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A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.
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Now for Linksys you need a different cable (usually comes with it, and it's light cream color) and it has DB9 on both ends.
Remember it's the serial port of your laptop, and if your laptop does not have a serial port then either get an older laptop, use a desktop PC or grab one of those Serial-to-USB adapters