Yes you can! I expanded my AT&T U-Verse Gateway router ( a 2 Wire product) by adding a Netgear 4 port switch. then, I connected an Ethernet cable from the AT&T Gateway into a port on the 4 port Netgear switch (I used port # 1, but it doesn't matter which port you select for the incoming Ethernet cable.) This added three additional ports to the AT&T Gateway router allowing me to connect a wireless security router that's now available for access through the internet because it's powered by the AT&T Gateway. The process was seamless with no glitches or software requirements.
We've had good luck with the 8 port metal trendnet switch. (I forget the model number). It has a nice dual voltage adapter. I'm not sure about m GS108 as it died after less than a year (look at the 1 star reviews, they had a major QC problem a few years ago).