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This appendix provides further explanation of concepts related to the switch. It also provides information on how to use the switch in your network.
Each switch port can operate in either half-duplex or full-duplex mode. As shown in Figure A-1, when port 1 is in half-duplex mode, at a given time, it can either send data to port 2 or receive data from port 2. When port 1 is in full-duplex mode, it can simultaneously send data to port 2 and receive data from port 2, doubling the throughput between ports 1 and 2.
You cannot disable the autonegotiation of speed and duplex mode on the switch.
The switch has the following operating priorities:
For example, if the switch is connected to a Cisco 1528 Micro Hub 10/100, upon startup, the switch and the hub communicate the following capabilities to each other:
Because both devices can run at either 100 and 10 Mbps, 100 Mbps is chosen because it is the highest priority for both switch and hub. Because the hub can run only in half-duplex mode, half-duplex mode is chosen.
In the previous example, both the switch and the hub are capable of autonegotiation. However, if the switch is connected to a device that is not capable of autonegotiation, the switch will do the following:
However, if the nonautonegotiating device connected to the switch can run in full-duplex mode, the following might occur:
To prevent either of these situations from occurring, Cisco recommends that you set the duplex mode on the nonautonegotiating device to half-duplex mode.
This section describes two common examples of how you can use the switch:
You can build a network for your small business or workgroup by using a switch and other network devices such as a router, PCs, or workstations. Figure A-2 shows an example of such a network.
You can build a network backbone for your small business or workgroup by using a switch and other network devices such as a router, a server, hubs, PCs, and workstations. Figure A-3 shows an example of such a network.
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