ocr: Figure la-centralized Archilectore Figure luy Distributed Architectore * a - - eseret O0e -s osver avRere es sercet cusiserre Hovng de0e eacdrces PRRENE hore Lorsatiste CSSNstON atelton RMSOR % 1 - Figure 1 This depiction of centralized yS. distributed LAN architectures shows a typical shift that occurs when communication needs and/or types of traffic change. In Figure la, a centralized structure based on Permanent Virtual Circuits (PVCS) is sufficient: to satisfy the needs of the net- work. As more applications are added, however, Switched Virtual Circuits (SVCS) help provide the additional f ...