Yes. Your systems connected to the switch that are gigabit-capable will speak to each other at 1000MBit/s but will negotiate down to 100MBit/s (or 10MBit/s if the device doesn't do 100) when communicating with your DSL modem/router or any other equipment that is not gigabit-capable. The exception to this truth would be if your systems or switch is configured to ONLY communicate at a certain speed and not set to auto-negotiate.
However, the default setting is always to auto-negotiate so I wouldn't worry about it. It's worth mentioning though.
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