Hi,you must use the cross-over cable for connect the switch to switch.pc to sw = straightrouter to router = cross-overrouter to pc = cross-over in the newst 2950 switches isl dont support and default encapsulation is dot1.q and this command isnt req...
This problem can accoured in following situatin:1.The tftp server is unreachable.2.Dont run tftp server software.3.The tftp port in the firewall is closed.4. The tftp server configuration in transmit only and you must change to transmit and recive.5....