group, port looks to be connected, but I can't ping pcs on the ports of the 1st group on the same vlan. Then, I can't ping pcs of the first group from another switch . Port in trunking mode is the 48 one, in the 3rd group. Do you think there is an hardware problem?