This IDC update reviews the first-quarter 2006 revenue for Layer 2 and Layer 3 LAN switching and shows the changes from quarter to quarter and year to year. The information in this update stems from IDC's Worldwide QView service, which delivers a pivot table of end-user revenue, manufacturer revenue, and port shipments by vendor, technology, speed, configuration, port shipments, and average pricing seven weeks after the close of the calendar quarter. For more information, contact your IDC representative.