Each network, be it the ARPAnet, NSFnet or a regional network, has its own operations center. The ARPAnet is run by BBN, Inc. under contract from DARPA. Their facility is called the Network Operations Center or NOC. Cornell University temporarily operates NSFnet (called the Network Information Service Center, NISC). It goes on to the regionals having similar facilities to monitor and keep watch over the goings on of their portion of the Internet. In addition, they all should have some knowledge of what is happening to the Internet in total. If a problem comes up, it is suggested that a campus network liaison should contact the network operator to which he is directly connected. That is, if you are connected to a regional network (which is gatewayed to the NSFnet, which is connected to the ARPAnet...) and have a problem, you should contact your regional network operations center.
