depends a lot on your network. and do you need this to be a stand alone router, or is it an integrated modem/router?
if it's a stand alone router, most will handle the job. if it's an integrated device, it depends on the technology. I use a Motorola Surfboard at gigabit to the LAN, but it's not needed on my 30 megabits connection.
100 versus 101 megabit isn't going to be a problem IMO. You will almost never peg the connection anyway.
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