protecting a subdomain that is within my wordpress network, but hosted at google sites

Hi,

Can I use membership to protect a subdomain of my network named intranet.mysite.com, that is a google site I use for our intranet? The subdomain has a CName record that points it to ghs.google.com (google apps for education)? Or does google sites override wordpress that overrrides membership settings?

Thanks in advance
cmccb