DAA files are images of CD or DVDs stored in a proprietary format, so there’s no “out-of-the-box” solution from your favourite Linux shell.
You have to download PowerISO, a software famous for its Windows incarnation but available also for Linux from their website. Download the package into a suitable directory, expand it and run the program contained as described in third line:
wget http://poweriso.com/poweriso-1.3.tar.gz tar xfz poweriso-1.3.tar.gz ./poweriso convert "yourfile.daa" -o outputfile.iso -ot iso
Then to mount .iso file, Linux can do it for you:
mount -o loop yourfile.iso /your/folder