Our school division is made up of seven schools. All schools point back to the central office location for obtaining an IP address through a central DHCP server. This process has worked flawlessly for years. All of a sudden at one of the schools, the computers are hit and miss for being able to obtain an IP address and thus connect to the server at the school and of course the Internet. I can ping the DHCP server consistently from the server at the school in question. I have replaced both network switches at this school. I have tested for network traffic that could be bringing down the network and found none. All of the other schools in the division are having no problems in this regard. I am looking for some suggestions as to what else may be causing this problem.