Question about how wireless networks work

Hello,
This is more of a general question rather than one that is specific to the airport. I have a network with an Airport Express with wireless n, a Macbook Pro with a wireless n card, and a printer that has a wireless g card. Someone told me that because I have a wireless g device on my network that I will never get wireless n speeds even when using my computer to do things besides printing because the network is only as fast as its slowest device. Based on this, if there is a computer on my network that has a wireless g card then everyone on the network can only get wireless g speeds even if the others have wireless n cards.
It was always my understanding that I could not get n speeds when using the printer but I thought that if I were using my computer to connect to the internet, download, upload, etc. (things that have nothing to do with printing and don't require the printer) then I should be able to get wireless n speeds.
I was wondering if someone could explain how wireless networks work. Thanks in advance.

The simple answer is that having 802.11g (i.e. 54 Mbit/s) clients on an 802.11n network will NOT slow down the 802.11n clients.
However, 802.11g works only in the 2.4 GHz band, whereas 802.11n also works in the 5 GHz band, which is potentially much faster. So if you require compatibility with g devices on an AirPort Express, it decreases the potential maximum speed of the n devices, because you have to operate in the 2.4 GHz band. But this slowdown occurs whether or not g devices are actually connected to the network.

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