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A network switch is a computer networking device that links network segments or network devices. The term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model. Switches that additionally process data at the network layer (layer 3) and above are often called layer-3 switches or multilayer switches. A network switch is made up of network switch components.

Cisco WS-X4920-GB-RJ45=, 銀, Catalyst 4900M, 1 Gbit/秒, 有線, Ethernet, Fast Ethernet, Gigabit Ethernet, 188 x 209 x 49 mm

Cisco WS-X4920-GB-RJ45=. 產品色彩: 銀, 相容性: Catalyst 4900M. 數據傳輸速率: 1 Gbit/秒, 連接方式: 有線, 網路介面: Ethernet, Fast Ethernet, Gigabit Ethernet. 尺寸（寬x深x高）: 188 x 209 x 49 mm, 重量: 700 g. 相容操作系統: Cisco IOS

WS-X4920-GB-RJ45=

Cisco WS-X4920-GB-RJ45= 網路交換元件