ocr: 18M3090 Amdant San Francisco Tokyo MAINFRAME (MVS, VMS) Federated Application VAX11780 HP.9000 HongKong London MINICOMPUTEHS (VAX, Unix) A broak in one node wil not ellect 1h8 overall Ethernel Novell New York Pans PC Notworks (DOS, OS/2) FIGURE 2. Multiple points of failure.