Table of Contents In This Update Situation OverviewVendor HighlightsLearn More Related ResearchDefinitionsLayer 2Layer 3Layers 4–7MethodologyTable: Worldwide Ethernet Switch Revenue by Vendor, 1Q08, 4Q08, and 1Q09 Table: Worldwide Gigabit Ethernet Switch Revenue by Vendor, 1Q08, 4Q08, and 1Q09 Figure: Worldwide 10GbE Port Shipments, 1Q04–1Q09