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It hears an electrical signal on the wire and passes it along to the other ports.Ī switch can physically replace a hub in your network. In terms of the OSI model, a hub is considered a layer-one (physical layer) device. A 100Mb hub shares 100Mb of bandwidth among the connected devices. If it is a 10Mb hub, and there are 6 devices connected to 6 different ports on the hub, all six devices share the 10Mb of bandwidth with each other. The devices on that segment share the bandwidth with each other. A hub allows multiple devices to be connected to the same network segment. Hubs and Switchesīecause of the great demand placed on local area networks, we have seen a shift from a shared bandwidth network, with hubs and coaxial cable, to a dedicated bandwidth network, with switches.

These paragraphs describe some of the key concepts to know about switches. Switches have become much more complex over the last few years because they have gained in popularity and sophistication. One of the prerequisites to troubleshooting any device is to know the rules under which it operates. If you are new to LAN switching, these sections take you through some of the main concepts related to switches. Refer to Cisco Technical Tips Conventions for more information on document conventions. There are no specific requirements for this document. Using Portfast and other commands to fix end-station startup connectivity problemsĬonfiguring and troubleshooting multilayer switching ISL trunking on Catalyst 50 family switchesĬonfiguring and troubleshooting EtherChannel switch to switch Troubleshooting Ethernet 10/100Mb half/full duplex auto-negotiation Troubleshooting port connectivity problems General switch troubleshooting suggestions The sections in this chapter describe common LAN switch features and solutions to some of the most common LAN switching problems.

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