Unpack the "dotnetfx.exe" with the /C /T:pathname. Youy'll get 5 files :
install.exe
instmsi.exe
instmsiw.exe
netfx1.cab
netfx.msi

If workstations are up to date with Windows Installer, install.exe and instmsix.exe are unusefull.
You can install the framework with the following commandline :
MSIEXEC.EXE /I netfx.msi /qb!

I used this method recently to deploy the framework over 3000 wortkstations.
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Christophe