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A network switch is a multiport network bridge that uses MAC addresses to forward data at the data link layer (layer 2) of the OSI model. Some switches can also forward data at the network layer (layer 3) by additionally incorporating routing functionality. Such switches are commonly known as layer-3 switches or multilayer switches. [2]
Switching uses different kinds of network switches. A standard switch is known as a layer-2 switch and is commonly found in nearly any LAN. Layer-3 or layer-4 switches require advanced technology (see managed switch) and are more expensive and thus are usually only found in larger LANs or in special network environments.
The PowerConnect 6024F was a 24 port, layer 3, all-Gigabit, fiber-optimized switch. It had 24 SFP ports, eight of which doubled as copper ports. This switch was capable of routing, with static routes, Routing Information Protocol (RIP), and Open Shortest Path First (OSPF). It was replaced by the PowerConnect 6224/6248 models.
Switch 4200G - Gigabit. 12, 24 or 48 Gb ports including 4 Dual Personality Ports (2 × Gb or SFPs). 12-Port module has one 10-Gigabit expansion slot; other units have two 10-Gigabit expansion slots. One PoE model. Units can directly take a 10GE XENPAK, or can receive a 1-Port 10GE XFP module. Supports Layer 2 switching and Layer 3 static routing.
Switching loops can cause misleading entries in a switch's media access control (MAC) database and can cause endless unicast frames to be broadcast throughout the network. A loop can make a switch receive the same broadcast frames on two different ports, and alternatingly associate the sending MAC address with the one or the other port.
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The inside of a Cisco 1900-series switch. Catalyst is the brand for a variety of network switches, wireless controllers, and wireless access points sold by Cisco Systems.While commonly associated with Ethernet switches, a number of different types of network interfaces have been available throughout the history of the brand.
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